Question

What happens when a substance undergoes a physical change?

Answer 1

Answer: A physical change in a substance doesn't change what the substance is. In a chemical change where there is a chemical reaction, a new substance is formed and energy is either given off or absorbed.

Answer 2

When a substance undergoes a physical change, there is a change of state coupled with the release or absorbtion of energy.

Step-by-step explanation:

A physical change is a reversible transformation of an object from one form to another that can be observed. In this case, it occurs majorly when an object releases or absorbs a definite amount of energy (e.g heat). It does not affect the chemical composition of the object.