Old Exam 3 - CHM 2046 Exam 3 Gower Sections (Form Code A)...

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CHM 2046 Exam 3 Gower Sections (Form Code A) Fall 2009 Instructions: On your scantron sheet enter and bubble in your name , UF ID number (start on the leftmost space and leave any extra spaces blank), and Form Code (see above). You may retain your exam sheet (mark your answers on it and the scantron sheet) and any other sheets. Turn in only your scantron. Check your bubbling carefully – bubbling errors will not be negotiated . Note : the double-arrow symbol used in this exam ( ↔) refers to a reversible reaction Potentially useful info: 1 F = 96,500 C/mol e 1A = 1C/s R = 0.0821 lit•atm/mol•K 1. Which of the following statements about galvanic/voltaic cells is not correct? (1) the anode is the electrode at which oxidation occurs (2) electrons are conducted from the anode to the cathode (3) "active" anodes are consumed (lose mass) over time (4) a "salt bridge" conducts electrons from the anode half-cell to the cathode half-cell (5) any free energy released (when Δ G < 0) can be used to generate electrical energy 2. What is the standard cell potential E ° at 25°C of a galvanic/voltaic cell made up of Al/Al 3+ and Cr/Cr 3+ half-cells? (1) – 0.92 V (2) + 0.92 V (3) – 2.4 V (4) + 2.4 V (5) + 2.0 V 3. Which of the following cell diagrams does not represent a spontaneous galvanic/voltaic cell? (1) Cr(s) | Cr 3+ (aq) || Ag + (aq) | Ag(s) (2) Zn(s) | Zn 2+ (aq) || Cu 2+ (aq) | Cu(s) (3) Ni(s) | Ni 2+ (aq) || Cd 2+ (aq) | Cd(s) (4) Fe(s) | Fe 2+ (aq) || Co 2+ (aq) | Co(s) (5) Al(s) | Al 3+ (aq) || Cu 2+ (aq) | Cu(s) 4. If a chlor-alkali cell used a current of 3 x 10 4 A, about how many kg of Cl 2 gas would be produced in a typical 8-hour operating day? (chlor-alkali anode half-reaction: 2Cl (aq) Cl 2 (g) + 2 e ) (1) 1000 kg (2) 800 kg (3) 600 kg (4) 300 kg (5) 100 kg 5. Which of the following statements about the electrochemical process involved in rust formation on iron objects is not correct? (1) the iron object acts as both the active anode and the cathode in the rusting process (2) the loss of iron and the depositing of rust often occur at different places on the same object (3) iron rusts more quickly in contact with ionic solutions
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This note was uploaded on 01/25/2011 for the course CHM 2046 taught by Professor Veige/martin during the Fall '07 term at University of Florida.

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Old Exam 3 - CHM 2046 Exam 3 Gower Sections (Form Code A)...

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