Quick! question 10
in a chemical reaction, how does the total mass of the products compare to the total mass of the reactants

The answer is A, they are always equal.

As seen in the Law of Conservation of Mass/Energy, Matter can be neither created nor destroyed. You can't get more matter through a reaction just as you can't make that matter simply disappear. Because atoms are only rearranged in a chemical reaction, there must be the same number of atoms in both the reactants and the products.

I hope this helps you out! Good luck!