複選題

38. The organic compounds with the formula C₄H₈O
(A) have no optical isomer
(B) have no geometric isomer
(C) can be an unsaturated cyclic ether
(D) can be a tertiary alcohol
(E) can be a saturated secondary alcohol

39. The equilibrium constant K measurements at several different temperatures for a reaction showed the relationship between K and T (in Kelvin): lnK = -1.8 +610×(1/T). Which of the followings is true? (A) This reaction is endothermic (B) The ΔG° of this reaction is +(C) The ΔS° of this reaction is -. (D) The ΔH° of this reaction is . (E) The relationship should be lnK = x/T. The intercept -1.8 must be experimental error. 

40. Given the half reaction: → NO(g), in acidic solution, how many electrons appear in the half-reaction when it is properly balanced? (A) 2 (B) 3 (C) 4 (D) 6 (E) 8

41. Which of the following cations is likely to have the largest exothermic hydration enthalpy? (A) (B) (C) (D) (E)

42. Given that E°() = +0.15 V and E°() = +0.34 V. Then E°() = (A) +0.04 V (B) +0.19 V (C) +0.49 V (D) +0.53 V (E) none of above

43. In the dimerization reaction of compound A, 2A(g) → A2(g), when the concentration of A was doubled, the rate increased by a factor 4. When the initial concentration of A is 0.50 M, it requires 10 min for 75% of A to react. The rate constant k = (A) (B)(C) (D) (E)

44. The HBr synthesis is thought to involve the following reactions: a. Br2 → 2 Br‧ b. Br‧+ H2 → HBr + H‧ c. H‧+ Br2 → HBr + Br‧ d. H‧+ Br‧→ HBr e. 2 Br‧→ Br2 f. 2 H‧→ H2 The chain propagation reactions in this mechanism are reactions (A) a (B) b, c (C) b, d, e (D) d, e, f (E) b, c, d

45. In 1789, a French chemist Claude Louis Berthollet was first to develop a bleach solution by passing chlorine gas through a solution of potassium hydroxide. Now many factories use cheaper sodium hydroxide instead of potassium hydroxide to produce chlorine-based bleach solution. The active agent in the bleach solution mentioned above is potassium/sodium (A) chlorate (B) chlorite (C) hypochlorite (D) perchloride (E) perchlorate 

46. If Eº for the following cell is 0.36 V at 25 °C Pb(s) | PbSO4(s) | -(aq, 0.50 M) || (aq, 0.80 M) | H2(g, 175 kPa) | Pt(s)  The Nernst equation for the cell properly expressed at 25 °C, E = ? (A)(B)(C) (D)(E)

47. Which of the following indicators would be most suitable for the titration of sodium dihydrogen phosphate with 0.10 M sodium hydroxide? For phosphoric acid, = 7.21, and = 12.68. (A) bromocresol green, = 4.7 (B) litmus, = 6.5 (C) bromothymol blue, = 7.1 (D) phenolphthalein, = 9.4 (E) indigo carmine, = 12.2

48. Which of the following statements about the lithium ion batteries used in electronic devices and electric cars is false? (A) Typically, the electrolyte used in Li-ion batteries is aqueous solution of lithium salt. (B) The graphite anode can rapidly and reversibly intercalate Li atoms. (C) LiCoO2 and LiFePO4 are commonly used cathode materials. (D) A Li-ion battery has higher gravimetric energy density than a lead-acid battery. (E) A Li-ion battery has higher volumetric energy density than a lead-acid battery.

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