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Homework #6 - purdy(sbp456 Homework 6 owers(53885 This...

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purdy (sbp456) – Homework 6 – flowers – (53885) 1 This print-out should have 10 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. This is a short homework assignment due 31Oct2008 at 11PM. 001 (part 1 of 4) 10.0 points The redox reaction H + (aq) + Cr 2 O 2 - 7 (aq) + C 2 H 5 OH(aq) Cr 3+ (aq) + C 2 H 4 O(aq) + H 2 O( ) is used in acidic solution in the Breatha- lyzer test to determine the level of alcohol in the blood. Which elements are undergoing changes in the oxidation state? 1. None of these 2. Cr and C only 3. Cr and H only 4. O and H only 002 (part 2 of 4) 10.0 points What is the final oxidation number for Cr? 1. - 1 2. - 2 3. +3 4. +6 5. 7+ 003 (part 3 of 4) 10.0 points What is the coefficient of Cr 3+ in its balanced reduction half-reaction? 004 (part 4 of 4) 10.0 points What is the coefficient of C 2 H 4 O in the bal- anced redox reaction? 005 10.0 points Balance the reaction HI + H 2 SO 4 + KMnO 4 K 2 SO 4 + MnSO 4 + H 2 O + I 2 .
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