11. Matter and Water
1. Fill in the blanks.
1) The change of state of matter occurs because of ___________________
changes.
2) ___________________ are the smallest particles of which matter is made of.
3) The fast conversion of a liquid to a gas is known as ___________________.
4) The molecules in ___________________ are not so closely packed as in solids
and are ___________________ to move about.
2. Name four solids that are (1)hard and (2)soft.
3. Define the following.
1) Fog 2) Snow 3) Solute 4) Frost 5) Dew 6) Hail 7) Solution 8) Insoluble
substance.
4. State whether the following statements are true or false.
1) The best and safest method of water purification is boiling.
2) Water should not be purified before we use it for drinking and cooking.
3) Insoluble impurities like sand settle at the bottom of the container.
4) Germs present in water cannot be killed by using chemicals like chlorine.
5) A solute dissolves faster in cold water.
6) The molecules are packed very close to each other in solids.
7) The process of cooling down a gas so that it becomes liquid is known as freezing.
8) Filtration is the safest method of water purification.
9) Sand is insoluble in water.
10) Germs present in water can be killed by using chlorine.
5. Answer the following questions.
1) On what factor do the properties of a substance depend?
2) What is the arrangement of molecules in solids and gases?
3) Liquids do not have a fixed shape and can flow easily. Why?
4) What happens during evaporation and condensation of water in nature ? Explain.
5) Define the terms (a) solute (b) solvent (c) solution.
6) Under which conditions does a solute dissolve faster in water?
7) Differentiate between soluble and insoluble substances.
8) What are the different methods of purification of water?
9) What is a solution?
10) What is meant by sedimentation?
11) Name two qualities of solid.
12) How is liquid different from solid?
13) Mention the qualities of gas. Give examples of gases.
14) What are the qualities of powders?
6. Tick the correct answer.
1) Which of these is a soft solid?
(a) Cloth (b) Diamond (c) Gold
2) When a thick cloud of water drops is formed just above land or water, it is called
(a) hail (b) dew (c) fog
3) The liquid in which a solid dissolves completely is called
(a) solute (b) solvent (c) solution
4) Which of these is a process of purification of water which kills germs?
(a) Decantation (b) Filtration (c) Boiling (d) Evaporation
5) When raindrops freeze and fall on the earth as small pellets of ice, they are called
(a) fog (b) hail (c) frost
6) Which of these is a soluble substance?
(a) Sand (b) Stone (c) Sugar
7. Complete the web chart.
1)
2)
8. Each of the following clues describe processes which end with 'on'. Name them.
1) The slow conversion of a liquid into a gas
2) The process of settling down of insoluble substances in water
3) The process in which insoluble substances remain in a filter paper and clear
water is obtained
9. Answer in one or few words.
1) Molecules are composesd of small particles called ___________________.
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