SAT Subject Physics Practice Question 518: Answer and Explanation

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Question: 518

4. A 75 g ice cube is added to 450 g of boiling water. The water stops boiling immediately because:

I. Heat is melting the ice.

II. Condensation is occurring.

III. Phase change occurs.

A. I only
B. II only
C. I and III only
D. II and III only
E. I, II, and III

Correct Answer: C


The correct answer is (C). The heat in the water and any heat added to the water is used by the system to melt the ice. This constitutes a phase change, too.

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