Chemical weathering

a. is caused by freezing and thawing
b. breaks apart rocks by physical processes
c. occurs when chemical reactions dissolve or change the minerals in rocks
d. none of above

c. occurs when chemical reactions dissolve or change the minerals in rocks

Chemical weathering occurs when chemical reactions dissolve or change the minerals in rocks.

Explanation:

Chemical weathering refers to the process by which rocks break down with the use of chemical means which include: enzymes, bacteria or acids.

Weathering refers to the process through which rocks and minerals on the earth surface breaks down. Agents of weathering include: ice, water, salts, plants, acids, animals and so on.