Question

What does the Law of Conservation of Mass say about a chemical reaction?

in a chemical reaction, mass is neither created nor destroyed
to balance a chemical equation, additional mass may be created
mass is not measurable in a chemical reaction
mass increases as atoms are rearranged during a chemical reaction

Answer 1

The Law of Conservation of Mass states that in a chemical reaction, mass is neither created nor destroyed. This means that the total mass of the reactants (the substances that start the reaction) is equal to the total mass of the products (the substances formed by the reaction). Hence, to balance a chemical equation, the number of atoms of each element must be the same on both sides of the equation, but additional mass is not created.