Question

5. Examine the phase change diagram below.




According to the diagram...
A:neither the temperature nor the amount of heat energy change when there is a phase change
B:only the temperature changes when there is a phase change.
C:only the amount of heat energy changes when there is a phase change.
D:the temperature and the amount of heat energy change when there is a phase change.

Answer 1

If you look at the diagram and look where there is a phase change, examine the temperature line, is it going up? is it going down or is it staying the same?

Now look at the energy (x - axis), if the line moves to the right it means it's increasing. So is it moving more to the left? (meaning increasing) is it stopped?

Based on that observation, you can make an assumption.

Answer 2

You know what a phase change is right? It is when between change of state from Solid to Liquid, from liquid to Steam etc..