# HW 10 - Wright, Jacqueline Homework 10 Due: Nov 21 2007,...

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Unformatted text preview: Wright, Jacqueline Homework 10 Due: Nov 21 2007, 11:00 pm Inst: James Holcombe 1 This print-out should have 21 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. The due time is Central time. 001 (part 1 of 1) 10 points Calculate the potential for the cell indicated: Fe | Fe 2+ (10- 3 M) || Pb 2+ (10- 5 M) | Pb Pb 2+ + 2 e- Pb E =- . 126 V Fe 2+ + 2 e- Fe E =- . 440 V 1. 0.255 V 2. 0.284 V 3. 0.196 V 4. 0.373 V 5. 0.432 V 002 (part 1 of 1) 10 points An evil scientist has created a lightening weapon to destroy the entire world unless they give him a herring (a fish) and a very nice shrubbery. As a power source, he has created a fuel cell that he thinks will run on protons (H + ) and fluorine molecules (F 2 ). (He cre- ates them and holds them in special magnetic bottles made of superconductive material.) Given the standard reduction potentials 2H + + 2 e- H 2 E = 0.00 2F 2 + 2 e- F- E = 2.87 will his power source work? 1. Ni! Ni! Ni! 2. Choose me! Choose me! 3. Nope. Hes a defective evil genius. There is no H 2 to be oxidized. 4. M R ducks! M R not! M R 2! 5. Yes. The E cell is positive so he will have plenty of power to run his weapon. 003 (part 1 of 1) 10 points You turn on a flashlight containing brand new NiCad batteries and keep it lit for a minute or two. Which of the following can be considered TRUE regarding the chemical state of these batteries? I. G for the battery reaction is negative. II. E cell > 0. III. The batteries are at equilibrium....
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## This note was uploaded on 12/08/2008 for the course CH 302 taught by Professor Holcombe during the Spring '07 term at University of Texas at Austin.

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HW 10 - Wright, Jacqueline Homework 10 Due: Nov 21 2007,...

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