Answer: Heat of reaction
Step-by-step explanation:
Change in entropy is the difference between the entropy of products and the entropy of reactants.
Heat of reaction is the energy released or absorbed during the course of the reaction. It is difference between the potential energy of the products and the potential energy of the reactants.
Activation energy is the extra energy that must be supplied to reactants in order to cross the energy barrier and thus convert to products.
Reaction complex is the short lived intermediate formed when reactants are coverted to products.