When a substance changes phase,from solid to liquid or liquid to vapor and vice versa,there is no change in temperature,even though heat is being added or removed.Why is there no change in temperature?
A)During a phase change,energy is used to break/establish the intermolecular bonds rather than stored as kinetic energy of the molecules.
B)During a phase change,temperature is not well defined since there are two phases involved.
C)During a phase change,energy is needed to overcome the gravitational pull.
D)During a phase change,the temperature measured is the last temperature of the measuring device.
E)none of the above

Question

Quizplus · Accepted Answer

During a phase change, the energy supplied or removed is used to break or establish the intermolecular forces between the molecules rather than increase or decrease the kinetic energy of the molecules. This explains why there is no change in temperature during a phase change.

When a Substance Changes Phase,from Solid to Liquid or Liquid