Exam 3, Spring 2011 - Version 459 Exam 3 laude (51635) 1...

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Unformatted text preview: Version 459 Exam 3 laude (51635) 1 This print-out should have 40 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 6.0 points What is ratio of [Co 2+ ] /[Ni 2+ ] when a bat- tery built from the two half reactions below reaches equilibrium? Half reaction E Ni 2+- Fe- . 25 Co 2+- Co- . 28 1. 3.20 2. 0.10 3. 0.31 4. 10.23 correct Explanation: E = +0 . 04 E cell = E cell- . 05916 N e log Q 0 = 0 . 03- . 05916 2 log [Co 2+ ] [Ni 2+ ] log [Co 2+ ] [Ni 2+ ] = 1 . 01 [Co 2+ ] [Ni 2+ ] = 10 1 . 01 = 10 . 23 002 6.0 points Which of the following gemstones was used for fireproofing until it was discovered to be a potent carcinogen? 1. diamond 2. talc 3. quartz 4. asbestos correct Explanation: Asbestos has useful flame retardant proper- ties and also is an inhalation risk as prolonged exposure can lead to mesothilioma. 003 6.0 points How many total structural isomers would the hydrocarbons of formula C 3 H 8 through C 6 H 14 have? 1. 13 isomers 2. 11 isomers correct 3. 14 isomers 4. 12 isomer 5. 10 isomers Explanation: The formula C 3 H 8 would correspond only to n-propane (1 isomer). The formula C 4 H 10 would correspond to n-butane and methylpropane (2 isomers). The formula C 5 H 12 would describe n-pentane, methylbu- tane and tetramethyl-methane (3 isomers). The formula C 6 H 14 would describe n- hexane, 2-methylpentane, 3-methylpentane, ethylbutane, 2,2-dimethylbutane and 2,3- dimethylbutane (5 isomers). 004 6.0 points What was the electrolyte in the Pons/Fleishmann cell used to reportedly gen- erate an excess of energy (cold fusion)? 1. 0.1 M LiOD correct 2. 0.1 M DCl 3. 0.1 M HCl 4. 0.1 M D 2 SO 4 5. 0.1 M Pd(OD) 2 Explanation: 005 6.0 points Version 459 Exam 3 laude (51635) 2 What is the name of the following molecule? H 2 N CH 3 1. 1-amino 2-butene 2. 1-amino 2-butyne correct 3. 1-aminobutane 4. amidobutyne 5. 4-butynamine Explanation: The -amine group has higher priority than the -yne group, and so numbering starts from the amine carbon. The unsaturated carbon- carbon bond begins at carbon 2. 006 6.0 points What is the activation energy for the for- ward reaction in the diagram below? R T P 20 40 60 80 E (kJ mol 1 ) Reaction Coordinate 1. 30 kJ mol 1 2. 45 kJ mol 1 correct 3. 75 kJ mol 1 4. 20 kJ mol 1 5. 25 kJ mol 1 Explanation: The difference in energies between the tran- sition state and the ground state reactants is 45 kJ mol 1 . 007 6.0 points Which of the following is not true of fluorine (F)? 1. It is a powerful oxidizing agent. 2. It tends to form insoluble salts and min- erals. 3. Its anion is abundant in Earths oceans....
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This note was uploaded on 09/17/2011 for the course CH 302 taught by Professor Holcombe during the Spring '07 term at University of Texas at Austin.

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Exam 3, Spring 2011 - Version 459 Exam 3 laude (51635) 1...

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