Answer: chemical change.
Explanation:-
A physical change is defined as a change in which there is alteration in shape, size etc. No new substance gets formed in these reactions.
Example: Melting of ice
Physical property is defined as the property of a substance which becomes evident during physical changes. Example: Melting point
A chemical change is defined as a change in which a change in chemical composition takes place. A new substance is formed in these reactions.
Example: Corrosion of iron called as rusting.

Chemical property is defined as the property of a substance which becomes evident during chemical changes. Example: Reactivity with other substances