Answer :
Answer: c. Broiling a steak on a grill
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: Boiling water which involves phase change from liquid to gas.
Melting of wax which involves phase change from solid to liquid.
Condensing water vapor into rainfall which involves phase change from gas to liquid.
Carving a piece of wood which involves a change in shape.
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: Broiling a steak on a grill which involves combustion and a change in chemical composition.