Name: ______________________________________________________________ Hour: ____________
Section 3.3: Phase Changes
1. What is a phase change?
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Match each term with the letter of the phase-change description that best describes it.
2. _____ Freezing
a. Solid to gas
3. _____ Sublimation
b. Liquid to gas
4. _____ Condensation
c. Gas to solid
5. _____ Melting
d. Liquid to solid
6. _____ Deposition
e. Gas to liquid
7. _____ Vaporization
f. Solid to liquid
8. What happens to the temperature of a substance during a phase change?
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9. The temperature at which a substance freezes is _____________ than the temperature at which
it melts.
10. Circle the letter that describes the behavior of a substance during a phase change.
a. Neither absorbs nor release energy
c. Always absorbs energy
b. Always releases energy
d. Either absorbs or releases energy
11. A substance absorbs energy from its surroundings during a(n) _____________________ change.
12. As water freezes, it releases heat to its surroundings. Freezing is an example of a(n)
_________________________ change.
13. Water molecules have a more orderly arrangement in ice than in liquid water.
a. True
b. False
14. When liquid water freezes, the average kinetic energy of its molecules
________________________, and the arrangement of the molecule becomes more orderly.
15. Vaporization is the phase change in which a substance changes from a(n)
__________________________ into a(n) _____________________________.
16. When water vapor collects above the liquid in a closed container, the pressure caused by the
collisions of this vapor and the walls of the container is called vapor pressure.
a. True
b. False
17. The phase change in which a substance changes from a gas into a liquid is called _____________
18. Compare and contrast the processes of evaporation and boiling by completing the table below.
Evaporation and Boiling
Process
Phase Change
Where It Occurs
Temperature
Evaporation
Boiling
19. A gas absorbs energy as it changes into a liquid.
a. True
b. False
20. Dry ice can change directly from a solid to a gas without forming a liquid first. This process is an
example of ________________________________
21. What is deposition?
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22. Underneath Endothermic write the three phase changes that are endothermic while underneath
Exothermic write the three phase changes that are exothermic.
Endothermic
Exothermic
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