Science - Class 9
Topic outline
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NCERT Solutions for Class 9 Science- Matter in Our Surroundings (Chemistry), NCERT Textbook Solutions for Class 9 Science, NCERT Solutions For Class 9 Chemistry, Matter in Our Surroundings - Class 9th NCERT Solutions Science, NCERT Solutions For Class 9 Chemistry Science Chapter 1 - Matter in Our Surroundings, Science - Chemistry - Class 9 (CBSE/NCERT) - Chapter 1 – Matter in Our Surroundings – Questions and Answers/Notes/Worksheets Tags: CBSE Class 9 - Chemistry – Chapter 1 - Matter in Our Surroundings Practice Pages, Extra Question and Answer based on NCERT for Class 9th, Science Chemistry, CBSE Grade IX free Worksheets PDF Matter in Our Surroundings, Science Question bank on Matter in Our Surroundings for ninth standard, Matter in Our Surroundings class 9 questions answers, Fill in the blanks. a. ______ have a definite shape, distinct boundaries and fixed volumes. b. ________ have no fixed shape but have a fixed volume. c. The smell of perfume gradually spreads across a room due to _____. d. Heat required to change the state of a substance without changing its temperature is called __________. e. _________ is the SI unit of temperature. f. Solid carbon dioxide is also known as ___________. g. The chemical name of dry ice is _______________. h. When steam condenses to form water, heat is _______________. i. The fluorescent tube and neon sign bulbs consist of _________. j. Evaporation of a liquid at room temperature leads to a ______ effect. k. The phenomenon of change of a liquid into the gaseous state at any temperature below its boiling point is called _____________. Which one of the following sets of phenomena would increase on raising the temperature? (a) Diffusion, evaporation, compression of gases (b) Evaporation, compression of gases, solubility (c) Evaporation, diffusion, expansion of gases (d) Evaporation, solubility, diffusion, compression of gases. Seema visited a Natural Gas Compressing Unit and found that the gas can be liquefied under specific conditions of temperature and pressure. While sharing her experience with friends she got confused. Help her to identify the correct set of conditions. (a) Low temperature, low pressure (b) High temperature, low pressure (c) Low temperature, high pressure (d) High temperature, high pressure. The property to flow is unique to fluids. Which one of the following statements is correct? (a) Only gases behave like fluids. (b) Gases and solids behave like fluids. (c) Gases and liquids behave like fluids. (d) Only liquids are fluids. During summer, water kept in an earthen pot becomes cool because of the phenomenon of (a) diffusion (b) transpiration (c) osmosis (d) evaporation. A few substances are arranged in the increasing order of ‘forces of attraction’ between their particles. Which one of the following represents a correct arrangement? (a) Water, air, wind (b) Air, sugar, oil (c) Oxygen, water, sugar (d) Salt, juice, air. On converting 25°C, 38°C and 66°C to Kelvin scale, the correct sequence of temperature will be (a) 298 K, 311 K and 339 K (b) 298 K, 300 K and 338 K (c) 273 K, 278 K and 543 K (d) 298 K, 310 K and 338 K. Choose the correct statement of the following. (a) Conversion of solid into vapours without passing through the liquid state is called vapourisation. (b) Conversion of vapours into solid without passing through the liquid state is called sublimation. (c) Conversion of vapours into solid without passing through the liquid state is called freezing. (d) Conversion of solid into liquid is called sublimation. The boiling points of diethyl ether, acetone and n-butyl alcohol are 35°C, 56°C and 118°C respectively. Which one of the following correctly represents their boiling points in Kelvin scale? (a) 306 K, 329 K, 391 K (b) 308 K, 329 K, 392 K (c) 308 K, 329 K, 391 K (d) 329 K, 392 K, 308 K. Which condition out of the following will increase the evaporation of water? (a) Increase in temperature of water (b) Decrease in temperature of water (c) Less exposed surface area of water (d) Adding common salt to water. ln which of the following conditions, the distance between the molecules of hydrogen gas would increase? (i) Increasing pressure on hydrogen contained in a closed container. (ii) Some hydrogen gas leaking out of the container. (iii) Increasing the volume of the container of hydrogen gas. (iv) Adding more hydrogen gas to the container without increasing the volume of the container. (a) (i) and (iii) (b) (i) and (iv) (c) (ii) and (iii) (d) (ii)and(iv)Page: 1 Files: 3
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NCERT Solutions for Class 9 Science- Matter in Our Surroundings (Chemistry), NCERT Textbook Solutions for Class 9 Science, NCERT Solutions For Class 9 Chemistry, Matter in Our Surroundings - Class 9th NCERT Solutions Science, NCERT Solutions For Class 9 Chemistry Science Chapter 1 - Matter in Our Surroundings, Science - Chemistry - Class 9 (CBSE/NCERT) - Chapter 1 – Matter in Our Surroundings – Questions and Answers/Notes/Worksheets Tags: CBSE Class 9 - Chemistry – Chapter 1 - Matter in Our Surroundings Practice Pages, Extra Question and Answer based on NCERT for Class 9th, Science Chemistry, CBSE Grade IX free Worksheets PDF Matter in Our Surroundings, Science Question bank on Matter in Our Surroundings for ninth standard, Matter in Our Surroundings class 9 questions answers, Give the best evidence for motion of particles in matter. Which process provides the best evidence for the particle theory of matter? Which property of liquids and gases tells us that their molecules are moving constantly? Write the term that is used to describe the mixing of copper sulphate and water kept in a beaker, on its own? Name the phenomenon in which particles of two or more substances intermix on their own. Name two substances which undergo sublimation. Which of the following are matters? chair, air, love, smell, hate, almonds, thought, cold, cold drink, smell of perfume. Name the gas which is supplied in compressed form in homes. Name the gas which is supplied to hospitals in cylinders in compressed form. Which of the following is highly compressible? a. solids b. liquids c. gases. Suggest a method to liquefy atmospheric gases. What is the temperature at which a liquid changes into a gas? What is the temperature at which a solid changes into a liquid? Why are liquids called as fluid? The mass per unit volume of a substance is called density. (density = mass/volume). Arrange the following in order of increasing density – air, exhaust from chimneys, honey, water, chalk, cotton and iron. Write the full form of LPG and CNG. What is boiling point? What is melting point? Why boiling is considered a bulk phenomenon? Boiling is a bulk phenomenon. Explain. How can we change the physical states of matter? What are the Five States of Matter? Under what conditions heat can be given to a substance without raising its temperature?Page: 1 Files: 3
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NCERT Solutions for Class 9 Science- Matter in Our Surroundings (Chemistry), NCERT Textbook Solutions for Class 9 Science, NCERT Solutions For Class 9 Chemistry, Matter in Our Surroundings - Class 9th NCERT Solutions Science, NCERT Solutions For Class 9 Chemistry Science Chapter 1 - Matter in Our Surroundings, Science - Chemistry - Class 9 (CBSE/NCERT) - Chapter 1 – Matter in Our Surroundings – Questions and Answers/Notes/Worksheets Tags: CBSE Class 9 - Chemistry – Chapter 1 - Matter in Our Surroundings Practice Pages, Extra Question and Answer based on NCERT for Class 9th, Science Chemistry, CBSE Grade IX free Worksheets PDF Matter in Our Surroundings, Science Question bank on Matter in Our Surroundings for ninth standard, Matter in Our Surroundings class 9 questions answers, What is latent heat of vaporization? What is latent heat of fusion? Which of the two diffuses faster: a liquid or a gas? State the reason. What are the requirements of being matter? What are the conditions for something to be called matter? What are the essential conditions to be a matter? What type of clothes should we wear in summer? Sponge is a solid yet we are able to compress it. Why? Name one common substance which can be easily changed from one state to another by heating or cooling. What is Sublimation? Which property is shown by ammonium chloride but not by sodium chloride? Sugar and salt when kept in different jars take the shape of the jar. Are they solid? A rubber band can change its shape on stretching. Is it a solid? State any two characteristics of matter demonstrated by diffusion. When an incense stick (agarbatti) is lighted in one corner of a room, its fragrance spreads in the whole room quickly. What do you conclude from this observation? Why are solids rigid? What is the arrangement of particles in case of solids, liquids and gases? What happens to the particles when salt dissolves in water? ExplainPage: 1 Files: 3
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NCERT Solutions for Class 9 Science- Matter in Our Surroundings (Chemistry), NCERT Textbook Solutions for Class 9 Science, NCERT Solutions For Class 9 Chemistry, Matter in Our Surroundings - Class 9th NCERT Solutions Science, NCERT Solutions For Class 9 Chemistry Science Chapter 1 - Matter in Our Surroundings, Science - Chemistry - Class 9 (CBSE/NCERT) - Chapter 1 – Matter in Our Surroundings – Questions and Answers/Notes/Worksheets Tags: CBSE Class 9 - Chemistry – Chapter 1 - Matter in Our Surroundings Practice Pages, Extra Question and Answer based on NCERT for Class 9th, Science Chemistry, CBSE Grade IX free Worksheets PDF Matter in Our Surroundings, Science Question bank on Matter in Our Surroundings for ninth standard, Matter in Our Surroundings class 9 questions answers, A diver is able to cut through water in a swimming pool. Which property of matter does this observation show? Liquids generally have lower density as compared to solids. But you must have observed that ice floats on water. Find out why? Why is honey more viscous than water? What is meant by ‘diffusion’? Give one example of diffusion in gases. What does the diffusion of gases tell us about their particles? When salt is dissolved in water, there is no increase in the volume. Which characteristic of matter is illustrated by this observation? Why does the level of water not change when salt is dissolved? What is the physical state of water at: a. 250ºC b. 100ºC? Why does the temperature remain constant during the melting of ice even though heat is supplied continuously? Why does temperature remain constant during melting of ice? Which contains more heat energy, water at 100°C or steam at 100°C? Name the three states of matter. Give one example of each. Just a few crystals of potassium permanganate can colour a large volume of water (about 1000 L). Which characteristic of particles of matter is illustrated by this observation? Why does the temperature remain constant during the boiling of water even though heat is supplied continuously? Why does temperature remain constant during boiling of water?Page: 1 Files: 3
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NCERT Solutions for Class 9 Science- Matter in Our Surroundings (Chemistry), NCERT Textbook Solutions for Class 9 Science, NCERT Solutions For Class 9 Chemistry, Matter in Our Surroundings - Class 9th NCERT Solutions Science, NCERT Solutions For Class 9 Chemistry Science Chapter 1 - Matter in Our Surroundings, Science - Chemistry - Class 9 (CBSE/NCERT) - Chapter 1 – Matter in Our Surroundings – Questions and Answers/Notes/Worksheets Tags: CBSE Class 9 - Chemistry – Chapter 1 - Matter in Our Surroundings Practice Pages, Extra Question and Answer based on NCERT for Class 9th, Science Chemistry, CBSE Grade IX free Worksheets PDF Matter in Our Surroundings, Science Question bank on Matter in Our Surroundings for ninth standard, Matter in Our Surroundings class 9 questions answers, State any two characteristic properties of a gas. What are the main characteristics of a gas? What are the characteristics of gases? Convert the following temperatures to the Celsius scale. (a) 300 K (b) 573 K. Convert the following temperatures to the Kelvin scale. (a) 25°C (b) 373°C. What produces more severe burns, boiling water or steam? We come to know of what is being cooked in the kitchen without even entering there, by the smell that reaches our nostrils. How does this smell reach us? Give reasons for the following observation: The smell of hot sizzling food reaches you several metres away, but to get the smell from cold food you have to go close. Why is ice at 273 K more effective in cooling than water at the same temperature? Why does a desert cooler cool better on a hot dry day? How does the water kept in an earthen pot (matka) become cool during summer? Why is heat energy needed to melt a solid? What is this heat energy called? Why does our palm feel cold when we put some acetone or petrol or perfume on it? Why are we able to sip hot tea or milk faster from a saucer rather than a cup?Page: 1 Files: 3
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NCERT Solutions for Class 9 Science- Matter in Our Surroundings (Chemistry), NCERT Textbook Solutions for Class 9 Science, NCERT Solutions For Class 9 Chemistry, Matter in Our Surroundings - Class 9th NCERT Solutions Science, NCERT Solutions For Class 9 Chemistry Science Chapter 1 - Matter in Our Surroundings, Science - Chemistry - Class 9 (CBSE/NCERT) - Chapter 1 – Matter in Our Surroundings – Questions and Answers/Notes/Worksheets Tags: CBSE Class 9 - Chemistry – Chapter 1 - Matter in Our Surroundings Practice Pages, Extra Question and Answer based on NCERT for Class 9th, Science Chemistry, CBSE Grade IX free Worksheets PDF Matter in Our Surroundings, Science Question bank on Matter in Our Surroundings for ninth standard, Matter in Our Surroundings class 9 questions answers, What is matter? Give examples. What is the relation between Kelvin scale and Celsius scale of temperature? Why solid carbon dioxide is also known as dry ice? Why do gases have neither a fixed shape nor a fixed volume? When a crystal of copper sulphate is placed at the bottom of a beaker containing water, the water slowly turns blue even without stirring. Why? What is the physical state of water at - (a) 25°C (b) 0°C (c) 100°C. How does perspiration or sweating help keep our body cool on a hot day? Why do we feel cool after sweating? Explain how sweating helps to cool the body. For any substance, why does the temperature remain constant during the change of state? How can the evaporation of a liquid be made faster? How can we increase the rate of evaporation? What are the factors affecting evaporation?Page: 1 Files: 3
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NCERT Solutions for Class 9 Science- Matter in Our Surroundings (Chemistry), NCERT Textbook Solutions for Class 9 Science, NCERT Solutions For Class 9 Chemistry, Matter in Our Surroundings - Class 9th NCERT Solutions Science, NCERT Solutions For Class 9 Chemistry Science Chapter 1 - Matter in Our Surroundings, Science - Chemistry - Class 9 (CBSE/NCERT) - Chapter 1 – Matter in Our Surroundings – Questions and Answers/Notes/Worksheets Tags: CBSE Class 9 - Chemistry – Chapter 1 - Matter in Our Surroundings Practice Pages, Extra Question and Answer based on NCERT for Class 9th, Science Chemistry, CBSE Grade IX free Worksheets PDF Matter in Our Surroundings, Science Question bank on Matter in Our Surroundings for ninth standard, Matter in Our Surroundings class 9 questions answers, State any two characteristic properties of a liquid. What are the main characteristics of a liquid? What are the characteristics of liquids? Name two gases of air which dissolve in water by diffusion. What is the importance of this process in nature? What is the importance of diffusion of gases in water in nature? Why are gases so easily compressible whereas it is almost impossible to compress a solid or a liquid? A piece of chalk can be broken into small particles by hammering but a piece of iron cannot be broken into small particles by hammering. Why? What are the characteristics of the particles of matter? Give two reasons to justify— (a) water at room temperature is a liquid. (b) an iron almirah is a solid at room temperature. What happens when a crystal of potassium permanganate is dropped in a glass tumbler containing water? What conclusion can you draw? Arrange the following substances in increasing order of forces of attraction between the particles— water, sugar, oxygen. Among solids, liquids and gases, which one has: (a) maximum force of attraction between the particles? (b) minimum spaces in between particles? (c) maximum movement of particles?Page: 1 Files: 3
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NCERT Solutions for Class 9 Science- Matter in Our Surroundings (Chemistry), NCERT Textbook Solutions for Class 9 Science, NCERT Solutions For Class 9 Chemistry, Matter in Our Surroundings - Class 9th NCERT Solutions Science, NCERT Solutions For Class 9 Chemistry Science Chapter 1 - Matter in Our Surroundings, Science - Chemistry - Class 9 (CBSE/NCERT) - Chapter 1 – Matter in Our Surroundings – Questions and Answers/Notes/Worksheets Tags: CBSE Class 9 - Chemistry – Chapter 1 - Matter in Our Surroundings Practice Pages, Extra Question and Answer based on NCERT for Class 9th, Science Chemistry, CBSE Grade IX free Worksheets PDF Matter in Our Surroundings, Science Question bank on Matter in Our Surroundings for ninth standard, Matter in Our Surroundings class 9 questions answers, State any two characteristic properties of a solid. What are the main characteristics of a solid? What are the characteristics of solids? Draw a labelled diagram to show interconversion of the three states of matter. Draw a labeled diagram of the experimental set-up to study the latent heat of fusion of ice. Draw a labeled diagram of the experimental set-up to study the latent heat of vaporization of water. Draw a labeled diagram of the experimental set-up to demonstrate the sublimation of ammonium chloride. Give reason for the following observations. (a) Naphthalene balls disappear with time without leaving any solid. (b) We can get the smell of perfume sitting several metres away. Name A,B,C,D,E and F in the following diagram showing change in its state?Page: 1 Files: 3
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NCERT Solutions for Class 9 Science- Matter in Our Surroundings (Chemistry), NCERT Textbook Solutions for Class 9 Science, NCERT Solutions For Class 9 Chemistry, Matter in Our Surroundings - Class 9th NCERT Solutions Science, NCERT Solutions For Class 9 Chemistry Science Chapter 1 - Matter in Our Surroundings, Science - Chemistry - Class 9 (CBSE/NCERT) - Chapter 1 – Matter in Our Surroundings – Questions and Answers/Notes/Worksheets Tags: CBSE Class 9 - Chemistry – Chapter 1 - Matter in Our Surroundings Practice Pages, Extra Question and Answer based on NCERT for Class 9th, Science Chemistry, CBSE Grade IX free Worksheets PDF Matter in Our Surroundings, Science Question bank on Matter in Our Surroundings for ninth standard, Matter in Our Surroundings class 9 questions answers, Tabulate the differences in the characteristics of states of matter. Comment upon the following: rigidity, compressibility, fluidity, filling a gas container, shape, kinetic energy and density. Give reasons (a) A gas fills completely the vessel in which it is kept. (b) A gas exerts pressure on the walls of the container. (c) A wooden table should be called a solid. (d) We can easily move our hand in air but to do the same through a solid block of wood we need a karate expert.Page: 1 Files: 2
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NCERT Solutions for Class 9 Science- Is Matter Around Us Pure (Chemistry), NCERT Textbook Solutions for Class 9 Science, NCERT Solutions For Class 9 Chemistry, Is Matter Around Us Pure - Class 9th NCERT Solutions Science, NCERT Solutions For Class 9 Chemistry Science Chapter 2 - Is Matter Around Us Pure, Science - Chemistry - Class 9 (CBSE/NCERT) - Chapter 2 – Is Matter Around Us Pure – Questions and Answers/Notes/Worksheets, CBSE Class 9 - Chemistry – Chapter 2 - Is Matter Around Us Pure Practice Pages, Extra Question and Answer based on NCERT for Class 9th, Science Chemistry, CBSE Grade IX free Worksheets PDF Is Matter Around Us Pure exemplar question answer, NCERT Book question answer, Science Question bank on Is Matter Around Us Pure for ninth standard, Is Matter Around Us Pure, Which of the following statements are true for pure substances? (i) Pure substances contain only one kind of particles. (ii) Pure substances may be compounds or mixtures. (iii) Pure substances have the same composition throughout. (iv) Pure substances can be exemplified by all elements other than nickel. Rusting of an article made up of iron is called (a) corrosion and it is a physical as well as chemical change (b) dissolution and it is a physical change (c) corrosion and it is a chemical change (d) dissolution and it is a chemical change. A mixture of sulphur and carbon disulphide is (a) heterogeneous and shows Tyndall effect (b) homogeneous and shows Tyndall effect (c) heterogeneous and does not show Tyndall effect (d) homogeneous and does not show Tyndall effect. Tincture of iodine has antiseptic properties. This solution is made by dissolving (a) iodine in potassium iodide (b) iodine in Vaseline (c) iodine in water (d) iodine in alcohol. Which of the following are homogeneous in nature? (i) Ice (ii) Wood (iii) Soil (iv) Air. Which of the following are physical changes? (i) Melting of iron metal (ii) Rusting of iron (iii) Bending of an iron rod : (iv) Drawing a wire of iron metal. Which of the following are chemical changes? (i) Decaying of wood (ii) Burning of wood (iii) Sawing of wood (iv) Hammering of a nail into a piece of wood. Two substances, A and B were made to react to form a third substance, A2B according to the following reaction: 2A + B → A2B. Which of the following statements concerning this reaction are incorrect? (i) The product A2B shows the properties of substances A and B. (ii) The product will always have a fixed composition. (iii) The product so formed cannot be classified as a compound. (iv) The product so formed is an element. Two chemical species X and Y combine together to form a product P which contains both X and Y X+Y→ P X and Y cannot be broken down into simpler substances by simple chemical reactions. Which of the following concerning the species X, Y and P are correct? (i) P is a compound. (ii) X and Y are compound. (iii) X and Y are elements. (iv) P has a fixed composition. Which of the following will show “Tyndall effect”? (a) Salt solution (b) Milk (c) Copper sulphate solution (d) Starch solution. Q11. Salt can be recovered from its solution by evaporation. Suggest some other technique for the same? What is pure substance? What are the constituents of brass? Name the constituents elements of the alloy Brass. Classify the substances given in Fig. into elements and compounds.Page: 1
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NCERT Solutions for Class 9 Science- Is Matter Around Us Pure (Chemistry), NCERT Textbook Solutions for Class 9 Science, NCERT Solutions For Class 9 Chemistry, Is Matter Around Us Pure - Class 9th NCERT Solutions Science, NCERT Solutions For Class 9 Chemistry Science Chapter 2 - Is Matter Around Us Pure, Science - Chemistry - Class 9 (CBSE/NCERT) - Chapter 2 – Is Matter Around Us Pure – Questions and Answers/Notes/Worksheets, CBSE Class 9 - Chemistry – Chapter 2 - Is Matter Around Us Pure Practice Pages, Extra Question and Answer based on NCERT for Class 9th, Science Chemistry, CBSE Grade IX free Worksheets PDF Is Matter Around Us Pure exemplar question answer, NCERT Book question answer, Science Question bank on Is Matter Around Us Pure for ninth standard, Is Matter Around Us Pure, What are the types of pure substances? How matter is classified in terms of composition? What are the types of mixtures? How are elements further classified? Is dye in black ink a single colour? Justify your answer. What is meant by a pure substance? What is the principle of separating immiscible liquids using separating funnel? What type of liquid mixture will kerosene oil and water form? What happens when you mix water and kerosene? Identify the solutions among the following mixtures. (a) Soil (b) Sea water (c) Air (d) Coal (e) Soda water. What is meant by concentration of a solution? What is meant by solubility? Classify each of the following as a homogeneous or heterogeneous mixture. soda water, wood, air, soil, vinegar, filtered tea. Which of the following materials fall in the category of a “pure substance”? (a) Ice (b) Milk (c) Iron (d) Hydrochloric acid (e) Calcium oxide (f) Mercury (g) Brick (h) Wood (i) Air. Which method is used to obtain copper sulphate from an impure sample? What is tincture of iodine? Identify the solute and solvent in it. Define element. What is a mixture? Try segregating the things around you as pure substances or mixtures. What is an unsaturated solution? What do you mean by interconversion of states of matter? Out of colloid, solution and a suspension which one can be separated by filtration. What are metalloids? Give examples. Give an example of a solution in which solid is a solute as well as the solvent. Can we separate alcohol dissolved in water by using a separating funnel? If yes, then describe the procedure. If not, explain. Name the technique to separate (i) butter from curd, (ii) salt from sea-water, (iii) camphor from salt.Page: 1
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NCERT Solutions for Class 9 Science- Is Matter Around Us Pure (Chemistry), NCERT Textbook Solutions for Class 9 Science, NCERT Solutions For Class 9 Chemistry, Is Matter Around Us Pure - Class 9th NCERT Solutions Science, NCERT Solutions For Class 9 Chemistry Science Chapter 2 - Is Matter Around Us Pure, Science - Chemistry - Class 9 (CBSE/NCERT) - Chapter 2 – Is Matter Around Us Pure – Questions and Answers/Notes/Worksheets, CBSE Class 9 - Chemistry – Chapter 2 - Is Matter Around Us Pure Practice Pages, Extra Question and Answer based on NCERT for Class 9th, Science Chemistry, CBSE Grade IX free Worksheets PDF Is Matter Around Us Pure exemplar question answer, NCERT Book question answer, Science Question bank on Is Matter Around Us Pure for ninth standard, Is Matter Around Us Pure, Smoke and fog both are aerosols. In what way are they different? You are given two samples of water labelled as ‘A’ and ‘B’. Sample ‘A’ boils at 100°C and sample ‘B’ boils at 102°C. Which sample of water will not freeze at 0°C? Comment. What are the favourable qualities given to gold when it is alloyed with copper or silver for the purpose of making ornaments? Classify the following into elements, compounds and mixtures. (a) Sodium (b) Soil (c) Sugar solution (d) Silver (e) Calcium carbonate (f) Tin (g) Silicon (h) Coal (i) Air (j) Soap (k) Methane (l) Carbon dioxide (m) Blood. List any two applications of crystallization. How Tyndall effect can be observed in the canopy of a dense forest? What effect is observed when sunlight passes through the canopy of a dense forest? Explain. Which method is used to separate two miscible liquids? What types of mixtures are separated by the technique of crystallisation? The ‘sea-water’ can be classified as a homogeneous as well as heterogeneous mixture. Comment. List the two conditions essential for using distillation as a method for separation of the components from a mixture. Can we separate alcohol dissolved in water by using a separating funnel? If yes, then describe the procedure. If not, explain. Which of the tubes in Figure (a) and (b) will be more effective as a condenser in the distillation apparatus? Sucrose (sugar) crystals obtained from sugarcane and beetroot are mixed together. Will it be a pure substance or a mixture? Give reasons for the same. Give some examples of Tyndall effect observed in your surroundings? How would you confirm that a colourless liquid given to you is pure water? How do solution and gel differ from each other? Give one example for each. What is homogeneous mixture? Give examples.Page: 1
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NCERT Solutions for Class 9 Science- Is Matter Around Us Pure (Chemistry), NCERT Textbook Solutions for Class 9 Science, NCERT Solutions For Class 9 Chemistry, Is Matter Around Us Pure - Class 9th NCERT Solutions Science, NCERT Solutions For Class 9 Chemistry Science Chapter 2 - Is Matter Around Us Pure, Science - Chemistry - Class 9 (CBSE/NCERT) - Chapter 2 – Is Matter Around Us Pure – Questions and Answers/Notes/Worksheets, CBSE Class 9 - Chemistry – Chapter 2 - Is Matter Around Us Pure Practice Pages, Extra Question and Answer based on NCERT for Class 9th, Science Chemistry, CBSE Grade IX free Worksheets PDF Is Matter Around Us Pure exemplar question answer, NCERT Book question answer, Science Question bank on Is Matter Around Us Pure for ninth standard, Is Matter Around Us Pure, How are heterogeneous mixtures separated? What is heterogeneous mixture? Give examples. While diluting a solution of salt in water, a student by mistake added acetone (boiling point 56°C). What technique can be employed to get back the acetone? Justify your choice. How can you separate a mixture of oil and water? A child wanted to separate the mixture of dyes constituting a sample of ink. He marked a line by the ink on the filter paper and placed the filter paper in a glass containing water as shown in figure. The filter paper was removed when the water moved near the top of the filter paper. (a) What would you expect to see, if the ink contains three different coloured components? (b) Name the technique used by the child. (c) Suggest one more application of this technique. Classify the following as physical or chemical properties. (a) The composition of a sample of steel is 98% iron, 1.5% carbon and 0.5% other elements. (b) Zinc dissolves in hydrochloric acid with the evolution of hydrogen gas. (c) Metallic sodium is soft enough to be cut with a knife. (d) Most metal oxides form alkalis on interacting with water. Give an example each for the mixture having the following characteristics. Suggest a suitable method to separate the components of these mixtures. (a) A volatile and a non-volatile component. (b) Two volatile components with appreciable difference in boiling points. (c) Two immiscible liquids. (d) One of the components changes directly from solid to gaseous state. (e) Two or more coloured constituents soluble in some solvent. How is a separating funnel used in everyday life? Write any two application of separating funnel. Fill in the blanks. (a) A colloid is a _______ mixture and its components can be separated by the technique known as _______. (b) Ice, water and water vapour look different and display different _______ properties but they are _______ the same. (c) A mixture of chloroform and water taken in a separating funnel is mixed and left undisturbed for some time. The upper layer in the separating funnel will be of _______ and the lower layer will be that of _______. (d) A mixture of two or more miscible liquids, for which the difference in the boiling points is less than 25 K can be separated by the process called _______. (e) When light is passed through water containing a few drops of milk, it shows a bluish tinge. This is due to the _______ of light by milk and the phenomenon is called _______. This indicates that milk is a _______. Calculate the mass of sodium sulphate required to prepare its 20% (mass percent) solution in 100 g of water? Fractional distillation is suitable for separation of miscible liquids with a boiling point difference of about 25 K or less. What part of fractional distillation apparatus makes it efficient and possess an advantage over a simple distillation process? Explain using a diagram.Page: 1
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NCERT Solutions for Class 9 Science- Is Matter Around Us Pure (Chemistry), NCERT Textbook Solutions for Class 9 Science, NCERT Solutions For Class 9 Chemistry, Is Matter Around Us Pure - Class 9th NCERT Solutions Science, NCERT Solutions For Class 9 Chemistry Science Chapter 2 - Is Matter Around Us Pure, Science - Chemistry - Class 9 (CBSE/NCERT) - Chapter 2 – Is Matter Around Us Pure – Questions and Answers/Notes/Worksheets, CBSE Class 9 - Chemistry – Chapter 2 - Is Matter Around Us Pure Practice Pages, Extra Question and Answer based on NCERT for Class 9th, Science Chemistry, CBSE Grade IX free Worksheets PDF Is Matter Around Us Pure exemplar question answer, NCERT Book question answer, Science Question bank on Is Matter Around Us Pure for ninth standard, Is Matter Around Us Pure, How can we separate a mixture of salt and ammonium chloride? Why alloy is considered as a mixture? Why is an alloy a mixture? Write the principle and applications of separating funnel. (a) Under which category of mixtures will you classify alloys and why? (b) A solution is always a liquid. Comment. (c) Can a solution be heterogeneous? What is crystallization? Why is crystallization better than evaporation? What are the components of a Colloidal Solution? How can we obtain different gases from air? What is a concentration of a solution? You are provided with a mixture containing sand, iron filings, ammonium chloride and sodium chloride. Describe the procedures you would use to separate these constituents from the mixture? A group of students took an old shoe box and covered it with a black paper from all sides. They fixed a source of light (a torch) at one end of the box by making a hole in it and made another hole on the other side to view the light. They placed a milk sample contained in a beaker/tumbler in the box as shown in the Figure. They were amazed to see that milk taken in the tumbler was illuminated. They tried the same activity by taking a salt solution but found that light simply passed through it? (a) Explain why the milk sample was illuminated? Name the phenomenon involved. (b) Same results were not observed with a salt solution. Explain. (c) Can you suggest two more solutions which would show the same effect as shown by the milk solution? Differentiate between elements and compounds. Which of the following are chemical changes? (a) Growth of a plant (b) Rusting of iron (c) Mixing of iron filings and sand (d) Cooking of food (e) Digestion of food (f) Freezing of water (g) Burning of a candlePage: 1
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NCERT Solutions for Class 9 Science- Is Matter Around Us Pure (Chemistry), NCERT Textbook Solutions for Class 9 Science, NCERT Solutions For Class 9 Chemistry, Is Matter Around Us Pure - Class 9th NCERT Solutions Science, NCERT Solutions For Class 9 Chemistry Science Chapter 2 - Is Matter Around Us Pure, Science - Chemistry - Class 9 (CBSE/NCERT) - Chapter 2 – Is Matter Around Us Pure – Questions and Answers/Notes/Worksheets, CBSE Class 9 - Chemistry – Chapter 2 - Is Matter Around Us Pure Practice Pages, Extra Question and Answer based on NCERT for Class 9th, Science Chemistry, CBSE Grade IX free Worksheets PDF Is Matter Around Us Pure exemplar question answer, NCERT Book question answer, Science Question bank on Is Matter Around Us Pure for ninth standard, Is Matter Around Us Pure, How can we separate cream from milk? Non-metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured. (a) Name a lustrous non-metal. (b) Name a non-metal which exists as a liquid at room temperature. (c) The allotropic form of a non-metal is a good conductor of electricity. Name the allotrope. (d) Name a non-metal which is known to form the largest number of compounds. (e) Name a non-metal other than carbon which shows allotropy. (f) Name a non-metal which is required for combustion. Which of the following are not compounds? (a) Chlorine gas (b) Potassium chloride (c) Iron (d) Iron sulphide (e) Aluminium (f) Iodine (g) Carbon (h) Carbon monoxide (i) Sulphur powder. Arun has prepared 0.01% (by mass) solution of sodium chloride in water. Which of the following correctly represents the composition of the solutions? (a) 1.00 g of NaCl + 100 g of water (b) 0.11 g of NaCl + 100 g of water (c) 0.01 g of NaCl + 99.99 g of water (d) 0.10 g of NaCl + 99.90 g of water. What are the properties of non-metal? What is a solution? During an experiment the students were asked to prepare a 10% (mass/mass) solution of sugar in water. Ramesh dissolved 10 g of sugar in 100 g of water while Sarika prepared it by dissolving 10 g of sugar in water to make 100 g of the solution. (a) Are the two solutions of the same concentration? (b) Compare the mass % of the two solutions. Explain why particles of a colloidal solution do not settle down when left undisturbed, while in the case of a suspension they do. Write the steps you would use for making tea. Use the words solution, solvent, solute, dissolve, soluble, insoluble, filtrate and residue. On heating, calcium carbonate gets converted into calcium oxide and carbon dioxide. (a) Is this a physical or a chemical change? (b) Can you prepare one acidic and one basic solution by using the products formed in the above process? If so, write the chemical equation involved.Page: 1
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NCERT Solutions for Class 9 Science- Is Matter Around Us Pure (Chemistry), NCERT Textbook Solutions for Class 9 Science, NCERT Solutions For Class 9 Chemistry, Is Matter Around Us Pure - Class 9th NCERT Solutions Science, NCERT Solutions For Class 9 Chemistry Science Chapter 2 - Is Matter Around Us Pure, Science - Chemistry - Class 9 (CBSE/NCERT) - Chapter 2 – Is Matter Around Us Pure – Questions and Answers/Notes/Worksheets, CBSE Class 9 - Chemistry – Chapter 2 - Is Matter Around Us Pure Practice Pages, Extra Question and Answer based on NCERT for Class 9th, Science Chemistry, CBSE Grade IX free Worksheets PDF Is Matter Around Us Pure exemplar question answer, NCERT Book question answer, Science Question bank on Is Matter Around Us Pure for ninth standard, Is Matter Around Us Pure, Suggest separation technique(s) one would need to employ to separate the following mixtures. (a) Mercury and water (b) Potassium chloride and ammonium chloride (c) Common salt, water and sand (d) Kerosene oil, water and salt. A solution contains 40 ml of alcohol mixed with 120 ml of water. Calculate the concentration of this solution. The teacher instructed three students ‘A’, ‘B’ and ‘C’ respectively to prepare a 50% (mass by volume) solution of sodium hydroxide (NaOH). ‘A’ dissolved 50 g of NaOH in 100 mL of water, ‘B’ dissolved 50 g of NaOH in 100 g of water while ‘C’ dissolved 50 g of NaOH in water to make 100 ml of solution. Which one of them has made the desired solution and why? To make a saturated solution, 36 g of sodium chloride is dissolved in 100 g of water at 293 K. Find its concentration at this temperature. Differentiate between mixtures and compounds. State the properties of solution. What are the properties of solution? What are the characteristics of a solution? What would you observe when: (a) a saturated solution of potassium chloride prepared at 60°C is allowed to cool to room temperature (b) an aqueous sugar solution is heated to dryness (c) a mixture of iron filings and sulphur powder is heated strongly? How will you separate a mixture containing kerosene and petrol (difference in their boiling points is more than 25°C), which are miscible with each other?Page: 1
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NCERT Solutions for Class 9 Science- Is Matter Around Us Pure (Chemistry), NCERT Textbook Solutions for Class 9 Science, NCERT Solutions For Class 9 Chemistry, Is Matter Around Us Pure - Class 9th NCERT Solutions Science, NCERT Solutions For Class 9 Chemistry Science Chapter 2 - Is Matter Around Us Pure, Science - Chemistry - Class 9 (CBSE/NCERT) - Chapter 2 – Is Matter Around Us Pure – Questions and Answers/Notes/Worksheets, CBSE Class 9 - Chemistry – Chapter 2 - Is Matter Around Us Pure Practice Pages, Extra Question and Answer based on NCERT for Class 9th, Science Chemistry, CBSE Grade IX free Worksheets PDF Is Matter Around Us Pure exemplar question answer, NCERT Book question answer, Science Question bank on Is Matter Around Us Pure for ninth standard, Is Matter Around Us Pure, An element is sonorous and highly ductile. Under which category would you classify this element? What other characteristics do you expect the element to possess? ‘ Classify each of the following, as a physical or a chemical change. Give reasons. (a) Drying of a shirt in the sun. (b) Rising of hot air over a radiator. (c) Burning of kerosene in a lantern. (d) Change in the colour of black tea on adding lemon juice to it. (e) Churning of milk cream to get butter. How can we obtain pure copper sulphate from an impure sample? What is a suspension? Write its properties. What are the properties of suspension? What is the principle of centrifugation write its application? How can we obtain coloured component (dye) from blue/black ink? How can we separate a mixture of two immiscible liquids? How will you separate a mixture of kerosene oil and water? Name the process associated with the following: (a) Dry ice is kept at room temperature and at one atmospheric pressure. (b) A drop of ink placed on the surface of water contained in a glass spreads throughout the water. (c) A potassium permanganate crystal is in a beaker and water is poured into the beaker with stirring. (d) An acetone bottle is left open and the bottle becomes empty. (e) Milk is churned to separate cream from it. (f) Settling of sand when a mixture of sand and water is left undisturbed for some time. (g) Fine beam of light entering through a small hole in a dark room, illuminates the particles in its paths. What do you mean by solute and solvent? Explain with the help of examples. Classify the following as chemical or physical changes: • cutting of trees, • melting of butter in a pan, • rusting of almirah, • boiling of water to form steam, • passing of electric current, through water and the water breaking down into hydrogen and oxygen gases, • dissolving common salt in water, • making a fruit salad with raw fruits, and • burning of paper and wood.Page: 1
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NCERT Solutions for Class 9 Science- Is Matter Around Us Pure (Chemistry), NCERT Textbook Solutions for Class 9 Science, NCERT Solutions For Class 9 Chemistry, Is Matter Around Us Pure - Class 9th NCERT Solutions Science, NCERT Solutions For Class 9 Chemistry Science Chapter 2 - Is Matter Around Us Pure, Science - Chemistry - Class 9 (CBSE/NCERT) - Chapter 2 – Is Matter Around Us Pure – Questions and Answers/Notes/Worksheets, CBSE Class 9 - Chemistry – Chapter 2 - Is Matter Around Us Pure Practice Pages, Extra Question and Answer based on NCERT for Class 9th, Science Chemistry, CBSE Grade IX free Worksheets PDF Is Matter Around Us Pure exemplar question answer, NCERT Book question answer, Science Question bank on Is Matter Around Us Pure for ninth standard, Is Matter Around Us Pure, Which separation techniques will you apply for the separation of the following? (a) Sodium chloride from its solution in water. (b) Ammonium chloride from a mixture containing sodium chloride and ammonium chloride. (c) Small pieces of metal in the engine oil of a car. (d) Different pigments from an extract of flower petals. (e) Butter from curd. (f) Oil from water. (g) Tea leaves from tea. (h) Iron pins from sand. (i) Wheat grains from husk. (j) Fine mud particles suspended in water. Pragya tested the solubility of three different substances at different temperatures and collected the data as given below (results are given in the following table, as grams of substance dissolved in 100 grams of water to form a saturated solution). (a) What mass of potassium nitrate would be needed to produce a saturated solution of potassium nitrate in 50 grams of water at 313 K? (b) Pragya makes a saturated solution of potassium chloride in water at 353 K and leaves the solution to cool at room temperature. What would she observe as the solution cools? Explain. (c) Find the solubility of each salt at 293 K. Which salt has the highest solubility at this temperature? (d) What is the effect of change of temperature on the solubility of a salt? Explain the following giving examples. (a) saturated solution (b) pure substance (c) colloid (d) suspension. What is a colloid? Write its properties. List the points of differences between homogeneous and heterogeneous mixtures. Differentiate between homogeneous and heterogeneous mixtures with examples. How are sol, solution and suspension different from each other?Page: 1
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NCERT Solutions for Class 9 Science- Atoms And Molecules (Chemistry), NCERT Textbook Solutions for Class 9 Science, NCERT Solutions For Class 9 Chemistry, Atoms And Molecules - Class 9th NCERT Solutions Science, NCERT Solutions For Class 9 Chemistry Science Chapter 3 - Atoms And Molecules, Science - Chemistry - Class 9 (CBSE/NCERT) - Chapter 3 – Atoms And Molecules – Questions and Answers/Notes/Worksheets, CBSE Class 9 - Chemistry – Chapter 3 - Atoms And Molecules Practice Pages, Extra Question and Answer based on NCERT for Class 9th, Science Chemistry, CBSE Grade IX free Worksheets PDF Atoms And Molecules exemplar question answer, NCERT Book question answer, Science Question bank on Atoms And Molecules for ninth standard, Atoms And Molecules, Chemical symbol of sodium is Na. What is its Latin name? Name the scientist who gave atomic theory of matter. What are the building blocks of matter? Write the full form of IUPAC. Name the scientist who gave law of conservation of mass. Name the scientist who gave law of constant proportions. What does the symbol ‘u’ represent? A change in the physical state can be brought about (a) only when energy is given to the system (b) only when energy is taken out from the system (c) when energy is either given to, or taken out from the system (d) without any energy change. Why are Dalton's symbols not used in chemistry? What were the problems with Dalton's element symbols? What is atomicity? The chemical symbol for nitrogen gas is (a) Ni (b) N2 (c) N+ (d) N. The chemical symbol for sodium is (a) So (b) Sd (c) NA (d) Na. What is an atom? State the ‘law of conservation of mass.’ Who gave the name Parmanu to the smallest particle of matter? What is the difference between 2H and H2? Write any 2 laws of chemical combination. What was the basis for the Dalton's atomic theory? What formed the basis for John Dalton to formulate Dalton's atomic theory? What theory did Dalton propose about the structure of matter? Which part of the Dalton’s atomic theory came from the law of constant proportions given by Proust? What is meant by the term chemical formula? How many atoms are present in a (i) H2S molecule and (ii) PO43– ion? Mass of one atom of oxygen is. Calculate the number of moles of magnesium present in a magnesium ribbon weighing 12 g. Molar atomic mass of magnesium is 24g mol–1. Define the atomic mass unit. Why is it not possible to see an atom with naked eyes? The visible universe is estimated to contain 1022 stars. How many moles of stars are present in the visible universe? Does the solubility of a substance change with temperature? Explain with the help of an example. What is mole? What are polyatomic ions? Give examples. How the size of atoms is measured? Write the relation between nanometer and metre. How big are atoms? What is molecular mass? Hydrogen and oxygen combine in the ratio of 1:8 by mass to form water. What mass of oxygen gas would be required to react completely with 3 g of hydrogen gas? Write the molecular formulae of all the compounds that can be formed by the combination of following ions Cu2+, Na+, Fe3+, Cl–, SO42- , PO43-. A sample of vitamic C is known to contain 2.58 ×1024 oxygen atoms. How many moles of oxygen atoms are present in the sample? Compute the number of ions present in 5.85 g of sodium chloride.div>Page: 1
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NCERT Solutions for Class 9 Science- Atoms And Molecules (Chemistry), NCERT Textbook Solutions for Class 9 Science, NCERT Solutions For Class 9 Chemistry, Atoms And Molecules - Class 9th NCERT Solutions Science, NCERT Solutions For Class 9 Chemistry Science Chapter 3 - Atoms And Molecules, Science - Chemistry - Class 9 (CBSE/NCERT) - Chapter 3 – Atoms And Molecules – Questions and Answers/Notes/Worksheets, CBSE Class 9 - Chemistry – Chapter 3 - Atoms And Molecules Practice Pages, Extra Question and Answer based on NCERT for Class 9th, Science Chemistry, CBSE Grade IX free Worksheets PDF Atoms And Molecules exemplar question answer, NCERT Book question answer, Science Question bank on Atoms And Molecules for ninth standard, Atoms And Molecules, Give the names of the elements present in the following compounds. (a) Quick lime (b) Hydrogen bromide (c) Baking powder (d) Potassium sulphate. Compute the difference in masses of 103 moles each of magnesium atoms and magnesium ions. (Mass of an electron = 9.1×10–31 kg) You are provided with a fine white coloured powder which is either sugar or salt. How would you identify it without tasting? Which postulate of Dalton’s atomic theory can explain the law of definite proportions? State the number of atoms present in each of the following chemical species (a) CO32–, (b) PO43–, (c) P2O5, (d) CO, Which of the following represents a correct chemical formula? Name it. (a) CaCl (b) BiPO4 (c) NaSO4 (d) NaS, Write the cations and anions present (if any) in the following compounds (a) CH3COONa, (b) NaCl, (c) H2, (d) NH4NO3, Which postulate of Dalton’s atomic theory is the result of the law of conservation of mass? Raunak took 5 moles of carbon atoms in a container and Krish also took 5 moles of sodium atoms in another container of same weight. (a) Whose container is heavier? (b) Whose container has more number of atoms? Write the chemical formulae of the following. (a) Magnesium chloride, (b) Calcium oxide, (c) Copper nitrate, (d) Aluminium chloride, (e) Calcium carbonate, Which of the following symbols of elements are incorrect? Give their correct symbols (a) Cobalt CO, (b) Carbon c, (c) Aluminium AL, (d) Helium He, (e) Sodium So, Classify each of the following on the basis of their atomicity. (a) F2 (b) NO2 (c) N2O (d) C2H6 (e) P4 (f) H2O2 (g) P4O10 (H) O3 (i) HCl (j) CH4 (k) He (l) Ag, What is the SI prefix for each of the following multiples and submultiples of a unit? (a) 103 (b) 10–1 (c) 10–2 (d) 10–6 (e) 10–9 (f) 10–12 ,Write down the names of compounds represented by the following formulae: (i) Al2(SO4)3 (ii) CaCl2 (iii) K2SO4 (iv) KNO3 (v) CaCO3, Calcium chloride when dissolved in water dissociates into its ions according to the following equation. CaCl2 (aq) > Ca2+ (aq) + 2Cl– (aq) Calculate the number of ions obtained from CaCl2 when 222 g of it is dissolved in water. If one mole of carbon atoms weighs 12 gram, what is the mass (in gram) of 1 atom of carbon? When 3.0 g of carbon is burnt in 8.00 g oxygen, 11.00 g of carbon dioxide is produced. What mass of carbon dioxide will be formed when 3.00 g of carbon is burnt in 50.00 g of oxygen? Which law of chemical combination will govern your answer? The mass of one steel screw is 4.11g. Find the mass of one mole of these steel screws. Compare this value with the mass of the Earth (5.98 × 1024kg). Which one of the two is heavier and by how many times? div>Page: 1
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NCERT Solutions for Class 9 Science- Atoms And Molecules (Chemistry), NCERT Textbook Solutions for Class 9 Science, NCERT Solutions For Class 9 Chemistry, Atoms And Molecules - Class 9th NCERT Solutions Science, NCERT Solutions For Class 9 Chemistry Science Chapter 3 - Atoms And Molecules, Science - Chemistry - Class 9 (CBSE/NCERT) - Chapter 3 – Atoms And Molecules – Questions and Answers/Notes/Worksheets, CBSE Class 9 - Chemistry – Chapter 3 - Atoms And Molecules Practice Pages, Extra Question and Answer based on NCERT for Class 9th, Science Chemistry, CBSE Grade IX free Worksheets PDF Atoms And Molecules exemplar question answer, NCERT Book question answer, Science Question bank on Atoms And Molecules for ninth standard, Atoms And Molecules, What is Avogadro Constant or Avogadro Number? What is the relationship between a mole and Avogadro’s Number? What is an ion? Explain with the help of example. A 0.24 g sample of compound of oxygen and boron was found by analysis to contain 0.096 g of boron and 0.144 g of oxygen. Calculate the percentage composition of the compound by weight. A gold sample contains 90% of gold and the rest copper. How many atoms of gold are present in one gram of this sample of gold? Express each of the following in kilograms (a) 5.84×10-3 mg (b) 58.34 g (c) 0.584g (d) 5.873×10-21g, The difference in the mass of 100 moles each of sodium atoms and sodium ions is 5.48002 g. Compute the mass of an electron. Write the molecular formulae for the following compounds (a) Copper (II) bromide, (b) Aluminium (III) nitrate, (c) Calcium (II) phosphate, (d) Iron (III) sulphide, (e) Mercury (II) chloride, (f) Magnesium (II) acetate, Give the formulae of the compounds formed from the following sets of elements (a) Calcium and fluorine (b) Hydrogen and Sulphur (c) Nitrogen and hydrogen (d) Carbon and chlorine (e) Sodium and oxygen (f) Carbon and oxygen, (a) In a chemical reaction, the sum of the masses of the reactants and products remains unchanged. This is called ————. (b) A group of atoms carrying a fixed charge on them is called ————. (c) The formula unit mass of Ca3 (PO4)2 is ————. (d) Formula of sodium carbonate is ———— and that of ammonium sulphate is ————. Give the chemical formulae for the following compounds and compute the ratio by mass of the combining elements in each one of them. (You may use appendix-III). (a) Ammonia (b) Carbon monoxide (c) Hydrogen chloride (d) Aluminium fluoride (e) Magnesium sulphide, Calculate the number of molecules of sulphur (S8) present in 16 g of solid sulphur. Which of the following correctly represents 360 g of water? (i) 2 moles of H20 (ii) 20 moles of water (iii) 6.022 × 1023 molecules of water (iv) 1.2044×1025 molecules of water (a) (i) (b) (i) and (iv) (c) (ii) and (iii) (d) (ii) and (iv) What is the mass of: (a) 0.2 mole of oxygen atoms? (b) 0.5 mole of water molecules? What is the mass of— (a) 1 mole of nitrogen atoms? (b) 4 moles of aluminium atoms (Atomic mass of aluminium = 27)? (c) 10 moles of sodium sulphite (Na2SO3)?div>Page: 1
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NCERT Solutions for Class 9 Science- Atoms And Molecules (Chemistry), NCERT Textbook Solutions for Class 9 Science, NCERT Solutions For Class 9 Chemistry, Atoms And Molecules - Class 9th NCERT Solutions Science, NCERT Solutions For Class 9 Chemistry Science Chapter 3 - Atoms And Molecules, Science - Chemistry - Class 9 (CBSE/NCERT) - Chapter 3 – Atoms And Molecules – Questions and Answers/Notes/Worksheets, CBSE Class 9 - Chemistry – Chapter 3 - Atoms And Molecules Practice Pages, Extra Question and Answer based on NCERT for Class 9th, Science Chemistry, CBSE Grade IX free Worksheets PDF Atoms And Molecules exemplar question answer, NCERT Book question answer, Science Question bank on Atoms And Molecules for ninth standard, Atoms And Molecules, Cinnabar (HgS) is a prominent ore of mercury. How many grams of mercury are present in 225 g of pure HgS? Molar mass of Hg and S are 200.6 g mol–1 and 32 g mol–1 respectively. Calculate the molar mass of the following substances. (a) Ethyne, C2H2 (b) Sulphur molecule, S8 (c) Phosphorus molecule, P4 (Atomic mass of phosphorus = 31) (d) Hydrochloric acid, HCl (e) Nitric acid, HNO3, Calculate the number of aluminium ions present in 0.051 g of aluminium oxide. Calculate the formula unit masses of ZnO, Na2O, K2CO3, given atomic masses of Zn = 65 u, Na = 23 u, K = 39 u, C = 12 u, and O = 16 u. Which has more number of atoms? 100g of N2 or 100 g of NH3, What are the postulates of Dalton's atomic theory? State the law of constant proportions. Give one example to illustrate this law. Explain giving a suitable example: Law of constant proportion. How can you say the law of constant proportion is a valid justify with an example? In a reaction, 5.3 g of sodium carbonate reacted with 6 g of ethanoic acid. The products were 2.2 g of carbon dioxide, 0.9 g water and 8.2 g of sodium ethanoate. Show that these observations are in agreement with the law of conservation of mass. sodium carbonate + ethanoic acid → sodium ethanoate + carbon dioxide + water, How do elements get their names and symbols? Calculate the molecular masses of H2, O2, Cl2, CO2, CH4, C2H6, C2H4, NH3, CH3OH. div>Page: 1
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NCERT Solutions for Class 9 Science- Atoms And Molecules (Chemistry), NCERT Textbook Solutions for Class 9 Science, NCERT Solutions For Class 9 Chemistry, Atoms And Molecules - Class 9th NCERT Solutions Science, NCERT Solutions For Class 9 Chemistry Science Chapter 3 - Atoms And Molecules, Science - Chemistry - Class 9 (CBSE/NCERT) - Chapter 3 – Atoms And Molecules – Questions and Answers/Notes/Worksheets, CBSE Class 9 - Chemistry – Chapter 3 - Atoms And Molecules Practice Pages, Extra Question and Answer based on NCERT for Class 9th, Science Chemistry, CBSE Grade IX free Worksheets PDF Atoms And Molecules exemplar question answer, NCERT Book question answer, Science Question bank on Atoms And Molecules for ninth standard, Atoms And Molecules, Convert into mole. (a) 12 g of oxygen gas (b) 20 g of water (c) 22 g of carbon dioxide. Which has more number of atoms, 100 grams of sodium or 100 grams of iron (given, atomic mass of Na = 23 u, Fe = 56 u)? Which of the following statements is not true about an atom? (a) Atoms are not able to exist independently (b) Atoms are the basic units from which molecules and ions are formed (c) Atoms are always neutral in nature (d) Atoms aggregate in large numbers to form the matter that we can see, feel or touch, Which of the following would weigh the highest? (a) 0.2 mole of sucrose (C12 H22 O11) (b) 2 moles of CO2 (c) 2 moles of CaCO3 (d) 10 moles of H2O, Which of the following has maximum number of atoms? (a) 18g of H2O (b) 18g of O2 (c) 18g of CO2 (d) 18g of CH4 Which of the following contains maximum number of molecules? (a) 1g CO2 (b) 1g N2 (c) 1g H2 (d) 1g CH4, 3.42 g of sucrose are dissolved in 18g of water in a beaker. The number of oxygen atoms in the solution are (a) 6.68 × 1023 (b) 6.09 × 1022 (c) 6.022 × 1023 (d) 6.022 × 1021, Verify by calculating that (a) 5 moles of CO2 and 5 moles of H2O do not have the same mass. (b) 240 g of calcium and 240 g magnesium elements have a mole ratio of 3:5. Find the ratio by mass of the combining elements in the following compounds. (a) CaCO3 (d) C2H5OH (b) MgCl2 (e) NH3 (c) H2SO4 (f) Ca(OH)2Page: 1
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NCERT Solutions for Class 9 Science- Structure Of The Atom (Chemistry), NCERT Textbook Solutions for Class 9 Science, NCERT Solutions For Class 9 Chemistry, Structure Of The Atom - Class 9th NCERT Solutions Science, NCERT Solutions For Class 9 Chemistry Science Chapter 4 - Structure Of The Atom, Science - Chemistry - Class 9 (CBSE/NCERT) - Chapter 4 – Structure Of The Atom – Questions and Answers/Notes/Worksheets, CBSE Class 9 - Chemistry – Chapter 4 - Structure Of The Atom Practice Pages, Extra Question and Answer based on NCERT for Class 9th, Science Chemistry, CBSE Grade IX free Worksheets PDF Structure Of The Atom exemplar question answer, NCERT Book question answer, Science Question bank on Structure Of The Atom for ninth standard, Structure Of The Atom, Elements with valency 1 are (a) always metals (b) always metalloids (c) either metals or non-metals (d) always non-metals. The first model of an atom was given by (a) N. Bohr (b) E. Goldstein (c) Rutherford (d) J.J. Thomson. Rutherford’s alpha-particle scattering experiment was responsible for the discovery of (a) Atomic Nucleus (b) Electron (c) Proton (d) Neutron. Isotopes of an element have (a) the same physical properties (b) different chemical properties (c) different number of neutrons (d) different atomic numbers. Which of the following are true for an element? (i) Atomic number = number of protons + number of electrons (ii) Mass number = number of protons + number of neutrons (iii) Atomic number = number of protons = number of neutrons (iv) Atomic number = number of protons = number of electrons (a) (i) and (ii) (b) (i) and (iii) (c) (ii) and (iii) (d) (ii) and (iv). Atomic models have been improved over the years. Arrange the following atomic models in the order of their chronological order (i) Rutherford’s atomic model (ii) Thomson’s atomic model (iii) Bohr’s atomic model (a) (i), (ii) and (iii) (b) (ii), (iii) and (i) (c) (ii), (i) and (iii) (d) (iii), (ii) and (i). Is it possible for the atom of an element to have one electron, one proton and no neutron? If so, name the element. If bromine atom is available in the form of, say, two isotopes (_35^79)Br (49.7%) and (_35^81)Br (50.3%), calculate the average atomic mass of bromine atom.The electron distribution in an aluminium atom is (a) 2,8,3 (b) 2,8,2 (c) 8,2,3 (d) 2,3,8. The atomic number of calcium and argon are 20 and 18 respectively, but the mass number of both these elements is 40. What is the name given to such a pair of elements? Name the three sub-atomic particles of an atom. In the atom of an element X, 6 electrons are present in the outermost shell. If it acquires noble gas configuration by accepting requisite number of electrons, then what would be the charge on the ion so formed? Why did Rutherford select a gold foil in his α-ray scattering experiment? If Z = 3, what would be the valency of the element? Also, name the element. On the basis of Rutherford’s model of an atom, which subatomic particle is present in the nucleus of an atom? One electron is present in the outermost shell of the atom of an element X. What would be the nature and value of charge on the ion formed if this electron is removed from the outermost shell? Which one of the following is a correct electronic configuration of sodium? (a) 2,8 (b) 8,2,1 (c) 2,1,8 (d) 2,8,1. Which of the following correctly represent the electronic distribution in the Mg atom? (a) 3, 8, 1 (b) 2, 8, 2 (c) 1, 8, 3 (d) 8, 2, 2. An atom with 3 protons and 4 neutrons will have a valency of (a) 3 (b) 7 (c) 1 (d) 4 Which of the following statement is always correct? (a) An atom has equal number of electrons and protons. (b) An atom has equal number of electrons and neutrons. (c) An atom has equal number of protons and neutrons. (d) An atom has equal number of electrons, protons and neutrons. Calculate the number of neutrons present in the nucleus of an element X which is represented (_15^31) X. Rutherford’s alpha (α) particles scattering experiment resulted into discovery of (a) electron (b) proton (c) nucleus in the atom (d) atomic mass, If an atom contains one electron and one proton, will it carry any charge or not? What do you think would be the observation if the α-particle scattering experiment is carried out using a foil of a metal other than gold? Dalton’s atomic theory successfully explained. (i) Law of conservation of mass (ii) Law of constant composition (iii) Law of radioactivity (iv) Law of multiple proportion (a) (i), (ii) and (iii) (b) (i), (iii) and (iv) (c) (ii), (iii) and (iv) (d) (i), (ii) and (iv). Complete the table on the basis of information available in the symbols given below.Page: 1
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NCERT Solutions for Class 9 Science- Structure Of The Atom (Chemistry), NCERT Textbook Solutions for Class 9 Science, NCERT Solutions For Class 9 Chemistry, Structure Of The Atom - Class 9th NCERT Solutions Science, NCERT Solutions For Class 9 Chemistry Science Chapter 4 - Structure Of The Atom, Science - Chemistry - Class 9 (CBSE/NCERT) - Chapter 4 – Structure Of The Atom – Questions and Answers/Notes/Worksheets, CBSE Class 9 - Chemistry – Chapter 4 - Structure Of The Atom Practice Pages, Extra Question and Answer based on NCERT for Class 9th, Science Chemistry, CBSE Grade IX free Worksheets PDF Structure Of The Atom exemplar question answer, NCERT Book question answer, Science Question bank on Structure Of The Atom for ninth standard, Structure Of The Atom, Number of valence electrons in Cl– ion are: (a) 16 (b) 8 (c) 17 (d) 18, Write down the electron distribution of chlorine atom. How many electrons are there in the L shell? (Atomic number of chlorine is 17), Which of the following statements about Rutherford’s model of atom are correct? (i) Considered the nucleus as positively charged. (ii) Established that the a-particles are four times as heavy as a hydrogen atom. (iii) Can be compared to solar system. (iv) Was in agreement with Thomson’s model. (a) (i) and (iii) (b) (ii) and (iii) (c) (i) and (iv) (d) Only (i), In response to a question, a student stated that in an atom, the number of protons is greater than the number of neutrons, which in turn is greater than the number of electrons. Do you agree with the statement? Justify your answer. Will 35Cl and 37Cl have different valencies? Justify your answer. For the following statements, write T for True and F for False. (a) J.J. Thomson proposed that the nucleus of an atom contains only nucleons. (b) A neutron is formed by an electron and a proton combining together. Therefore, it is neutral. (c) The mass of an electron is about 1/2000 times that of proton. (d) An isotope of iodine is used for making tincture iodine, which is used as a medicine. Fill in the blanks in the following statements. (a) Rutherford’s a-particle scattering experiment led to the discovery of the_____. (b) Isotopes have same ______ but different ______. (c) Neon and chlorine have atomic numbers 10 and 17 respectively. Their valencies will be______ and _______ respectively. The electronic configuration of silicon is _____ and that of sulphur is______. For the symbol H, D and T tabulate three sub-atomic particles found in each of them. Draw a sketch of Bohr’s model of an atom with three shells. What are canal rays? Na+ has completely filled K and L shells. Explain. Helium atom has 2 electrons in its valence shell but its valency is not 2. Explain. On the basis of Thomson’s model of an atom, explain how the atom is neutral as a whole. Find out the valency of the atoms represented by the Fig. (a) and (b). In a sample of ethyl ethanoate (CH3COOC2H5) the two oxygen atoms have the same number of electrons but different number of neutrons. Which of the following is the correct reason for it? (a) One of the oxygen atoms has gained electrons. (b) One of the oxygen atoms has gained two neutrons. (c) The two oxygen atoms are isotopes. (d) The two oxygen atoms are isobars. Why do Helium, Neon and Argon have a zero valency? Composition of the nuclei of two atomic species X and Y are given as under, Give the mass numbers of X and Y. What is the relation between the two species? An element X has a mass number 4 and atomic number 2. Write the valency of this element? The average atomic mass of a sample of an element X is 16.2 u. What are the percentages of isotopes (_8^16) X and (_8^18) X in the sample?Page: 1
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NCERT Solutions for Class 9 Science- Structure Of The Atom (Chemistry), NCERT Textbook Solutions for Class 9 Science, NCERT Solutions For Class 9 Chemistry, Structure Of The Atom - Class 9th NCERT Solutions Science, NCERT Solutions For Class 9 Chemistry Science Chapter 4 - Structure Of The Atom, Science - Chemistry - Class 9 (CBSE/NCERT) - Chapter 4 – Structure Of The Atom – Questions and Answers/Notes/Worksheets, CBSE Class 9 - Chemistry – Chapter 4 - Structure Of The Atom Practice Pages, Extra Question and Answer based on NCERT for Class 9th, Science Chemistry, CBSE Grade IX free Worksheets PDF Structure Of The Atom exemplar question answer, NCERT Book question answer, Science Question bank on Structure Of The Atom for ninth standard, Structure Of The Atom, In the Thomson’s model of atom, which of the following statements are correct? (i) The mass of the atom is assumed to be uniformly distributed over the atom. (ii) The positive charge is assumed to be uniformly distributed over the atom. (iii) The electrons are uniformly distributed in the positively charged sphere. (iv) The electrons attract each other to stabilise the atom. (a) (i), (ii) and (iii) (b) (i) and (iii) (c) (i) and (iv) (d) (i), (iii) and (iv), If K and L shells of an atom are full, then what would be the total number of electrons in the atom? Write the electronic configuration of any one pair of isotopes and isobars. If number of electrons in an atom is 8 and number of protons is also 8, then (i) what is the atomic number of the atom? and (ii) what is the charge on the atom? Helium atom has an atomic mass of 4 u and two protons in its nucleus. How many neutrons does it have? The number of electrons in an element X is 15 and the number of neutrons is 16. Which of the following is the correct representation of the element? What information do you get from the figure about the atomic number, mass number and valency of atoms X, Y and Z? Give your answer in a tabular form. Which of the following in Fig. do not represent Bohr’s model of an atom correctly? (a) (i) and (ii) (b) (ii) and (iii) (c) (ii) and (iv) (d) (i) and (iv), Rutherford’s α-particle scattering experiment showed that (i) Electrons have negative charge. (ii) The mass and positive charge of the atom is concentrated in the nucleus. (iii) Neutron exists in the nucleus. (iv) Most of the space in atom is empty. Which of the above statements are correct? (a) (i) and (iii) (b) (ii) and (iv) (c) (i) and (iv) (d) (iii) and (iv) Find out the mass number of oxygen and sulphur atom. What are the limitations of Rutherford’s model of the atom? What were the drawbacks of Rutherford’s model of an atom? Define valency by taking examples of silicon and oxygen. Write any two observations which support the fact that atoms are divisible.Page: 1
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NCERT Solutions for Class 9 Science- Structure Of The Atom (Chemistry), NCERT Textbook Solutions for Class 9 Science, NCERT Solutions For Class 9 Chemistry, Structure Of The Atom - Class 9th NCERT Solutions Science, NCERT Solutions For Class 9 Chemistry Science Chapter 4 - Structure Of The Atom, Science - Chemistry - Class 9 (CBSE/NCERT) - Chapter 4 – Structure Of The Atom – Questions and Answers/Notes/Worksheets, CBSE Class 9 - Chemistry – Chapter 4 - Structure Of The Atom Practice Pages, Extra Question and Answer based on NCERT for Class 9th, Science Chemistry, CBSE Grade IX free Worksheets PDF Structure Of The Atom exemplar question answer, NCERT Book question answer, Science Question bank on Structure Of The Atom for ninth standard, Structure Of The Atom, . In the Gold foil experiment of Geiger and Marsden, that paved the way for Rutherford’s model of an atom, ~ 1.00% of the α-particles were found to deflect at angles > 50°. If one mole of a-particles were bombarded on the gold foil, compute the number of α-particles that would deflect at angles less than 50°. The ion of an element has 3 positive charges. Mass number of the atom is 27 and the number of neutrons is 14. What is the number of electrons in the ion? (a) 13 (b) 10 (c) 14 (d) 16, Compare the properties of electrons, protons and neutrons. What are the limitations of J.J. Thomson’s model of the atom? Write the distribution of electrons in carbon and sodium atoms. Describe Bohr’s model of the atom. Show diagrammatically the electron distributions in a sodium atom and a sodium ion and also give their atomic number. Identify the Mg2+ ion from the figure where, n and p represent the number of neutrons and protons respectively. What are the postulates of Bohr’s model of an atom? Enlist the conclusions drawn by Rutherford from his a-ray scattering experiment. In what way is the Rutherford’s atomic model different from that of Thomson’s atomic model?Page: 1
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NCERT Solutions for Class 9 Science- Structure Of The Atom (Chemistry), NCERT Textbook Solutions for Class 9 Science, NCERT Solutions For Class 9 Chemistry, Structure Of The Atom - Class 9th NCERT Solutions Science, NCERT Solutions For Class 9 Chemistry Science Chapter 4 - Structure Of The Atom, Science - Chemistry - Class 9 (CBSE/NCERT) - Chapter 4 – Structure Of The Atom – Questions and Answers/Notes/Worksheets, CBSE Class 9 - Chemistry – Chapter 4 - Structure Of The Atom Practice Pages, Extra Question and Answer based on NCERT for Class 9th, Science Chemistry, CBSE Grade IX free Worksheets PDF Structure Of The Atom exemplar question answer, NCERT Book question answer, Science Question bank on Structure Of The Atom for ninth standard, Structure Of The Atom, Summarise the rules for writing of distribution of electrons in various shells for the first eighteen elements. Match the names of the Scientists given in column A with their contributions towards the understanding of the atomic structure as given in column B. How will you find the valency of chlorine, sulphur and magnesium? Compare all the proposed models of an atom given in this chapter. Explain with examples (i) Atomic number, (ii) Mass number, (iii) Isotopes and iv) Isobars. Give any two uses of isotopes.Page: 1
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NCERT Solutions for Class 9 Science- The Fundamental Unit Of Life (Biology), NCERT Textbook Solutions for Class 9 Science, NCERT Solutions For Class 9 Biology, The Fundamental Unit Of Life - Class 9th NCERT Solutions Science, NCERT Solutions For Class 9 Biology Science Chapter 5 - The Fundamental Unit Of Life, Science - Biology - Class 9 (CBSE/NCERT) - Chapter 5 – The Fundamental Unit Of Life – Questions and Answers/Notes/Worksheets, CBSE Class 9 - Biology – Chapter 5 - The Fundamental Unit Of Life Practice Pages, Extra Question and Answer based on NCERT for Class 9th, Science Biology, CBSE Grade IX free Worksheets PDF The Fundamental Unit Of Life exemplar question answer, NCERT Book question answer, Science Question bank on The Fundamental Unit Of Life for ninth standard, The Fundamental Unit Of Life, Where are proteins synthesized inside the cell? Name any cell organelle which is non-membranous. What is the primary function of leucoplasts? Name some single celled organisms. Where do the lipids and proteins constituting the cell membrane get synthesised? Can you name the two organelles we have studied that contain their own genetic material? Chromosomes are made up of (a) DNA (b) protein (c) DNA and protein (d) RNA. Kitchen of the cell is (a) mitochondria (b) endoplasmic reticulum (c) chloroplast (d) Golgi apparatus. Silver nitrate solution is used to study (a) endoplasmic reticulum (b) Golgi apparatus (c) nucleus (d) mitochondria. 1 µm is (a) 10-6m (b) 10-9m (c) 10-10m (d) 10-3m, Name the two organelles in a plant cell that contain their own genetic material and ribosomes. Which of the following are covered by a single membrane? (a) Mitochondria (b) Vacuole (c) Lysosome (d) Plastid, Bacteria do not have chloroplast, but some bacteria are photoautotrophic in nature and perform photosynthesis. Which part of bacterial cell performs this? If the organisation of a cell is destroyed due to some physical or chemical influence, what will happen? Lysosome arises from (a) endoplasmic reticulum , (b) Golgi apparatus (c) nucleus (d) mitochondria. What is osmosis? Organelle other than nucleus, containing DNA is (a) endoplasmic reticulum (b) Golgi apparatus (c) mitochondria (d) lysosome. Which kind of plastid is more common in (a) roots of the plant (b) leaves of the plant (c) flowers and fruits. A cell will swell up if (a) the concentration of water molecules in the cell is higher than the concentration of water molecules in surrounding medium (b) the concentration of water molecules in surrounding medium is higher than water molecules concentration in the cell (c) the concentration of water molecules is same in the cell and in the surrounding medium (d) concentration of water molecules does not matter, Why are lysosomes known as suicide bags? Cell arises from pre-existing cell was stated by (a) Haeckel (b) Virchow (c) Hooke (d) Schleiden. Living cells were discovered by (a) Robert Hooke (b) Purkinje (c) Leeuwenhoek (d) Robert Brown. Which of these is not related to endoplasmic reticulum? (a) It behaves as transport channel for proteins between nucleus and cytoplasm. (b) It transports materials between various regions in cytoplasm. (c) It can be the site of energy generation. (d) It can be the site for some biochemical activities of the cell. Write the name of different plant parts in which chromoplast, chloroplast and leucoplast are present.Page: 1
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NCERT Solutions for Class 9 Science- The Fundamental Unit Of Life (Biology), NCERT Textbook Solutions for Class 9 Science, NCERT Solutions For Class 9 Biology, The Fundamental Unit Of Life - Class 9th NCERT Solutions Science, NCERT Solutions For Class 9 Biology Science Chapter 5 - The Fundamental Unit Of Life, Science - Biology - Class 9 (CBSE/NCERT) - Chapter 5 – The Fundamental Unit Of Life – Questions and Answers/Notes/Worksheets, CBSE Class 9 - Biology – Chapter 5 - The Fundamental Unit Of Life Practice Pages, Extra Question and Answer based on NCERT for Class 9th, Science Biology, CBSE Grade IX free Worksheets PDF The Fundamental Unit Of Life exemplar question answer, NCERT Book question answer, Science Question bank on The Fundamental Unit Of Life for ninth standard, The Fundamental Unit Of Life, Cell wall of which one of these is not made up of cellulose? (a) Bacteria (b) Hydrilla (c) Mango tree (d) Cactus, What is the purpose of the large central vacuole in plant cells? What role does the central vacuole in a plant cell have? Write a short note on prokaryotic cells. How does an Amoeba obtain its food? Amoeba acquires its food through a process, termed (a) exocytosis (b) endocytosis (c) plasmolysis (d) exocytosis and endocytosis both. We eat food composed of all the nutrients like carbohydrates, proteins, fats, vitamins, minerals and water. After digestion, these are absorbed in the form of glucose, amino acids, fatty acids, glycerol etc. What mechanisms are involved in absorption of digested food and water? If you are provided with some vegetables to cook, you generally add salt into the vegetables during cooking process. After adding salt, vegetables release water. What mechanism is responsible for this? Which cell organelle plays a crucial role in detoxifying many poisons and drugs in a cell? (a) Golgi apparatus (b) Lysosomes (c) Smooth endoplasmic reticulum (d) Vacuoles, Lipid molecules in the cell are sythesised by (a) smooth endoplasmic reticulum (b) rough endoplasmic reticulum (c) Golgi apparatus (d) plastids. Organelle without a cell membrane is (a) ribosome (b) Golgi apparatus (c) chloroplast (d) nucleus. Do you agree that “a cell is a building unit of an organism”. If yes, explain why? Why is the plasma membrane called a selectively permeable membrane? Who discovered cells, and how? Find out the false sentences. (a) Golgi apparatus is involved with the formation of lysosomes. (b) Nucleus, mitochondria and plastid have DNA; hence they are able to make their own structural proteins. (c) Mitochondria is said to be the power house of the cell as ATP is generated in them. (d) Cytoplasm is called as protoplasm. The only cell organelle seen in prokaryotic cell is (a) mitochondria (b) ribosomes (c) plastids (d) lysosomes. The proteins and lipids, essential for building the cell membrane, are manufactured by (a) rough endoplasmic reticulum (b) Golgi apparatus (c) plasma membrane (d) mitochondria. Select the odd one out. (a) The movement of water across a semi- permeable membrane is affected by the amount of substances dissolved in it. (b) Membranes are made of organic molecules like proteins and lipids. (c) Molecules soluble in organic solvents can easily pass through the membrane. (d) Plasma membranes contain chitin sugar in plants.Page: 1
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NCERT Solutions for Class 9 Science- The Fundamental Unit Of Life (Biology), NCERT Textbook Solutions for Class 9 Science, NCERT Solutions For Class 9 Biology, The Fundamental Unit Of Life - Class 9th NCERT Solutions Science, NCERT Solutions For Class 9 Biology Science Chapter 5 - The Fundamental Unit Of Life, Science - Biology - Class 9 (CBSE/NCERT) - Chapter 5 – The Fundamental Unit Of Life – Questions and Answers/Notes/Worksheets, CBSE Class 9 - Biology – Chapter 5 - The Fundamental Unit Of Life Practice Pages, Extra Question and Answer based on NCERT for Class 9th, Science Biology, CBSE Grade IX free Worksheets PDF The Fundamental Unit Of Life exemplar question answer, NCERT Book question answer, Science Question bank on The Fundamental Unit Of Life for ninth standard, Name the parts which (a) determines the function and development of the cell (b) packages materials coming from the endoplasmic reticulum (c) provides resistance to microbes to withstand hypotonic external media without bursting (d) is site for many biochemical reactions necessary to sustain life. (e) is a fluid contained inside the nucleus. Which of the following can be made into crystal? (a) A bacterium (b) An Amoeba (c) A virus (d) A sperm, Plasmolysis in a plant cell is defined as (a) breakdown (lysis) of plasma membrane in hypotonic medium (b) shrinkage of cytoplasm in hypertonic medium (c) shrinkage of nucleoplasm (d) none of them, Which of these options are not functions of ribosomes? (i) It helps in manufacture of protein molecules. (ii) It helps in manufacture of enzymes. (iii) It helps in manufacture of hormones. (iv) It helps in manufacture of starch molecules. (a) (i)and(ii) (b) (ii) and (iii) (c) (iii) and (iv) (d) (iv) and (i), A person takes concentrated solution of salt, after some time, he starts vomiting. What is the phenomenon responsible for such situation? Explain. What is Golgi apparatus? Draw a neat labelled diagram of a prokaryotic cell. Find out the correct sentence. (a) Enzymes packed in lysosomes are made through RER (rough endoplasmic reticulum). (b) Rough endoplasmic reticulum and smooth endoplasmic reticulum produce lipid and protein respectively. (c) Endoplasmic reticulum is related with the destruction of plasma membrane. (d) Nucleoid is present inside the nucleoplasm of eukaryotic nucleus. Why does the skin of your finger shrink when you wash clothes for a long time? Why do plant cells possess large sized vacuole? Which organelle is known as the powerhouse of the cell? Why? Which cell organelle controls most of the activities of the cell? The undefined nuclear region of prokaryotes are also known as (a) nucleus (b) nucleolus (c) nucleic acid (d) nucleoid. Why is the cell called the structural and functional unit of life? Cell theory was given by (a) Schleiden and Schwann (b) Virchow (c) Hooke (d) Haeckel.Page: 1
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NCERT Solutions for Class 9 Science- The Fundamental Unit Of Life (Biology), NCERT Textbook Solutions for Class 9 Science, NCERT Solutions For Class 9 Biology, The Fundamental Unit Of Life - Class 9th NCERT Solutions Science, NCERT Solutions For Class 9 Biology Science Chapter 5 - The Fundamental Unit Of Life, Science - Biology - Class 9 (CBSE/NCERT) - Chapter 5 – The Fundamental Unit Of Life – Questions and Answers/Notes/Worksheets, CBSE Class 9 - Biology – Chapter 5 - The Fundamental Unit Of Life Practice Pages, Extra Question and Answer based on NCERT for Class 9th, Science Biology, CBSE Grade IX free Worksheets PDF The Fundamental Unit Of Life exemplar question answer, NCERT Book question answer, Science Question bank on The Fundamental Unit Of Life for ninth standard, What would happen if the plasma membrane ruptures or breaks down? Following are a few definitions of osmosis. Read carefully and select the correct definition. (a) Movement of water molecules from a region of higher concentration to a region of lower concentration through a semi- permeable membrane. (b) Movement of solvent molecules from its higher concentration to lower concentration. (c) Movement of solvent molecules from higher concentration to lower concentration of solution through a permeable membrane. (d) Movement of solute molecules from lower concentration to higher concentration of solution through a semi-permeable membrane. Name the organelles which show the analogy written as under (a) Transporting channels of the cell _______ (b) Power house of the cell _______ (c) Packaging and dispatching unit of the cell _______ (d) Digestive bag of the cell _______ (e) Storage sacs of the cell _______ (f) Kitchen of the cell _______ (g) Control room of the cell _______ , The cell organelle involved in forming complex sugars from simple sugars are (a) endoplasmic reticulum (b) ribosomes (c) plastids (d) Golgi apparatus. Differentiate between nucleus and nucleoid. Write a short note on plastids. Why is endocytosis found in animals only? Which out of the following is not a function of vacuole? (a) Storage (b) Providing turgidity and rigidity to the cell (c) Waste excretion (d) Locomotion, Make a comparison and write down ways in which plant cells are different from animal cells. How is a prokaryotic cell different from a eukaryotic cell? How is a bacterial cell different from an onion peel cell? What are the consequences of the following conditions? (a) A cell containing higher water concentration than the surrounding medium. (b) A cell having low water concentration than the surrounding medium. (c) A cell having equal water concentration to its surrounding medium. How do substances like CO2 and water move in and out of the cell? Discuss.Page: 1
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NCERT Solutions for Class 9 Science- The Fundamental Unit Of Life (Biology), NCERT Textbook Solutions for Class 9 Science, NCERT Solutions For Class 9 Biology, The Fundamental Unit Of Life - Class 9th NCERT Solutions Science, NCERT Solutions For Class 9 Biology Science Chapter 5 - The Fundamental Unit Of Life, Science - Biology - Class 9 (CBSE/NCERT) - Chapter 5 – The Fundamental Unit Of Life – Questions and Answers/Notes/Worksheets, CBSE Class 9 - Biology – Chapter 5 - The Fundamental Unit Of Life Practice Pages, Extra Question and Answer based on NCERT for Class 9th, Science Biology, CBSE Grade IX free Worksheets PDF The Fundamental Unit Of Life exemplar question answer, NCERT Book question answer, Science Question bank on The Fundamental Unit Of Life for ninth standard, Draw a neat labelled diagram of a plant cell. Draw a neat labelled diagram of an animal cell. If cells of onion peel and RBC are separately kept in hypotonic solution, what among the following will take place? Explain the reason for your answer. (a) Both the cells will swell. (b) RBC will burst easily while cells of onion peel will resist the bursting to some extent. (c) Both ‘a’ and ‘b’ are correct. (d) RBC and onion peel cells will behave similarly. What would happen to the life of a cell if there was no Golgi apparatus? Differentiate between rough and smooth endoplasmic reticulum. How is endoplasmic reticulum important for membrane biogenesis? Carry out the following osmosis experiment: Take four peeled potato halves and scoop each one out to make potato cups. One of these potato cups should be made from a boiled potato. Put each potato cup in a trough containing water. Now, (a) Keep cup A empty (b) Put one teaspoon sugar in cup B (c) Put one teaspoon salt in cup C (d) Put one teaspoon sugar in the boiled potato cup D. Keep these for two hours. Then observe the four potato cups and answer the following: (i) Explain why water gathers in the hollowed portion of B and C. (ii) Why is potato A necessary for this experiment? (iii) Explain why water does not gather in the hollowed out portions of A and D. In brief state what happens when (a) Dry apricots are left for some time in pure water and later transferred to sugar solution. (b) A red blood cell is kept in concentrated saline solution. (c) The plasma membrane of a cell breaks down. (d) Rheo leaves are boiled in water first and then a drop of sugar syrup is put on it. (e) Golgi apparatus is removed from the cell.Page: 1
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NCERT Solutions for Class 9 Science - Tissues (Biology), NCERT Textbook Solutions for Class 9 Science, NCERT Solutions For Class 9 Biology, Tissues - Class 9th NCERT Solutions Science, NCERT Solutions For Class 9 Biology Science Chapter 6 - Tissues, Science - Biology - Class 9 (CBSE/NCERT) - Chapter 6 – Tissues – Questions and Answers/Notes/Worksheets, CBSE Class 9 - Biology – Chapter 6 - Tissues Practice Pages, Extra Question and Answer based on NCERT for Class 9th, Science Biology, CBSE Grade IX free Worksheets PDF Tissues exemplar question answer, NCERT Book question answer, Science Question bank on Tissues for ninth standard, The Fundamental Unit Of Life, Which of the following tissues has dead cells? (a) Parenchyma (b) Sclerenchyma (c) Collenchyma (d) Epithelial tissue. Find out incorrect sentence. (a) Parenchymatous tissues have intercellular spaces. (b) Collenchymatous tissues are irregularly thickened at corners. (c) Apical and intercalary meristems are permanent tissues. (d) Meristematic tissue, in its early stage, lacks vacuoles. Girth of stem increases due to (a) apical meristem (b) lateral meristem (c) intercalary meristem (d) vertical meristem. Which cell does not have perforated cell wall? (a) Tracheids (b) Companion cells (c) Sieve tubes (d) Vessels. Intestine absorbs the digested food materials. What type of epithelial cells are responsible for that? (a) Stratified squamous epithelium (b) Columnar epithelium (c) Spindle fibres (d) Cuboidal epithelium. A person met with an accident in which two long bones of hand were dislocated. Which among the following may be the possible reason? (a) Tendon break (b) Break of skeletal muscle (c) Ligament break (d) Areolar tissue break. While doing work and running, you move your organs like hands, legs etc. Which among the following is correct? (a) Smooth muscles contract and pull the ligament to move the bones (b) Smooth muscles contract and pull the tendons to move the bones (c) Skeletal muscles contract and pull the ligament to move the bones (d) Skeletal muscles contract and pull the tendon to move the bones. Which muscles act involuntarily? (i) Striated muscles (ii) Smooth muscles (iii) Cardiac muscles (iv) Skeletal muscles. Meristematic tissues in plants are (a) localised and permanent (b) not limited to certain regions (c) localised and dividing cells (d) growing in volume. Which is not a function of epidermis? (a) Protection from adverse condition (b) Gaseous exchange (c) Conduction of water (d) Transpiration. Select the incorrect sentence (a) Blood has matrix containing proteins, salts and hormones (b) Two bones are connected with ligament (c) Tendons are non-fibrous tissue and fragile (d) Cartilage is a form of connective tissue. Cartilage is not found in (a) nose (b) ear (c) kidney (d) larynx. Fats are stored in human body as (a) cuboidal epithelium (b) adipose tissue (c) bones (d) cartilage. Bone matrix is rich in (a) fluoride and calcium (b) calcium and phosphorus (c) calcium and potassium (d) phosphorus and potassium. Contractile proteins are found in (a) bones (b) blood (c) muscles (d) cartilage. Voluntary muscles are found in (a) alimentary canal (b) limbs (c) iris of the eye (d) bronchi of lungs. Nervous tissue is not found in (a) brain (b) spinal cord (c) tendons (d) nerves. Nerve cell does not contain (a) axon (b) nerve endings (c) tendons (d) dendrites. Which of the following helps in repair of tissue and fills up the space inside the organ? (a) Tendon (b) Adipose tissue (c) Areolar (d) Cartilage. The muscular tissue which functions throughout the life continuously without fatigue is (a) skeletal muscle (b) cardiac muscle (c) smooth muscle (d) voluntary muscle. Which of the following cells is found in the cartilaginous tissue of the body? (a) Mast cells (b) Basophils (c) Osteocytes (d) ChondrocytesPage: 1
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NCERT Solutions for Class 9 Science - Tissues (Biology), NCERT Textbook Solutions for Class 9 Science, NCERT Solutions For Class 9 Biology, Tissues - Class 9th NCERT Solutions Science, NCERT Solutions For Class 9 Biology Science Chapter 6 - Tissues, Science - Biology - Class 9 (CBSE/NCERT) - Chapter 6 – Tissues – Questions and Answers/Notes/Worksheets, CBSE Class 9 - Biology – Chapter 6 - Tissues Practice Pages, Extra Question and Answer based on NCERT for Class 9th, Science Biology, CBSE Grade IX free Worksheets PDF Tissues exemplar question answer, NCERT Book question answer, Science Question bank on Tissues for ninth standard, The Fundamental Unit Of Life, The dead element present in the phloem is (a) companion cells (b) phloem fibres (c) phloem parenchyma (d) sieve tubes. Which of the following does not lose their nucleus at maturity? (a) Companion cells (b) Red blood cells (c) Vessel (d) Sieve tube cells. In desert plants, the rate of water loss gets reduced due to the presence of (a) cuticle (b) stomata (c) lignin (d) suberin. A long tree has several branches. The tissue that helps in the sideways conduction of water in the branches is (a) collenchyma (b) xylem parenchyma (c) parenchyma (d) xylem vessels. If the tip of sugarcane plant is removed from the field, even then it keeps on growing in length. It is due to the presence of (a) cambium (b) apical meristem (c) lateral meristem (d) intercalary meristem. A nail is inserted in the trunk of a tree at a height of 1 metre from the ground level. After 3 years the nail will (a) move downwards (b) move upwards (c) remain at the same position (d) move sideways. Parenchyma cells are (a) relatively unspecified and thin-walled (b) thick-walled and specialised (c) lignified (d) none of these. Flexibility in plants is due to (a) collenchyma (b) sclerenchyma (c) parenchyma (d) chlorenchyma. Cork cells are made impervious to water and gases by the presence of (a) cellulose (b) lipids (c) suberin (d) lignin. Survival of plants in the terrestrial environment has been made possible by the presence of (a) intercalary meristem (b) conducting tissue (c) apical meristem (d) parenchymatous tissue. Choose the wrong statement (a) The nature of matrix differs according to the function of the tissue (b) Fats are stored below the skin and in between the internal organs (c) Epithelial tissues have intercellular spaces between them (d) Cells of striated muscles are multinucleate and unbranched. The water conducting tissue generally present in gymnosperm is (a) vessels (b) sieve tube (c) tracheids (d) xylem fibres. Differentiate the following activities on the basis of voluntary (V) or involuntary (I V) muscles. (a) Jumping of frog (b) Pumping of the heart (c) Writing with hand (d) Movement of chocolate in your intestine. Where is apical meristem found? Which tissue makes up the husk of coconut? Name types of simple tissues. What is the utility of tissues in multi-cellular organisms? What are the constituents of phloem? Define the term “tissue”. What is a tissue? How many types of elements together make up the xylem tissue? Name them. Fill in the blanks. (a) Cork cells possess _____ on their walls that makes them impervious to gases and water. (b) _____ have tubular cells with perforated walls and are living in nature. (c) Bone possess a hard matrix composed of _____and _____.Page: 1
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NCERT Solutions for Class 9 Science - Tissues (Biology), NCERT Textbook Solutions for Class 9 Science, NCERT Solutions For Class 9 Biology, Tissues - Class 9th NCERT Solutions Science, NCERT Solutions For Class 9 Biology Science Chapter 6 - Tissues, Science - Biology - Class 9 (CBSE/NCERT) - Chapter 6 – Tissues – Questions and Answers/Notes/Worksheets, CBSE Class 9 - Biology – Chapter 6 - Tissues Practice Pages, Extra Question and Answer based on NCERT for Class 9th, Science Biology, CBSE Grade IX free Worksheets PDF Tissues exemplar question answer, NCERT Book question answer, Science Question bank on Tissues for ninth standard, The Fundamental Unit Of Life, Draw a labelled diagram of a neuron. Name the regions in which parenchyma tissue is present. What is the role of epidermis in plants? Name the tissue responsible for movement in our body. How does the cork act as a protective tissue? Water hyacinth float on water surface. Explain. If a potted plant is covered with a glass jar, water vapours appear on the wall of glass jar. Explain why? Fill in the blanks. (a) Lining of blood vessels is made up of _____. (b) Lining of small intestine is made up of _____. (c) Lining of kidney tubules is made up of _____. (d) Epithelial cells with cilia are found in_____ of our body. Animals of colder regions and fishes of cold water have thicker layer of subcutaneous fat. Describe why? What is the specific function of the cardiac muscle? Write true (T) or false (F). (a) Epithelial tissue is protective tissue in animal body. (b) The lining of blood vessels, lung alveoli and kidney tubules are all made up of epithelial tissue. (c) Epithelial cells have a lot of intercellular spaces. (d) Epithelial layer is permeable layer. (e) Epithelial layer does not allow regulation of materials between body and external environment. Which structure protects the plant body against the invasion of parasites? Give reasons for (a) Meristematic cells have a prominent nucleus and dense cytoplasm but they lack vacuole. (b) Intercellular spaces are absent in sclerencymatous tissues. (c) We get a crunchy and granular feeling, when we chew pear fruit. (d) Branches of a tree move and bend freely in high wind velocity. (e) It is difficult to pull out the husk of a coconut tree. What are the functions of the stomata? Identify the type of tissue in the following: skin, bark of tree, bone, lining of kidney tubule, vascular bundle. How are simple tissues different from complex tissues in plants? Name the following. (a) Tissue that forms the inner lining of our mouth. (b) Tissue that connects muscle to bone in humans. (c) Tissue that transports food in plants. (d) Tissue that stores fat in our body. (e) Connective tissue with a fluid matrix. (f) Tissue present in the brain.Page: 1
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NCERT Solutions for Class 9 Science - Tissues (Biology), NCERT Textbook Solutions for Class 9 Science, NCERT Solutions For Class 9 Biology, Tissues - Class 9th NCERT Solutions Science, NCERT Solutions For Class 9 Biology Science Chapter 6 - Tissues, Science - Biology - Class 9 (CBSE/NCERT) - Chapter 6 – Tissues – Questions and Answers/Notes/Worksheets, CBSE Class 9 - Biology – Chapter 6 - Tissues Practice Pages, Extra Question and Answer based on NCERT for Class 9th, Science Biology, CBSE Grade IX free Worksheets PDF Tissues exemplar question answer, NCERT Book question answer, Science Question bank on Tissues for ninth standard, The Fundamental Unit Of Life, What does a neuron look like? Why is epidermis important for the plants? Name the different components of xylem and draw a living component. Draw and identify different elements of phloem. Fill in the blanks. (a) ______ are forms of complex tissue. (b) ______ have guard cells. (c) Cells of cork contain a chemical called ______. (d) Husk of coconut is made of ______ tissue. (e) ______ gives flexibility to plants. (f) ______ and ______ are both conducting tissues. (g) Xylem transports ______ and ______ from soil. (h) Phloem transports ______ from ______ to other parts of the plant. Differentiate between parenchyma, collenchyma and sclerenchyma on the basis of their cell wall. Differentiate between striated, unstriated and cardiac muscles on the basis of their structure and site/location in the body. Differentiate between voluntary and involuntary muscles. Give one example of each type.Page: 1
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NCERT Solutions for Class 9 Science - Tissues (Biology), NCERT Textbook Solutions for Class 9 Science, NCERT Solutions For Class 9 Biology, Tissues - Class 9th NCERT Solutions Science, NCERT Solutions For Class 9 Biology Science Chapter 6 - Tissues, Science - Biology - Class 9 (CBSE/NCERT) - Chapter 6 – Tissues – Questions and Answers/Notes/Worksheets, CBSE Class 9 - Biology – Chapter 6 - Tissues Practice Pages, Extra Question and Answer based on NCERT for Class 9th, Science Biology, CBSE Grade IX free Worksheets PDF Tissues exemplar question answer, NCERT Book question answer, Science Question bank on Tissues for ninth standard, Differentiate between sclerenchyma and parenchyma tissues. Draw well labelled diagram. List the characteristics of cork. How are they formed? Mention their role. (a) Differentiate between meristematic and permanent tissues in plants (b) Define the process of differentiation. Name any two simple and two complex permanent tissues in plants. Describe the structure and function of different types of epithelial tissues. Draw diagram of each type of epithelial tissue.Page: 1