Question

the law of ___ of mass states that mass is neither _ nor destroyed. in other words, the atoms in the reactants at the beginning of a chemical reaction will equal the atoms in the products at the end of the reaction. this is why we must ___ chemical reactions.
balance
conservation
created

Explanation:

The Law of Conservation of Mass states mass is conserved in chemical reactions, not created or destroyed, and this requires balancing chemical reactions.

Answer:

The first blank: Conservation; The second blank: Created; The third blank: Balance