Question

which option is an example of a chemical change?
a dicing an onion
b mixing a salad dressing
c preparing a salad
d digesting a salad

Explanation:

A chemical change results in the formation of new substances. Digesting a salad involves chemical reactions in the body to break down food into nutrients, forming new substances. Chopping an onion, mixing salad - dressing, and preparing a salad are physical changes as no new substances are formed.

Answer:

D. digesting a salad