Question

During a change of state, the average kinetic energy of molecules...Select one:a. increases.b. decreases.c. increases or decreases depending on the substance.d. stays the same.

Answer 1

During a change of state the temperature of the substance remains the same; since the temperature measures the average kinetic energy of the atoms of the substance, we conclude that the average kinetic energy stays the same; therefore, the answer is d.