What is always true according to the Law of Conservation of Matter?

Question

A. atoms created during a chemical reaction must have the same mass as the atoms in the reactants

B. atoms can be rearranged during a chemical reaction but cannot be added or taken away

C. new molecules cannot be formed from the reactants during a chemical reaction

D. the total of number of molecules before and after a chemical reaction stays the same

Answer 1

According to the Law of Conservation of Matter, the correct statement is:

B. atoms can be rearranged during a chemical reaction but cannot be added or taken away.

This law states that matter cannot be created or destroyed in a closed system, so the total number of atoms remains constant, although they can rearrange to form different molecules.