Science - Class 9

Q15. What are the types of pure substances?

Or

How matter is classified in terms of composition?

 

Q16. What are the types of mixtures?

 

Q17. How are elements further classified?

 

Q18. Is dye in black ink a single colour? Justify your answer.

 

Q19. What is meant by a pure substance?

 

Q20. What is the principle of separating immiscible liquids using separating funnel?

 

Q21. What type of liquid mixture will kerosene oil and water form?

Or

What happens when you mix water and kerosene?

 

Q22. Identify the solutions among the following mixtures.

(a) Soil

(b) Sea water

(c) Air

(d) Coal

(e) Soda water. 

 

Q23. What is meant by concentration of a solution?

 

Q24. What is meant by solubility?

 

Q25. Classify each of the following as a homogeneous or heterogeneous mixture. soda water, wood, air, soil, vinegar, filtered tea.

 

Q26. 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 

 

Q27. Which method is used to obtain copper sulphate from an impure sample?

 

Q28. What is tincture of iodine? Identify the solute and solvent in it.

 

Q29. Define element.

 

Q30. What is a mixture?

 

Q31. Try segregating the things around you as pure substances or mixtures.

 

Q32. What is an unsaturated solution?

 

Q33. What do you mean by interconversion of states of matter?

 

Q34. Out of colloid, solution and a suspension which one can be separated by filtration.

 

Q35. What are metalloids? Give examples.

 

Q36. Give an example of a solution in which solid is a solute as well as the solvent.

 

Q37. Can we separate alcohol dissolved in water by using a separating funnel? If yes, then describe the procedure. If not, explain.

 

Q38. Name the technique to separate

(i) butter from curd,

(ii) salt from sea-water,

(iii) camphor from salt.