10. Which of the following is close to the typical bond energy of a covalent bond?(A) 1 Kcal/mol (B) 10 Kcal/mol (C) 100 Kcal/mol (D) 1000 Kcal/mol

19. Which factors are equal in a reversible chemical reaction that has reached equilibrium?(A) The number of moles of the reactants and products(B) The potential energies of the reactants and products(C) The activation energies of the forward and reverse reactions(D) The rates of reaction for the forward and reverse reactions