Question

what happens to the mass of substances during a chemical reaction?

oa mass is lost.

ob mass is gained.

oc mass is not gained or lost.

od mass is both gained and lost.

Explanation:

According to the law of conservation of mass in a chemical reaction, the total mass of reactants is equal to the total mass of products. This means that mass is neither created (gained) nor destroyed (lost) during a chemical reaction.

Answer:

C. Mass is not gained or lost.