what do these two changes have in common? a piece of pear turning brown a copper statue turning green select…

what do these two changes have in common? a piece of pear turning brown a copper statue turning green select all that apply. both are only physical changes. both are caused by heating. both are caused by cooling. both are chemical changes.

what do these two changes have in common? a piece of pear turning brown a copper statue turning green select all that apply. both are only physical changes. both are caused by heating. both are caused by cooling. both are chemical changes.

Answer

Brief Explanations:

A piece of pear turning brown is due to oxidation (a chemical reaction with oxygen in the air). A copper statue turning green is due to a chemical reaction between copper, oxygen, water, and carbon - dioxide in the air, forming copper carbonate and other compounds. Both involve chemical reactions that change the chemical composition of the substances.

Answer:

Both are chemical changes.