The above graph is a phase change diagram for water. At points B and D the water is going through a phase change. During the phase changes, what is happening to the temperature and the heat energy?

Question

Type Answer HERE:

The temperature and the heat energy are increasing during a phase change.

The temperature remains constant and the heat energy is increasing during a phase change.

The temperature is increasing and the heat energy remains constant during a phase change.

The temperature and the heat energy remain constant during a phase change.

Answer 1

The correct answer is:

The temperature remains constant and the heat energy is increasing during a phase change.

During phase changes, such as melting or boiling, the temperature of the substance does not change as heat energy is added; instead, that energy goes into changing the state of the substance.