22. Which of the following compounds exhibits only dispersion and dipole-dipole intermolecular interactions?
(A) H₂
(B) HI
(C) CO₂
(D) CH₃NH₂

23. Which of the following compounds will be most soluble in ethanol (CH3CH2OH)? (A) trimethylamine (N(CH3)3) (B) acetone (CH3COCH3) (C) ethylene glycol (HOCH2CH2OH) (D) hexane (CH3CH2CH2CH2CH2CH3)

24. Which of the following ions should have the most exothermic ΔHhydration? (A) (B) (C) (D)

25. Given the following proposed mechanism, predict the rate law for the overallreaction.2NO2 + Cl2 → 2NO2Cl (overall reaction)  Mechanism  NO2 + Cl2 → NO2Cl + Cl slowNO2 + Cl → NO2Cl fast(A) Rate = k[NO2][Cl2] (B) Rate = k[NO2]2[Cl2](C) Rate = k[NO2][Cl] (D) Rate = k[NO2Cl][Cl]

26. Identify an homogeneous catalyst. (A) SO2 over vanadium (V) oxide (B) Pd in H2 gas (C) Pt with methane (D) H2SO4 with concentrated HCl

27. Consider the following reaction and its equilibrium constant: I2(g) ⇌ 2I(g) Kp = 0.209 A reaction mixture contains 0.89 atm I2 and 1.77 atm I. Which of the following statements is TRUE concerning this system? (A) The reaction will shift in the direction of reactants. (B) The reaction quotient will increase. (C) The reaction will shift in the direction of products. (D) The equilibrium constant will decrease.

28. Consider the following reaction at equilibrium. What effect will increasing thetemperature have on the system?C3H8(g) + 5 O2(g) ⇌ 3 CO2(g) + 4 H2O(l) ΔH° = -2220 kJ(A) The reaction will shift to the right in the direction of products.(B) The reaction will shift to the left in the direction of reactants.(C) The equilibrium constant will increase.(D) The equilibrium constant will decrease.

29. Which of the following is a STRONG base? (A) Cl- (B) NH3 (C) CH3OH (D) KOH

30. Which one of the following salts, when dissolved in water, produces the solution with the most acidic pH? (A) NaCl (B) KCl (C) MgCl2 (D) AlCl3

31. If the pKa of HCHO2 is 3.74 and the pH of an HCHO2/NaCHO2 solution is 3.89, which of the following is TRUE? (A) [HCHO2] ＜ [NaCHO2] (B) [HCHO2] = [NaCHO2] (C) [HCHO2] ＞ [NaCHO2] (D) [HCHO2] ＞＞ [NaCHO2]

32. When titrating a strong monoprotic acid and KOH at 25°C, the (A) pH will be less than 7 at the equivalence point. (B) pH will be greater than 7 at the equivalence point. (C) titration will require more moles of base than acid to reach the equivalence point. (D) pH will be equal to 7 at the equivalence point.

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