SAT Subject Physics Practice Question 180: Answer and Explanation

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Question: 180

26. Which of the following statements is true concerning phase changes?

A. When a liquid freezes, it releases thermal energy into its immediate environment.
B. When a solid melts, it releases thermal energy into its immediate environment.
C. For most substances, the latent heat of fusion is greater than the latent heat of vaporization.
D. As a solid melts, its temperature increases.
E. As a liquid freezes, its temperature decreases.

Correct Answer: A

Explanation:

B is false, because a solid must absorb thermal energy in order to melt. C is false since it generally requires much more energy to break the intermolecular bonds of a liquid to change its state to vapor than to loosen the intermolecular bonds of a solid to change its state to liquid. And D and E are false: While a substance undergoes a phase change, its temperature remains constant. The answer must be A.

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