Answer to Question #199166 in General Chemistry for Aracely

Question

Why would reactants at the beginning of a chemical reaction weigh the same as the product at the end?

Answer 1

This is because no atoms are added or taken away from the system, so the mass stays the same. Even in a chemical reaction when atoms interact and create new products, mass is conserved. This is because the new substances created are composed of atoms that were present in the reactants.