Which parts must be balanced in a chemical equation? (1 point)

energy on the reactant and product sides
states of reactants and products
numbers of reactant and product molecules
numbers of reactant and product atoms

1 answer

In a chemical equation, the part that must be balanced is the numbers of reactant and product atoms. This is because the Law of Conservation of Mass states that atoms cannot be created or destroyed in a chemical reaction, so the total number of atoms of each element must be the same on both sides of the equation.