In a decomposition reaction:    A. the reactants are usually a metal and a nonmetal    B. one of the reactants is often water    C....

In a decomposition reaction:
   A. the reactants are usually a metal and a nonmetal

   B. one of the reactants is often water

   C. the reactants are generally two ionic compounds in aqueous solution

   D. energy in the form of heat or light is often produced