Practice_Quiz_5_Spring_11 - CH301 Spring 2011 TA Practice...

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TA Practice Quiz 5 1. In which of the following polyatomic ions does the chromium atom have an even oxidation state? I. CrO 4 2 - II. CrO 2 - III. CrO 2 2+ 1. I only 2. II only 3. III only 4. I and II 5. I and III 6. II and III 7. I, II and III 2. How many electrons are required to balance the half reaction below? H 2 O 2 + __e 2 OH 1. 1 2. 2 3. 3 4. 4 3. Consider the half reactions below: Br 2 + 2e - 2Br - E° = +1.07 Fe 3+ + 3e - Fe E° = -0.04 Co 3+ + e - Co 2+ E° = +1.80 Zn 2+ + 2e - Zn E° = -0.76 Which species is the weakest oxidizing agent? 1. Zn 2+ 2. Br - 3. Fe 3+ 4. Co 2+ 4. How many moles of metallic Tin (Sn) could be produced from Sn 4+ at a current of 0.2 amperes for 964,853 seconds? 1. 20 moles Sn 2. 2 moles Sn 3. 5 moles Sn 4. 0.5 moles Sn 5. What is the standard cell potential of a battery made from the following two half reactions? Ag + + e - Ag E° = +0.80 Al 3+ + 3e - Al E° = -1.66 1. 2.46 2. -2.46 3. 0.86 4. -0.86 6. Iron can be produced by electrolysis of molten hematite (Fe 2 O 3 ). What species are produced at the cathode and anode respectively? 1. O
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This note was uploaded on 10/07/2011 for the course CHEMISTRY 51635 taught by Professor Laude during the Spring '10 term at University of Texas at Austin.

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Practice_Quiz_5_Spring_11 - CH301 Spring 2011 TA Practice...

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