# S07 exam 3 - Version 001 Exam 3 David Laude (53015) 1 This...

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Unformatted text preview: Version 001 Exam 3 David Laude (53015) 1 This print-out should have 30 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. V1:1, V2:1, V3:1, V4:1, V5:2. Please make sure you write your version numbers on your scantron. Good luck! Half Rctn Potential 26:09, general, multiple choice, > 1 min, fixed. 001 (part 1 of 1) 6 points The equilibrium constant for the following cell K | K + || Ce 4+ | Ce 3+ | Pt is K = 5 . 518 10 76 . What is E red of the K + /K half-reaction? Assume the reaction is taking place at room temperature ( T = 25 C). Ce 4+ + e- Ce 3+ E red = +1 . 61 V 1.- 2 . 93 V correct 2. +4 . 54 V 3.- 8 . 84 V 4. +2 . 93 V 5.- 4 . 54 V Explanation: Cell Stoic 26:04, general, multiple choice, > 1 min, fixed. 002 (part 1 of 1) 6 points The reaction 2Ag + (aq) + Fe(s) Fe 2+ (aq) + 2Ag(s) taking place in a battery generates a current of 2 Amp. How much Fe(s) is consumed in 1 hour? 1. 2.08 g correct 2. 4.16 g 3. 8.32 g 4. 3 . 46 10- 2 g 5. 1.04 g Explanation: Cell Potential 26:08, general, multiple choice, < 1 min, fixed. 003 (part 1 of 1) 6 points What is the cell potential of the following cell? Pt | Br- (aq , . 2 M) | Br 2 ( ) || Au + (aq , . 7 M) | Au Br 2 + 2 e- 2Br- E red = +1 . 09 V Au + + e- Au E red = +1 . 69 V 1. . 55 V correct 2. . 60 V 3. . 65 V 4. . 48 V 5. . 72 V Explanation: Battery Use 27:03, general, multiple choice, < 1 min, fixed. 004 (part 1 of 1) 6 points Which of the following is not a correct state- ment about a popular battery used in our daily lives? 1. Calcium oxide is the base most commonly found in alkaline batteries. correct 2. Hybrid automobiles most often employ a nickel metal hydride battery as their electri- cal power source. 3. Sulfuric acid is the acid most commonly found in lead acid storage batteries. 4. Nickel cadmium batteries are decreasingly popular because memory effects reduce the lifetime of the battery. 5. Lithium ion batteries, which are used in cell phones, are considered by some to be a safety risk because of explosion or fire. Explanation: Version 001 Exam 3 David Laude (53015) 2 Rctn Rate 02 20:01, general, multiple choice, < 1 min, fixed. 005 (part 1 of 1) 6 points In the reaction 3Mg(s) + 2Fe 2+ (aq) 2Fe(s) + 3Mg 2+ (aq) , [Fe] t = 2 . 4 10- 4 M/s. What is [Mg] t ? 1.- 3 . 6 10- 4 M/s correct 2. +3 . 6 10- 4 M/s 3.- 1 . 6 10- 4 M/s 4. +1 . 6 10- 4 M/s 5. +1 . 2 10- 4 M/s Explanation: Rctn Order 01 20:03, general, multiple choice, < 1 min, fixed....
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## This note was uploaded on 03/25/2009 for the course CH 302 taught by Professor Holcombe during the Spring '07 term at University of Texas at Austin.

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S07 exam 3 - Version 001 Exam 3 David Laude (53015) 1 This...

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