Effect of Temperature to Phase Changes in Matter

1. Which is the hottest object?

• a. a rock at night

• b. a rock under the sun

• c. a rock in a refrigerator

• d. a rock at the top of the mountain

2. What will happen to an iron bar as it gets hot?

• a. it becomes bigger

• b. it becomes smaller

• c. it becomes heavier

• d. It becomes much stronger

3. What happens to an ice cube if you slowly heat it?

• a. it gets harder

• b. it turns to gas

• c. it turns to liquid

• d. it turns to solid

4. What happened during evaporation process?

• a. water freezes into ice

• b. when a liquid turning into solid

• c. a process of liquid turning into gas

• d. when a gas turns back into a liquid

5. What causes ice cream to change from solid into a liquid?

• a. The surrounding cold air.

• b. Ice cream always melts when exposed to oxygen.

• c. The room temperature that is warmer than the ice cream.

• d. Ice cream naturally melts when exposed to the atmosphere.

6. What would be the effect on the particles if more heat is supplied to the system?

• A. They would slow down

• B. They would speed up

• C. They would stop moving

• D. There would be no effect

7. All phase changes (changing states) requires energy to be added or taken away condensation.

• A. false

• B. maybe

• C. no

• D. true

8. When you heat a sample of a solid, what happen to the particles that make up the solid?

• A. Slow down

• B. Gets bigger

• C. Move faster

• D. Loose mass

9. Food coloring spread-out faster in hot water than in cold water. This is mainly because?

• A. hot water is less dense

• B. the food coloring molecules are small.

• C. the molecules are hot, waters are larger.

• D. the water molecules in hot move rapidly.

10. When a thermometer is heated, the red liquid inside the thermometer moves up, this is mainly because,

• A. hot liquid is lighter.

• B. the molecules of the liquid move faster and get a little further apart.

• C. hot liquid is lighter, so the molecules goes down and the gas spreads up.

• D. The glass of thermometer gets hot and the molecules inside boils that tends to move up the red liquid.