Question

what will weigh more when a chemical change is complete? the reactants before the chemical reaction, or the product after the reaction is complete?
the product always weighs more than the reactant
they both will lose mass after the reaction
the reactant will weigh more than the product
they both will weigh the same

Explanation:

According to the law of conservation of mass, in a chemical reaction, mass is neither created nor destroyed. This means the total mass of the reactants before the reaction is equal to the total mass of the products after the reaction.

Answer:

They both will weigh the same.