Environmental Scienc ...

State True (T) or false (F).

                     i.        Density is a measure of how easily the substance dissolves in water. ___________

                    ii.        Material that does not retain its fixed shape is called liquid. _________

                    iii.        Matter can exist in one of three main states: solid, liquid, or gas. ______

                    iv.        A solid's particles are loosely packed._______

                     v.        Gas can flow and expands to fill all the space available to it. ________

                     vi.        On freezing water molecules give up their heat and settle closer together. ___________

Fill in the blanks.

                      i.        All materials are made up of _______________.

                     ii.        All matter takes up space and has some _____________.

                    iii.        Matter is made up of very small particles called ________________.

                     iv.        Solid, liquid and _______ are the three states of matter.

                      v.        Water changes to _____________ on heating.

                    vi.        Materials that do not dissolve in water are said to be _______________

        vii.        _____________ molecules are totally free to move around.

Match the following.

Molecule

Materials that dissolve in water.

Insoluble substances

Melt into liquid when they are heated.

Most solids

Particles are packed densely enough that volume is   maintained.

Soluble substances

Group of atoms bonded together.

Liquid

Materials that do not dissolve in water.

Answer the following:

1. What are molecules?

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2. What do you understand by insoluble substance? Give examples.

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3. Write 3 different states of matter.

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4. Why liquid does not retain its fixed shape?

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5. Write two characteristics of gas.

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6. Write an experiment to show that gas has weight.

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Answer the following:

1. Define matter?

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2. Write any 3 physical properties of matter.

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3. Why are solids hard substances?

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4. Differentiate between solid and liquid.

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5. What happen when you boil water in a container?

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6. Write an example when a solid melts on heating and solidifies again on cooling.

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