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Homework 10

Homework 10 - Gadhia Tejas Homework 10 Due 11:00 pm Inst...

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Gadhia, Tejas – 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 0 = - 0 . 126 V Fe 2+ + 2 e - Fe E 0 = - 0 . 440 V 1. 0.432 V 2. 0.255 V 3. 0.284 V 4. 0.373 V 5. 0.196 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 2 H + + 2 e - H 2 E = 0.00 2 F 2 + 2 e - F - E = 2.87 will his power source work? 1. Choose me! Choose me! 2. Nope. He’s a defective evil genius. There is no H 2 to be oxidized. 3. M R ducks! M R not! M R 2! 4. Ni! Ni! Ni! 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. Δ G for the battery reaction is negative. II. E cell > 0. III. The batteries are at equilibrium.

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