Page 1. Spring 2002 Final Exam Review Palmer Graves, Instructor MULTIPLE CHOICE

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1 Page 1 MULTIPLE CHOICE 1. Which one of the following exhibits dipole-dipole attraction between molecules? a) XeF b) AsH c) CO d) BCl e) Cl 2. What is the predominant intermolecular force in AsH? a) London-dispersion forces b) ion-dipole attraction c) ionic bonding d) dipole-dipole attraction e) hydrogen-bonding 3. Hydrogen bonding is a special case of. a) London-dispersion forces b) ion-dipole attraction c) dipole-dipole attractions d) none of these e) ion-ion interactions 4. The heat of fusion of water is 6.01 kj/mol. The heat capacity of liquid water is 75.2 J/mol-K. The conversion of 50.0 g of ice at 0.0 C to liquid water at 22.0 C requires kj of heat. a) b) 21.3 c) 17.2 d) e) Insufficient data is given.

2 Page 2 5. The phase diagram of a substance is given below. The region that corresponds to the solid phase is. a) w b) x c) y d) z e) x and y 6. What is the molarity of an aqueous sodium chloride solution that is 13.0% sodium chloride by mass and that has a density of 1.10 g/ml? a) 143 b) 2.45 c) 2.56 d) 2.23 e) Which produces the greatest number of ions when one mole dissolves in water? a) NaCl b) NH NO c) NH Cl d) Na SO e) sucrose 8. In the reaction 2NO 2NO + O at 300 C, [NO ] drops from to M in 100 s. The rate of appearance of O for this period is M/s. a) b) c) d) e)

3 Page 3 9. Given the data below for the reaction yy + zz products the rate law is rate =. Experiment Initial Number [Y]/M [Z]/M Rate (M/s) a) k[y][z] b) k[y] [Z] c) k[y] [Z] d) k[y][z] e) k[y] [Z] 10. The rate constant for a particular reaction is M s at 150 C, and M s at 200 C. What is the energy of activation for this reaction at 250 C? a) 132 b) 56 c) 99 d) 71 e) The reaction 2NO 2NO + O follows second-order kinetics. At 300 C, [NO ] drops from to M in 100 s. Use of the integrated form of the proper rate equation affords a value of L/mol s for the rate constant k. a) b) 0.65 c) 0.81 d) 1.2 e) The reaction CH -N C CH -C N is a first-order reaction. At C, k = s. If [CH -N C] is M, [CH -N C] in M after s is a) b) c) d) e) The activation energy of a reaction whose rate constant increases by a factor of 10.0 when the temperature is increased from 303 K to 333 K is kj. a) 30 b) 33 c) 46 d) 64 e) 89

4 Page At a certain temperature, a flask at equilibrium contains M HCl, M Cl, and M H. What is the value of K c for the equilibrium: 2 HCl(g) Cl (g) + H (g)? a) b) 11.0 c) d) e) The value of K c for the equilibrium H (g) + I (g) 2 HI(g) is 794 at 25 C. At this temperature, what is the value of K c for 1/2 H (g) + 1/2 I (g) HI(g)? a) 397 b) c) 28 d) 1588 e) Consider the reaction shown below: N O (g) 2NO (g) Determine the value of the equilibrium constant for this reaction if an initial concentration of N O (g) of mol/l is reduced to mol/l at equilibrium. There is no NO (g) present at the start of the reaction. a) 0.87 b) 13 c) 0.22 d) e) For the vapor-phase reaction 2AZ A + Z K c = 16 at 523 K. If mol AZ is introduced into an evacuated 1.00 L vessel at 523 K, then at equilibrium [Z ] is M. a) b) c) d) 0.24 e) Consider the following reaction at equilibrium: 2NH (g) N (g) + 3H (g) H = kj Adding N (g) to the system at equilibrium will. a) decrease the concentration of NH (g) at equilibrium b) decrease the concentration of H (g) at equilibrium c) increase the value of the equilibrium constant d) cause the reaction to shift to the right e) remove all of the H (g)

5 Page What is the ph of a M solution of barium hydroxide? a) b) c) 1.82 d) e) What is the ph of an aqueous solution at 25 C in which [OH ] is M? a) b) c) d) e) Calculate the concentration (in M) of hydronium ions in a solution at 25 C with a poh of a) b) c) d) e) The ph of a M NaOH solution at 25 C is. a) 1.96 b) 4.51 c) d) e) The [H ] and ph of a M HNO solution at 25 C are M and, respectively a) , b) , c) 0.021, d) 0.021, e) , Of the following, is a weak acid. a) HF b) HCl c) HBr d) HNO e) HClO 25. HZ is a weak acid. An aqueous solution of HZ is prepared by dissolving mol of HZ in sufficient water to yield 1.00 L of solution. The ph of the solution was 4.93 at 25 C. The K a of HZ is. a) b) c) d) e)

6 Page The ph of a 0.15 M aqueous solution of HOAc at 25 C is. The K a for HOAc is a) 5.57 b) 7.35 c) 2.78 d) 9.18 e) The ph of a 0.10 M solution of a weak base is What is the K b for this base? a) b) c) d) e) Calculate the poh of a M aqueous sodium cyanide solution at 25 C (for CN, K b = ). a) 9.31 b) c) 5.20 d) 1.08 e) A solution containing which one of the following pairs of substances will be a buffer solution? a) NaI, HI b) KBr, HBr c) RbCl, HCl d) CsF, HF e) none of these 30. Calculate the ph of a solution prepared by dissolving 0.37 mol of formic acid (HCO H) and 0.23 mol of sodium formate (NaCO H) in 1.00 L of solution. K a = for formic acid. a) 2.09 b) c) 3.54 d) 2.30 e) Consider the titration of ml of M HClO with M KOH. The H O concentration after addition of 10.0 ml of KOH is M. a) b) c) d) e) Consider the titration of 25.0 ml of M HClO with M KOH. The H O concentration after addition of 66.2 ml of KOH is M. a) b) c) d) e) 0.273

7 Page The ph of a solution prepared by mixing 45 ml of M KOH with 65 ml of M HCl is. a) 1.31 b) 2.92 c) 0.74 d) 1.97 e) What is the molarity of an HOAc solution if 25.5 ml of this solution required 37.5 ml of M NaOH to reach the equivalence point? a) b) c) d) e) The ph at the equivalence point of an HOAc solution if 25.5 ml of this solution required 37.5 ml of M NaOH to reach the equivalence point is closest to. a) 4 b) 7 c) 9 d) 12 e) ml of M HF is titrated with M NaOH. What is the ph when ml of base have been added? (K a for HF is ) a) b) c) d) e) Given the following table of K s p values, determine which compound listed has the smallest solubility. compound K s p CdCO Cd(OH) AgI Fe(OH) 4 10 ZnCO a) ZnCO b) Cd(OH) c) CdCO d) AgI e) Fe(OH) 38. Calculate the molar solubility of silver carbonate (K s p = ). a) b) c) d) e)

8 Page Given the following table of thermodynamic data, substance H f S I (g) kj/mol J/mol-K I (s) determine the normal sublimation point (in C) of iodine. a) b) c) d) e) Some standard entropies (at 25 C in J/mol K) are given: Ca (aq) -55.2, F (aq) -9.6, CaF (s) S for the reaction CaF (s) Ca (aq) + 2F (aq) at 25 C in J/K is. a) b) c) -5.5 d) e) Given the following table of thermodynamic data, substance S C H (g) J/mol-K C H (g) C H (g) H (g) determine the S (in J/mol-K) for the reaction: C H (g) + H (g) C H (g) a) b) c) d) e)

9 Page Consider the following table of thermodynamic data. All values are tabulated for 25 C. Substance G (kj/mol) S (J/mol K) f C H (g) C H (g) C H (g) H (g) H O(g) C H OH(l) What is the value of H (in kj) for the reaction described below? Assume the reaction is performed at 25 C. a) -173 b) 236 c) -311 d) -248 e) 149 C H (g) + 2H (g) C H (g) 43. Consider the following table of thermodynamic data. Substance G (kj/mol) S (J/mol K) f NO(g) NO (g) NOCl(g) N O(g) Determine the value of G (kj) for the following reaction taking place at 25 C. 2NO(g) + O (g) 2NO (g) a) b) c) d) e) insufficient information is given 44. Consider the following reaction at 25 C. C(s) + H O(g) CO(g) + H (g) G = 91.2 kj H = kj What is the value of S (J/K) for this reaction at 25 C? a) -135 b) 1.6 c) -1.6 d) 135 e) 223

10 Page Determine the value of G (kj) for the following reaction using data from the table below. 2H O(g) + O (g) 2H O (g) Substance G (kj/mol) f a) -246 b) 666 c) 246 d) -666 e) More data are needed. H O(g) -228 H O (g) Consider the reaction: Ag (aq) + Cl (aq) AgCl(s) Given the following table of thermodynamic data, substance H f S Ag (aq) kj/mol J/mol-K Cl (aq) AgCl(s) determine the value of G (in kj/mol) for the reaction at 25 C. a) b) c) d) e) Consider the following reaction. A + B C This reaction will always be spontaneous if H is and S is. a) +, + b) -, - c) -, + d) +, - e) +, The equilibrium constant for a reaction is 0.48 at 25 C. What is the value of G (kj) at this temperature? (R = J/K mol) a) 1.8 b) -4.2 c) d) 4.2 e) More information is needed. (c) 2000 Prentice-Hall, Inc. All rights reserved.

11 ANSWER KEY FOR TEST UNTITLED Page 1 1. b 2. d 3. c 4. b 5. a 6. b 7. d 8. a 9. b 10. d 11. e 12. a 13. d 14. b 15. c 16. a Chapter: 11 QUESTION: 9 Chapter: 11 QUESTION: 10 Chapter: 11 QUESTION: 27 Chapter: 11 QUESTION: 50 Chapter: 11 QUESTION: 74 Chapter: 13 QUESTION: 71 Chapter: 13 QUESTION: 91 Chapter: 14 QUESTION: 3 Chapter: 14 QUESTION: 29 Chapter: 14 QUESTION: 42 Chapter: 14 QUESTION: 45 Chapter: 14 QUESTION: 46 Chapter: 14 QUESTION: 78 Chapter: 15 QUESTION: 24 Chapter: 15 QUESTION: 31 Chapter: 15 QUESTION: 61

12 ANSWER KEY FOR TEST UNTITLED Page b 18. b 19. a 20. c 21. b 22. c 23. c 24. a 25. b 26. c 27. b 28. c 29. d 30. c 31. a 32. b Chapter: 15 QUESTION: 67 Chapter: 15 QUESTION: 74 Chapter: 16 QUESTION: 18 Chapter: 16 QUESTION: 23 Chapter: 16 QUESTION: 30 Chapter: 16 QUESTION: 40 Chapter: 16 QUESTION: 47 Chapter: 16 QUESTION: 58 Chapter: 16 QUESTION: 60 Chapter: 16 QUESTION: 67 Chapter: 16 QUESTION: 87 Chapter: 16 QUESTION: 97 Chapter: 17 QUESTION: 14 Chapter: 17 QUESTION: 24 Chapter: 17 QUESTION: 49 Chapter: 17 QUESTION: 50

13 ANSWER KEY FOR TEST UNTITLED Page d 34. c 35. c 36. e 37. e 38. a 39. c 40. d 41. a 42. c 43. a 44. d 45. c 46. c 47. c Chapter: 17 QUESTION: 59 Chapter: 17 QUESTION: 61 Chapter: 17 QUESTION: 62 Chapter: 17 QUESTION: 73 Chapter: 17 QUESTION: 82 Chapter: 17 QUESTION: 89 Chapter: 19 QUESTION: 19 Chapter: 19 QUESTION: 40 Chapter: 19 QUESTION: 43 Chapter: 19 QUESTION: 54 Chapter: 19 QUESTION: 55 Chapter: 19 QUESTION: 58 Chapter: 19 QUESTION: 60 Chapter: 19 QUESTION: 64 Chapter: 19 QUESTION: 72

14 ANSWER KEY FOR TEST UNTITLED Page a Chapter: 19 QUESTION: 83 (c) 2000 Prentice-Hall, Inc. All rights reserved.

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