CHM 2046 Final Exam Review: Chapters 11 18

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1 Chapter Which of the following has the lowest boiling point? a. NH 3 b. CH 3 Cl c. NaCl d. CO 2 e. CH 3 CH 2 CH 2 CH 2 CH 3 2. Which of the following has the lowest vapor pressure? a. CH 3 F b. CH 3 OH c. CH 3 OCH 3 d. CH 3 CH 2 CH 3 e. CH 3 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 3 Below is a phase diagram for carbon dioxide. Use it to answer question If CO 2 at 100 and 20 atm atm is heated to 40 at constant pressure, what phase change will occur? a. Fusion b. Sublimation c. Condensation d. Vaporization

2 e. No phase change will occur. 4. Acetone (C 3 H 6 O) has a melting point of 94.8 and a normal boiling point of How much energy is required to heat 29.0 g of acetone from 0.0 to 60.0? C solid =96.0 J/mol*K C liquid = J/mol*K C vapor =75.0 J/mol*K ΔH vap = 29.1 kj/mol ΔH fus = 5.69 kj/mol a. 227 kj b. 227,000 kj c. 272 kj d. 272,000 kj e. 207 kj Chapter Which molecule will be the least soluble in water? a. CCl 4 b. CH 2 Cl 2 c. OHCH 2 CH 2 OH d. CO 2 e. None of the above 6. Silver nitrate has a lattice energy of 820 kj/mol and a heat of solution of kj/mol. What is the heat of hydration for silver nitrate? Is the hydration of silver nitrate endothermic or exothermic? a kj/mol; exothermic b kj/mol; exothermic c kj/mol; endothermic d kj/mol; exothermic e kj/mol; endothermic 7. When dissolved in water, which of the following would produce the highest vapor pressure? a. CaCO 3

3 b. K 2 SO 4 c. Al 2 SO 3 d. C 6 H 12 O 6 e. CO 2 8. What is the boiling point of an aqueous solution that is 10.0% Na 2 CO 3 by mass? K b of water = /m a b c d e An aqueous solution is 8.6 % NaCl by mass. What is the molar concentration of this solution? a M b M c M d M e M Chapter Consider the following reaction and the data below: 2 NO 2 ( g ) + F 2 ( g ) 2 NO 2 F ( g ) [NO 2 ] (M) [F 2 ] (M) Initial Rate (M/s)

4 What is the order of the reaction in terms of NO 2? a. zero order b. ¾ order c. ½ order d. first order e. second order 11. For the decomposition of SO 2 Cl 2, a plot of ln [SO 2 Cl 2 ] versus time yields a straight line with slope 1.42 x 10 4 s 1 at a certain temperature. If the initial concentration of SO 2 Cl 2 is M, what is the concentration of SO 2 Cl 2 after 2 minutes? (Assume constant temperature) a x 10 2 M b x 10 3 M c x 10 1 M d x 10 2 M e x 10 3 M 12. Consider the following mechanism: AB + B AB 2 k 1 AB 2 + C AB + BC Slow Fast k 2 What is the rate law for the reaction that is represented by the mechanism above? a. rate = k 1 [AB] [B] [AB 2 ] b. rate = k 1 k 2 [AB] [C] [AB 2 ] [C] c. rate = k 2 [AB 2 ] [C] d. rate = k 2 [AB 2 ] [C] [AB] [BC] e. rate = k 1 [AB] [B] 13. Consider the following three step mechanism. k 1 2NO ( g ) N 2 O 2 ( g ) Fast k 1 k 2

5 H 2 ( g ) + N 2 O 2 ( g ) H 2 O ( g ) + N 2 O ( g ) Slow k 3 N 2 O ( g ) + H 2 ( g ) N 2 ( g ) + H 2 O ( g ) Fast Chapter 14 What is the predicted rate law of the mechanism above? a. rate = k 2 [H 2 ] [N 2 O 2 ] b. rate = k 2 [H 2 ] + [N 2 O 2 ] c. rate = k [H 2 ] [NO] 2 d. rate = k 1 [N 2 O 2 ] e. rate = k 1 [NO] 2 *Use the following chemical reaction to answer questions * C (s) + CO 2 (g) 2 CO (g) Kp = 1.2 x 10 3 ΔH = kj/mol 14. If the reaction is at equilibrium and the volume of the container increases by 0.05 L, which of the following will occur? a. the reaction will shift left b. the reaction will shift right c. the reaction will not shift; it s at equilibrium d. none of the above 15. If a reaction vessel contains a partial pressure of CO 2 at 2.5 atm and a partial pressure of CO at 0.5 atm, which of the following will occur? a. the reaction will shift left b. the reaction will shift right c. the reaction will not shift; it s at equilibrium d. none of the above 16. What is the molar solubility of barium fluoride in pure water? K sp of barium fluoride = 1.7 x 10 6

6 a x 10 2 M b x 10 3 M c x 10 2 M d x 10 4 M e x 10 3 M 17. What is the molar solubility of Mg(OH) 2 in a solution with a ph = 10? K sp of Mg(OH) 2 = 2.06 x a x 10 6 M b x 10 5 M c x 10 6 M d x 10 6 M e x 10 5 M Chapter Which of the following will form the strongest conjugate base? a. HBr b. HBrO c. HBrO 2 d. HBrO 3 e. HBrO What is the poh of a M solution of strontium hydroxide? a b c d What is the ph of a M solution of NH 4 Cl? K b of NH 3 = 1.8 x 10 5 a. 8.6 b. 8.4 c. 5.6 d. 5.3

7 Chapter 16 e. 7.5 Use the following information for questions A ml sample of M CH 3 NH 2 is titrated with M HBr. K b of CH 3 NH 2 = 4.4 x What is the [OH ] after 15.0 ml of the acid is added? a x 10 4 M b x 10 2 M c x 10 3 M d x 10 3 M e x 10 2 M 22. What is the ph at the equivalence point? a b c d e What is the [H 3 O + ] concentration after ml of the acid is added? a. 1.2 x 10 4 M b. 1.4 x 10 3 M c. 1.4 x 10 2 M d. 1.3 x 10 3 M e. 1.3 x 10 4 M 24. How much NH 4 Cl (s) is needed, in grams, to create a buffer solution with a ph = 9.00 using 100 ml of M NH 3 solution? (Assume the volume from NH 4 Cl is negligible) K b of NH 3 = 1.8 x 10 5

8 Chapter 17 a g b g c g d g e g 25. Which of the following is true concerning a nonspontaneous reaction? a. It s impossible for the reaction to occur b. The reaction occurs, but very slowly c. It can be made spontaneous by adding a catalyst d. It can be made spontaneous by coupling it to a spontaneous reaction e. A and D 26. Which of the following will be nonspontaneous at all temperatures? a. ΔS rxn = 352 J/K; ΔH rxn = +125 kj b. ΔS rxn = +253 J/K; ΔH rxn = 215 kj c. ΔH rxn = +215 kj; ΔS rxn = +352 J/K d. ΔH rxn = 125 kj; ΔS rxn = 253 J/K e. Not enough information 27. At 0, a reaction has a ΔH rxn = 612 kj and ΔS rxn = 215 J/K.What is the value for the change in Gibb s free energy? Is the reaction spontaneous or nonspontaneous? a. +58,100 kj; nonspontaneous b. +58,100 kj; spontaneous c. 58,100 kj; spontaneous d. 553 kj; spontaneous e. 553 kj; nonspontaneous Chapter 18

9 28. The following is the balanced reaction for the voltaic cell above. Cr (s) + Fe 3+ (aq) Cr 3+ (aq) + Fe (s) Which of the following is true about the voltaic cell? a. Cr (s) is reduced to Cr 3+ (aq) b. Cations in the salt bridge move toward the Cd 2+ (aq) solution c. Fe is the negative electrode d. In the wire, electrons flow from Iron to Chromium e. None of the above 29. The following is the balanced reaction powered by the electrolytic cell above.

10 Ni (s) + Cd 2+ (aq) Ni 2+ (aq) + Cd (s) Which of the following is false about the electrolytic cell? a. Nickel is the positive electrode b. Cd is reduced to Cd 2+ c. In the wire, electrons flow from Nickel to Cadmium d. Cations in the salt bridge move toward the Ni 2+ (aq) solution e. All of the above 30. A concentration cell consists of one half cell with [Sn 2+ ] = M and a Sn (s) electrode and another half cell with [Sn 2+ ] = M and a Sn (s) electrode. Which of the following is the correct notation for the cell. a. Sn (s) Sn 2+ (aq,.500 M) Sn 2+ (aq, M) Sn (s) b. Sn (s) Sn 2+ (aq,.0200 M) Sn 2+ (aq, M) Sn (s) c. Sn (s) Sn 2+ (aq,.0200 M) Sn 2+ (aq, M) Sn (s) d. Sn 2+ (aq,.500 M) Sn (s) Sn (s) Sn 2+ (aq, M) e. Sn 2+ (aq,.0200 M) Sn (s) Sn (s) Sn 2+ (aq, M) Answer Key: Chapter 11: 1. D 2. B 3. A 4. A Chapter 12: 5. D 6. B 7. E 8. A 9. E Chapter 13: 10. D 11. A 12. E 13. C Chapter 14: 14. B 15. A 16. E 17. B Chapter 15: 18. B 19. A 20. C Chapter 16: 21. E 22. C 23. C 24. C Chapter 17: 25. D 26. D 27. D Chapter 18: 28. E 29. D 30. B

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