CHEMISTRY 112 Exam 2 Jun. 11, 2012 FORM A

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1 CHEMISTRY 112 Exam 2 Jun. 11, 2012 FORM A 1. What is the ph of a solution prepared by dissolving 0.35 mol of CH 3 NH 3 Cl (methylamine hydrochloride) in 1.00 L of 1.1 M CH 3 NH 2 (methylamine). The K b for methylamine is A B C D E Element M reacts with oxygen to form an oxide with the formula MO. When MO is dissolved in water, the resulting solution is basic. Element 'M' is most likely: A. Na B. Ba C. S D. N E. Al 3. Which of these oxides is most basic? A. K 2 O B. Al 2 O 3 C. CO 2 D. MgO E. P 2 O 5

2 4. Which equation represents a reaction that is decreasing in entropy as the reaction proceeds? A. CaCO 3 (s) CaO(s) + CO 2 (g) B. 2C(s) + O 2 (g) 2CO(g) C. BaF 2 (s) Ba 2+ (aq) + 2F (aq) D. N 2 O (g) + NO 2 (g) 3NO(g) E. 2H 2 (g) + O 2 (g) 2H 2 O ( ) 5. For a given reaction, ΔH = kj/mol and ΔS = J/K-mol. Assuming that ΔH and ΔS do not vary with temperature, the reaction is spontaneous. A. at T < 425 K B. at T > 425 K C. at all temperatures D. at T > 298 K E. at T < 298 K 6. Which molecule below should have the highest gas-phase absolute entropy at 25 C? A. N 2 B. CO 2 C. CO D. CH 4 E. CH 3 CH 3 7. The solubility of manganese (II) hydroxide (Mn(OH) 2 ) is M. What is the K sp of Mn(OH) 2? A B C D E

3 8. Complete and balance the following half reaction in acid. CrO 2 (aq) CrO 4 2 (aq) How many electrons are needed and is the reaction an oxidation or reduction? A. 2, oxidation B. 2, reduction C. 3, oxidation D. 4, reduction E. 6, oxidation 9. What is the half-reaction occurring at the anode in the balanced reaction shown below? 3MnO 4 (aq) + 24H + (aq) + 5Fe(s) 3Mn 2+ (aq) + 5Fe 3+ (aq) + 12H 2 O( ) A. Mn O 4 (aq) + 8H + (aq) + 5e Mn 2+ (aq) + 4H 2 O( ) B. 2MnO 4 (aq) + 12H + (aq) + 6e 2Mn 2+ (aq) + 3 H 2 O( ) C. Fe(s) Fe 3+ (aq) + 3e D. Fe(s) Fe 2+ (aq) + 2e E. Fe 2+ (aq) Fe 3+ (aq) + e 10. What is the value of ΔG for this reaction at 25 C. A. +22 kj/mol B. 4.2 kj/mol C. 25 kj/mol D. 50 kj/mol E. 490 kj/mol N 2 (g) + 3H 2 (g) 2NH 3 (g) K eq =

4 11. The drawing below represents a buffer composed of equal concentrations of a weak acid HX and its conjugate base X. Which drawing depicts schematically the composition of the solution after the buffer is diluted by adding pure water? A. 1 B. 2 C. 3 D. 1 and 2 E. 1 and When the following oxidation/reduction reaction is balanced in acid solution, what is the coefficient of H 2 O ( )? A. 7 B. 5 C. 0 D. 3 E. 4 NO 2 (aq) + Cr 2 O 7 2 (aq) Cr 3+ (aq) + NO 3 (aq) Go on to the next page

5 13. Consider the following solutions: ml of 0.2 M CH 3 COOH ml 0.4 M NaOH ml of 0.1 M CH 3 COOH ml 0.1 M NaOH ml of 0.2 M CH 3 COOH ml 0.1 M NaOH ml of 0.3 M HCl ml 0.2 M NaOH The solutions which will be buffers are, A. 1, 2, and 3 B. 4 only C. 3 only D. 1 only E. 2 only ml of 0.274M KOH(aq) is added to 22.5 ml of 0.413M HNO 3 (aq) and a reaction occurs. What is the ph of the final mixture? A B C. 7.0 D E Which of the following is not likely to increase the molar solubility of silver carbonate (Ag 2 CO 3 ) in water? A. (i) only B. (ii) only C. (iii) only (i) Adding NH 3 (ii) D. (i) and (iii) E. (ii) and (iii) Adding HCl (iii) Adding Na 2 CO 3 Go on to the next page

6 16. Calculate the molar solubility at 25 C of silver chromate, Ag 2 CrO 4, in a solution that contains M AgNO 3. The K sp for Ag 2 CrO 4 is at 25 C. A M B M C M D M E M 17. Consider the following table of thermodynamic data. All values are tabulated for 25 C. Substance ΔG f (kj/mol) S (J/mol - K) C 2 H 2 (g) C 2 H 4 (g) C 2 H 6 (g) H 2 (g) H 2 O (g) C 2 H 5 OH ( ) What is the value of ΔH for the reaction described below? Assume the reaction is performed at 25 C. A. 173 kj B. 236 kj C. 311 kj D. 248 kj C 2 H 2 (g) + 2H 2 (g) C 2 H 6 (g) E. There is insufficient information to determine this. Go on to the next page

7 18. What is ΔG for the reaction, Pb(s) + 2Ag + (aq) Pb 2+ (aq) + 2Ag(s)? A kj B. 334 kj C. 179 kj D. 129 kj E. 167 kj 19. A beaker contains 50 ml of 0.15M NH 3 (aq). It is titrated with 0.15M HNO 3 (aq) at 25 C. K b for NH 3 = What is the ph at the equivalence point of this titration? A B C D E Calculate the concentration of Cu 2+ (aq) in 1L of a solution that contains a total of mol of Cu(II) ion and that is 0.10 M in NH 3. ( K f for [Cu(NH 3 ) 4 2+ ] = 5 x ) A M B M C M D M E M Go on to the next page

8 ml of M Na 2 SO 4 is added to ml of M AgNO 3 at 25 C. The K sp for Ag 2 SO 4 is at 25 C, and NaNO 3 is very soluble in water at 25 C. Which one of the following statements is true? A. Ag 2 SO 4 will precipitate and extra Ag + (aq), but no SO 4 2 (aq), will be present after precipitation. B. Ag 2 SO 4 will precipitate and extra SO 4 2 (aq), but no Ag + (aq), will be present after precipitation. C. Ag 2 SO 4 will precipitate and extra SO 4 2 (aq) and Ag + (aq) will be present after precipitation. D. Ag 2 SO 4 will precipitate, but there will be no extra SO 4 2 (aq) or Ag + (aq) present after precipitation. E. Ag 2 SO 4 will not precipitate from solution under these conditions. 22. What is the equilibrium constant for the neutralization reaction of HClO with a KOH solution at 25 C? (K a for HClO is ) HClO(aq) + KOH(aq) KClO(aq) + H 2 O(l) A B C D E Go on to the last page

9 23. Calculate E for a cell in which the overall reaction is: A V B V C V D V E V O 2 (g) + H 2 (g) H 2 O 2 (aq) 24. What is the value of E cell for the reaction below, when the concentration of Zn 2+ (aq) is M and the concentration of Pb 2+ (aq) is 1.0 M? Pb 2+ (aq) + Zn(s) Zn 2+ (aq) + Pb(s) A V B V C V D V E V 25. Arrange the following agents in order of increasing oxidizing power (weakest oxidizing agent to strongest oxidizing agent): H + Fe 2+ H 2 O 2 Cr 3+ Sn A. H + < Fe 2+ < H 2 O 2 < Cr 3+ < Sn B. Sn < H 2 O 2 < H + < Fe 2+ < Cr 3+ C. Cr 3+ < Sn < H 2 O 2 < Fe 2+ < H + D. Cr 3+ < Fe 2+ < H + < H 2 O 2 < Sn E. Sn < Cr 3+ < Fe 2+ < H + < H 2 O 2 END OF EXAM

10 Chem 112 Summer 2012 Exam 2 Answer Key 6/11/12 Form A 1. E 2. B 3. A 4. E 5. B 6. E 7. E 8. C 9. C 10. D 11. B 12. E 13. C 14. E 15. C 16. E 17. C 18. C 19. B 20. D 21. E 22. C 23. C 24. D 25. E

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