Melting ice is a physical change because it does not involve any alteration in the chemical composition of the substance. According to the text, physical changes "involve a change in state, such as a change from a solid to a liquid, without changing the chemical composition of the substance." When ice melts, it simply changes from a solid state to a liquid state, but the chemical composition of water (H2O) remains the same. Therefore, melting ice is considered a physical change.
