In a chemical reaction, atoms are rearranged to form new molecules. However, atoms are neither created nor destroyed. What happens to the total mass of the atoms involved in a chemical reaction?
A.
It will stay the same no matter how the atoms are rearranged.
B.
It will increase if a new compound is formed during the reaction.
C.
It will decrease if two molecules combine to form a single compound.
D.
It always changes as the atoms are rearranged into new molecules.