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The particles also have different amounts of energy when the substance is in different states. For example, particles in liquid water have more energy than particles in ice. To change a substance from one state to another, you must add or remove energy.
Therefore,:. When a substance changes phase (state) there is no change in temperature. So the average kinetic energy of the molecules remain the same. And thus, the average speed of the molecules remain the same.The heat causing change in phase is used in changing the molecule's potential energy.eat, which is energy, either comes into the material during a change of phase or heat comes out of the material during this change. However, although the heat content of the material changes, the temperature does not. Remember that heat is energy, and remember that there are two types of energy-kinetic and potential.