Question

Breaking chemical bonds ______ energy.

Forming chemical bonds _______ energy.

If the energy needed to break the bonds in the reactants at the beginning of a reaction is less than the energy released when the new bonds are formed in the products at the end of the reaction, the reaction is _________.

If the energy released when the products are formed at the end of the reaction is less than the energy needed to break the bonds in the reactants at the beginning of the reaction, the reaction is _________.