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Unformatted text preview: Chem 1B Name Lab M T(AM) T(PM) Exam 4 December 1, 2010 Instructions: For all mathematical problems, show your work. Give the basic formula (if there is one), rearrange it if necessary, plug in data with units, round properly to the correct number of significant figures, and place a box around the answer. For essay questions, be complete, but concise. Complete sentences with proper spelling and punctuation are expected. Useful information: R = 0.0083145 kJ mol . K ; 1 F = 96,485 C mol e- = 96,485 J V . mol e- ; 0.0592 V c = 2.9979 × 10 8 m/s, 1 amu = 1.660540 × 10-27 kg 1. (2 pts.) Which of the following is TRUE for an operating voltaic cell? (a) G > 0 ; E = 0 (b) G < 0 ; E < 0 (c) G = 0 ; E > 0 (d) G = 0 ; E = 0 (e) G < 0 ; E > 0 2. (2 pts.) The voltaic cell made up of cobalt and silver has E° cell = 1.08 V. If the standard reduction potential for the silver half-reaction is 0.80 V, what is the standard reduction potential for the cobalt reaction? Co(s) + 2Ag 1+ (aq) → Co 2+ (aq) + 2Ag(s) (a) 0.28 V (b) -0.28 V (c) 1.88 V (d) -1.88 V (e) -0.14 V 3. (2 pts.) Which statement is true. (a) Oxidation occurs at the cathode of a voltaic cell. (b) A primary battery is one that can be recharged. (c) Electrolytic cells utilize electrical energy to drive nonspontaneous redox reactions. (d) A salt bridge provides a path for electrons to move between compartments of a voltaic cell. (e) All statements are true. 4. (2 pts.) Nuclides that have neutron-to-proton ratios that are too low (compared with stable nuclides) are expected to undergo: (a) alpha decay. (b) beta decay. (c) positron decay. (d) electron capture. (e) positron decay or electron capture. 5. (2 pts.) Which of the following characteristics of particles produced by radioactive decay are important for assessing the potential for biological damage to living systems? (a) mass (b) charge (c) penetrating ability (d) kinetic energy (e) All of these....
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This note was uploaded on 12/21/2010 for the course CHEM 1B taught by Professor Garyj.decicco during the Fall '10 term at Santa Rosa.
- Fall '10