Why is state change called a physical change?

Correct answer: Chemical identity generally remains same

The direct answer is A: in a state change, the chemical identity generally remains the same. A state change alters the physical form or arrangement of particles. For example, melting ice, boiling water and freezing water change the state of \\(H_2O\\), but do not normally create a different chemical substance. Option A is correct because the change is physical when composition remains unchanged. Option B is wrong: a new element does not always form; ordinary melting and boiling do not form elements. Option C is wrong: atoms do not vanish during a normal state change; they remain present and are rearranged or move differently. Option D is wrong: matter does not always become energy; that is not the description of an ordinary phase change. The word “generally” is important because unusual extreme conditions can involve chemical or nuclear processes, but standard school examples are physical changes. Memory cue: change in state, not identity.