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52. Which will form a buffer solution?(A) HBr and NaOH (D) H 2CO 3and NaHCO 3(B) HCl and NH 4Cl (E) H 3PO 4and Na 3PO 4(C) HNO 3and NaNO 353.AP Chemistry Sample Exam56. Which reaction has the largest decrease in entropy?(A) H 2O(l) → H 2O(s)(B) N 2(g) +3 H 2(g) → 2 NH 3(g)(C) H 2(g) + I 2(g) → 2 HI(g)(D) I 2(s) → I 2(g)(E) C charcoal → C graphite57. 4 HCl(g) + O 2(g) →2 Cl 2(g) + 2 H 2O(g)The above reaction is not spontaneous at 700 K but is atlower temperatures. Which of the following describes thereaction at 700 K?(A) ∆G, ∆Η, and ∆S are positive(B) ∆G, ∆Η, and ∆S are negative(C) ∆G and ∆S are negative; ∆Η is positive(D) ∆G and ∆Η are negative; ∆S is positive(E) ∆G and ∆S are positive; ∆Η is negativeThe above chart contains experimental data obtained fromthe following reaction:H 2+ 2ICl →I 2+ 2HClWhat is the experimental rate law for this reaction?(A) Rate = k[H 2]/[ICl] (D) Rate = k[H 2] 2 [ICl] 2(B) Rate = k[H 2][ICl] (E) Rate = k[H 2] 2 [ICl](C) Rate = k[H 2][ICl] 254. The heat of comubstion for CH 6O 2N 2(g) is –98 kcal.CH 6O 2N 2(g) + 5/2 O 2(g) → CO 2(g) + 2 NO 2(g) +3 H 2O(g)What is the heat of formation for CH 6O 2N 2(g)?(A) –216 kcal(D) +124 kcal(B) –182 kcal(E) –124 kcal(C) 182 kcal55. 12O 2(g) + H 2(g) → H 2O(g) + 243 kJ12O 2(g) + 2H(g) → H 2O(g) + 661 kJGiven the above two equations, how much energy isneeded to dissociate 1.00 mole of H 2according to theequation below?H 2(g) → 2H(g)(A) 243 kJ(D) 904. kJ(B) 418 kJ(E) 1320 kJ(C) 661. kJ58. Which compound dissolves in water to form a clearsolution?(A) CrCl 2(D) CoCl 2(B) LiCl (E) NiCl 2(C) FeCl 359. Which of the following is true about the halogens?(A) Fluorine is the least electronegative element.(B) Bromine liberates free chlorine from a solution ofchloride ions.(C) Ionization energy increases with increasing atomicnumber.(D) Fluorine has the smallest atomic radius.(E) They combine with Group I metals to formcompounds of the form XY 2.60. Base your answer to the following question on the atomicnumbers given below(A) 9(B) 10(C) 46(D) 51(E) 84Which element does not form compounds?(A) A(D) D(B) B(E) E(C) C61. Which of the following substances has the smallest dipolemoment?(A) HF(D) HCN(B) NaCl(E) H 2O(C) SF 662. The solution with the highest pH is(A) 1.0 M NaCl (D) 1.0 M Na 2SO 3(B) 1.0 M NaCN(E) 1.0 M NaF(C) 1.0 M NaIO 3Page 6
63. The pressure on a sample of gas is increased from 100 kPato 130 kPa at constant temperature. Which of thefollowing increases?I. The density of the gasII. The average distance between moleculesIII. The average speed of the molecules.(A) I only(D) I and II only(B) III only(E) I, II, and III(C) I and III only64. The temperature of a sample of xenon atoms is raised from50 o C to 90 o C. Which of the following statements is trueabout the average kinetic energy of the atoms?(A) The average kinetic energy does not change.(B) The average kinetic energy of the sample increased bya factor of 363/323.(C) The average kinetic energy of the sample increased bya factor of 9/5.(D) The average kinetic energy increased by a factor of81/25.(E) More information is needed to know whether theaverage kinetic energy changed.65. Of the following organic compounds, which is LEASTsoluble in water at 298 K?(A) C 6H 6, benzene(B) CH 3Cl, chloromethane(C) C 2H 5OH, ethanol(D) C 2H 5COOH, propanoic acid(E) C 5H 10O 5, fructose66. Cr 2O 7 2– + 6Br – + 14H + → 2Cr 3+ + 3Br 2+ 7H 2OIn a redox titration, 15.58 mL of 0.125 M Cr 2O 2– 7wasneeded to completely oxidize the Br – in a 25.00 mL sampleof NaBr. What is the [Br – ] in the original solution?(A) 1.95 × 10 –3 M(D) 6.21 × 10 –5 M(B) 4.67 × 10 –1 M(E) 7.18 × 10 –6 M(C) 5.22 × 10 –4 MAP Chemistry Sample Exam68. Two cells, one containing MnCl 3and the other containingCuNO 3are connected in series. How much copper isdeposited in the time that 82.5 g of manganese isdeposited.(A) 54.0 g(D) 324.0 g(B) 108.0 g(E) 648.0 g(C) 162.0 g69. NH 4 + (aq) + H 2O ↔ H 3O + (aq) + NH 3(aq)When a few drops of HCl are added,(A) both the [NH 3] and the [NH 4 + ] increase(B) both the [NH 3] and the [NH 4 + ] decrease(C) the [NH 3] decreases and the [NH 4 + ] increases(D) the [NH 3] increases and the [NH 4 + ] decreases(E) the [NH 3] increases and the [NH 4 + ] remains constant70. When added to water, the hydrogen carbonate ion producesa solution which is(A) basic because K bis greater than K a(B) basic because K ais greater than K b(C) acidic because K bis greater than K a(D) basic because K ais greater than K b(E) acidic because K ais equal to K b71. HMo + H 2O ↔ H 3O + + Mo –72.Which relationship is true at the transition point for methylorange indicator (HMo)?(A) [HMo ] > [Mo – ] (D) [HMo] ↔ [H 3O + ](B) [HMo] = [Mo – ] (E) [HMo] > [H 3O + ](C) [HMo] < [Mo – ]67. Why does an abrupt color change take place whenphenolphthalein is used as an indicator in the titration of astrong acid and a strong base?(A) When enough base is added to the solution,phenolphthalein acts as a catalyst for the color change.(B) Phenolphthalein changes the rate of reaction, causing acolor change.(C) As the solution being titrated approaches its end point,a large change in pH takes place.(D) The phenolphthalein is consumed by the strong baseand is removed from the titration.(E) Since phenolphthalein is strong base, it changes colorwhen it reacts with another strong base.Which is the “rate determining step” for the abovehypothetical reaction mechanism of the overall reaction A→ E?(A) step 1(B) step 2(C) step 3(D) step 4(E) the rate determining step cannot be determinedPage 7
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