Which of the following statements is/are true? select all that apply. a. the entropy of the starting materials for a reaction is always greater than the entropy of the products. b. the entropy of the products of a reaction is always greater than the entropy of the starting materials. c. the amount of useable energy resulting from a reaction is always less than the total energy available in the starting materials. d. the energy of the starting materials for a reaction equals the sum of the product energies plus energy released as heat and disorder.