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

22. Of the statements below, which one can best explain why CH4 is a gas at STP, while C8H18 is a liquid and C20H42 is a solid? (A) C20H42 has the greatest ionic interaction between its molecules. (B) C8H18 has a greater amount of hydrogen bonding than CH4 or C20H42. (C) There is more dipole-dipole interaction between molecules of greater mass. (D) There are more Van der Waals (dispersion) forces between nonpolar molecules that are greater in mass.

相關試題

相關試卷