Question

what do these two things have in common?

• roasting a marshmallow over an open fire
• a copper statue turning green

a both are caused by heating
b both are chemical changes
c both are caused by cooling
d both are physical changes

Explanation:

Roasting a marshmallow over an open - fire causes a chemical change as the marshmallow's molecules are broken down and new substances are formed. A copper statue turning green is due to a chemical reaction (oxidation) between copper, oxygen, water, and carbon dioxide in the air, forming a new substance (copper carbonate). So, both are chemical changes.

Answer:

B. Both are chemical changes