CLASS-IX

SUBJECT-CHEMISTRY

WORKSHEET

Fill in the blanks:-

1. Matter is made up of small_________.
2. The forces of attraction between the particles are _______ in solids, ______ in liquids and _________ in gases.
3. __________ is the change of gaseous state directly to solid state without going through liquid state, and vice-versa.
4. Evaporation causes __________.
5. Latent heat of fusion is the amount of heat energy required to change 1 kg of solid into liquid at its ________.
6. Solid, liquid and gas are called the three _______ of matter.
7. The smell of perfume gradually spreads across a room due to ______.
8. Rapid evaporation depends on the ______ area exposed to atmosphere.
9. As the temperature of a system increases, the pressure of the gases ______.
10. As the volume of a specific amount of gas decreases, it’s pressure _______.
11. As the temperature of a gas decreases, I’s volume ______.
12. Gas molecules at higher temperatures have more _______ than at cooler temperatures.
13. Usually the total charge of a plasma is _______.
14. The pressure inside of a sealed tube if you raise the temperature go ______
15. Forces of attraction in liquids are _______ than in olid.
16. Liquids that move quickly downhill are described as having _____.


ANSWER THE FOLLOWING QUESTIONS
1. What is solid carbon-di oxide?Where is it used?
2.Define sublimations and name some solids which undergo sublimation?
3.write down an activity to show sublimaton?
4.Difference between sublimation and deposition?
5.Why does napthalene balls disappear over a period of time?