Question

if you compare the mass of a substance before and after a chemical change, what will you find? the mass will be greater. the mass will be smaller. the mass will stay the same.

Explanation:

According to the law of conservation of mass in chemistry, in a chemical change (chemical reaction), the total mass of the reactants equals the total mass of the products. No mass is created or destroyed, only rearranged.

Answer:

The mass will stay the same.