Which of these is an example of a chemical change? a. leaving cheese out to get moldy b. smelling sprayed perfume c. feeling the ice melt on your skin d. crushing ice with a hammer

A. Leaving Cheese out to get moldy

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: Smelling Sprayed perfume : It is only diffusion of gas.

Feeling the ice melt on your skin: It is only change of state.

Crushing ice with a hammer: It is only change of 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: Leaving Cheese out to get moldy : It involves oxidation of cheese to form new substances.

Thus  Leaving Cheese out to get moldy is a chemical change.

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i believe the answer is a.