Question

1. what happens to the total amount of mass during a physical or chemical change?

Explanation:

In both physical and chemical changes, the law of conservation of mass applies. This law states that mass is neither created nor destroyed in a closed system during such changes. So the total amount of mass remains constant (or conserved) as atoms are just rearranged (in chemical changes) or the substance changes state/shape (in physical changes) without adding or removing mass.

Answer:

The total amount of mass remains constant (is conserved) during a physical or chemical change, as mass is neither created nor destroyed (due to the law of conservation of mass).