During all chemical reactions, charge, mass and anergy are

Law of conservation of Mass states that mass can neither be created nor be destroyed but it can only be transformed from one form to another form.
This also means that in a balanced chemical reaction total mass on the reactant side must be equal to the total mass on the product side.
Law of conservation of energy states that energy can neither be created nor be destroyed but it can only be transformed from one form to another form.The total energy of an remains constant in a chemical reaction

Ithink is a because if say increased in electronegativity

16- counting by fours