EXAM_3_solution_Form_A

EXAM_3_solution_Form_A - CHEM 2046 Fall 2011 Exam 3 Prof....

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CHEM 2046 Fall 2011 Exam 3 Prof. Col. Charles R. Martin Form A Instructions : Mark only one answer per question on the scantron. You have 1 h 55 min to complete the test. Make sure you have entered your correct UFID and Form Code in the scantron before submission. 1. Which of the following statements are correct? (I) Homogeneous electron-transfer reactions occur across an interface. (II) In homogeneous electron-transfer reactions the oxidizing and reducing agents are in the same phase. (III) In homogeneous electron-transfer reactions the oxidizing and reducing agents are in separate phases. (IV) Heterogeneous electron-transfer reactions occur across an interface. (V) Heterogeneous electron-transfer reactions always involve solids. (A) (I), (II) and (IV) (B) (III) and (IV) (C) (II) and (IV) (D) (III), (IV) and (V) (E) (I), (II) and (V) 2. Arrange the following species in order of increasing reducing strength: H 2 (g), Ag(s), Na(s), Fe(s). (A) H 2 (g) > Ag(s) > Na(s) > Fe(s) (B) Na(s) > H 2 (g) > Ag(s) > Fe(s) (C) H 2 (g) > Ag(s) > Fe(s) > Na(s) (D) Ag(s) > Fe(s) > Na(s) > H 2 (g) (E) Na(s) > Fe(s) > H 2 (g) > Ag(s) 3. For the reaction 2H 2 (g) + C 2 H 2 (g) → C 2 H 6 (g), Δ G °= –621.19 kJ/mol at 298 K. What is the Δ G at this temperature when p (H 2 ) = p (C 2 H 2 ) = p (C 2 H 6 ) = 100 atm? (A) –598.37 kJ/mol (B) –621.19 kJ/mol (C) –644.01 kJ/mol (D) –609.78 kJ/mol (E) –611.28 kJ/mol Δ G = Δ G ° + RT ln Q 4. Given E ° (Ag + /Ag) = 0.80 V, calculate the potential of a silver wire at 25°C in a solution of 0.05 M AgNO 3 . (A) 0.88 V (B) 0.62 V (C) 0.98 V (D) 0.62 V (E) 0.72 V E = E ° – 0.0592 log (1/[Ag + ]) 5. For the reaction CaCO 3 (s) CaO(s) + CO 2 (g), K p = 2.5×10 –10 at 25°C. What is the Δ G o for this reaction at this particular temperature?
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EXAM_3_solution_Form_A - CHEM 2046 Fall 2011 Exam 3 Prof....

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