What happens to energy during a change of state why is it a phisycal change?

During a change of state, such as melting or boiling, energy is either absorbed or released by a substance without changing its chemical composition. For example, when ice melts into water, it absorbs heat energy, while when water freezes, it releases heat energy. This process is considered a physical change because it affects the form of the substance but not its chemical identity; the molecules remain the same throughout the change.