Achemical reaction involves the rearrangement of atoms to form new molecules. during a chemical reaction, however, atoms are neither created nor destroyed. which of the following is true about the atoms involved in a chemical reaction? a. the total mass of the atoms involved in a chemical reaction always changes as the atoms are rearranged into new molecules. b. the total mass of the atoms involved in a chemical reaction will stay the same no matter how the atoms are rearranged. c. the total mass of the atoms involved in a chemical reaction will increase if a new compound is formed during the reaction. d. the total mass of the atoms involved in a chemical reaction will decrease if two molecules combine to form one single compound.