Check my answer, .

what does conserving mass mean in a chemical equation?

1) there is an equal number of each type of atom on the reactant and product side.
2) there is an unequal number of each type of atom on both sides of the equation.
3) there are more of each type of atom on the product side than on the reactant side.
4) there are more of each type of atom on the reactant side than on the product side.