Question

What do these two changes have in common?

a copper statue turning green
baking an apple pie

Select all that apply.

A. Both are only physical changes

B. Both are chemical changes

C. Both are caused by heating

D. Both are caused by cooling

Answer 1

The corrosion of a copper statue and the baking of an apple pie both involve chemical changes as new substances are formed through various reactions, including oxidation and caramelization respectively.

Step-by-step explanation:

Both the corrosion of a copper statue that leads to it turning green and the baking of an apple pie involve chemical changes. In the case of the copper statue, the green patina that forms is due to a chemical reaction between copper and elements in the environment, such as oxygen and sulfides, leading to the formation of various copper compounds like copper carbonate and copper sulfate. This process is similar to the rusting of iron and is known as corrosion which is a chemical change. On the other hand, baking an apple pie also involves chemical changes; as the pie is heated in the oven, the ingredients undergo chemical reactions that alter their structure and form new substances, such as the caramelization of sugars and the gelatinization of starches.