Asubstance that conducts electricity, is malleable, ductile, and has luster would be classified as a a) compound b) element c) metal d) nonmetal

Which best describes the activation energy of a chemical reaction? a. the combined energy of all the reactants b. the amount of energy required for a reaction to occur c. the difference in energy between products and reactants d. the potential energy stored in the bonds of reactants and products