Question

17. Which of the following statements is true? A) Rate equations that contain concentration terms includes all reactants involved in a multi-step reaction. B) Rate equations that contain concentration terms includes all reactants involved in a one-step mechanism. C) Fast reactions have small rate constants and small activation energies. D) Slow reactions have large rate constants and small activation energies. E) The rate of the reaction is never affected by the energy of intermediates. 18. Which of the following makes the statement about a catalyst true? A catalyst accelerates a reaction by A) raising the energy of activation. B) lowering the equilibrium constant. C) changing the amount of reactant and product at equilibrium D) providing a pathway with a lower energy of activation. E) making the reaction more exothermic. 19. If the conversion of A to B is slow and B to C is fast, what is the rate equation for this reaction? +Cl + H-C step 1 step 3 step 2 C) Rate = k((CH)CH.] A) Rate = kl(CH)2CH'][H2O] D) Rate H(CH) CHCIH O B) Rate-k((CH)CHCl] 20. A solution containing 0.4 g/mL of a pure S enantiomer in a 1 dm polarimeter rotates plane polarized light by +5.6°. What is the rotation of a solution containing 0.8 g/mL of the R enantiomer in the same polarimeter if Tobserved E)-11.2° D)-56" C)+11.2° BH5.6" A)+23°