When a solid melts,
A) the temperature of the substance increases.
B) the temperature of the substance decreases.
C) heat energy leaves the substance.
D) heat energy enters the substance.

Question

Quizplus · Accepted Answer

When a solid melts, it goes through a phase change from a solid to a liquid. During this process, heat energy must be added to the substance to break the intermolecular forces holding the solid together. As a result, the heat energy enters the substance, causing the temperature to remain constant until all of the solid has melted. Therefore, the correct choice is D - heat energy enters the substance.

When a Solid Melts