Question

what happens during a chemical change? composition stays the same. composition changes. mass is lost.

Explanation:

A chemical change involves the transformation of substances. During this process, the composition of the substances changes as new substances are formed. This is a fundamental concept in chemistry. The law of conservation of mass states that mass is not lost in a chemical reaction. And if the composition stayed the same, it would be a physical change, not a chemical one.

Answer:

Composition changes.