Exam 3 Version A Key

Exam 3 Version A Key - Chemistry 1515, Midterm Exam #3,...

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Chemistry 1515, Midterm Exam #3, Version A April 6, 2011 This exam is closed book, notes, papers, etc. You may use a calculator. If you need a physical constant or unit conversion factor that is not provided, please ask. This exam must represent your own work. Put your answers on an orange scantron form. Useful Information R = 8.314 J/mol K = 0.0821 L atm/mol K N A = 6.022 x 10 23 mol -1 F = 9.6485 x 10 4 J V -1 (mol e - ) -1 1 atm = 760 Torr
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CHEM 1515, Spring 2011 Midterm Exam #3, Version A Page 2 1. Which exam version do you have? 2. The line notation, Pt | H 2 ( g ) | H + ( aq ) || Cu 2+ ( aq ) | Cu( s ), indicates that A. copper metal is a product of the cell reaction. B. hydrogen gas (H 2 ) is a product of the cell reaction. C. Cu is the anode. D. Pt is the cathode. E. Cu 2+ is the reducing agent. 3. Nitric oxide reacts with chlorine to form NOCl. The data refer to 298 K. 2NO( g ) + Cl 2 ( g ) 2NOCl( g ) What is the value of Δ G ° for this reaction at 550 K? A. -143.76 kJ B. -78.78 kJ C. -22.24 kJ D. -10.56 kJ E. 66600 kJ 4. Consider the following redox equation Mn(OH) 2 ( s ) + MnO 4 ¯( aq ) MnO 4 2 ¯( aq ) (basic solution) When the equation is balanced with smallest whole number coefficients, what is the coefficient for OH¯( aq ) and on which side of the equation is OH¯( aq ) present? A. 4, reactant side B. 4, product side C. 6, reactant side D. 6, product side E. None of these choices is correct. 5. A 20.0-mL sample of 0.50 M H 2 C 6 H 6 O 6 (ascorbic acid, a diprotic acid) was titrated with 0.50 M NaOH. The following data were gathered during the titration. What is K a2 for ascorbic acid? A. 6.8 × 10¯ 5 B. 6.2 × 10¯ 6 C. 6.2 × 10¯ 7 D. 6.2 × 10¯ 8 E. 2.8 × 10¯ 12
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CHEM 1515, Spring 2011 Midterm Exam #3, Version A Page 3 6. Which one of the following is the best representation of the titration curve which will be obtained in the titration of a weak base (0.10 mol L¯ 1 ) with HCl of the same concentration? A. B. C. D. E.
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CHEM 1515, Spring 2011 Midterm Exam #3, Version A Page 4 7. A reaction is proceeding towards equilibrium. At a certain stage, the concentrations of reactants and products are such that Δ G = Δ G ° . What conclusion can reasonably be drawn about the reaction at this time? A.
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This note was uploaded on 01/08/2012 for the course CHEM 1515 taught by Professor White during the Fall '11 term at Oklahoma State.

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Exam 3 Version A Key - Chemistry 1515, Midterm Exam #3,...

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