Question

How does the average potential energy of molecules of substance change during its change in phase at a constant temperature, on heating?

• A. It increases
  
• B. It decreases
  
• C. It does not change
• D. Can't say

Answer 1

The correct option is A It increases

Answer is A

The heat energy added during the phase change is used to overcome some of the forces that hold the molecules together, allowing them to move further away from each other. During the phase change, the added heat energy is stored as potential energy