Electrochemistry-problems-7

Electrochemistry-problems-7 - fatykhova(aaf725 –...

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Unformatted text preview: fatykhova (aaf725) – Electrochemistry – richov – (01581) 1 This print-out should have 29 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 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( ℓ ) 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 H only 3. Cr and C only 4. O and H only 002 (part 2 of 4) 10.0 points What is the initial oxidation number for Cr? 1.- 2 2. +3 3. +6 4.- 1 5. 7+ 003 (part 3 of 4) 10.0 points What is the coefficient of Cr 2 O 2 − 7 in its bal- anced reduction half-reaction? 004 (part 4 of 4) 10.0 points What is the coefficient of C 2 H 5 OH in the balanced redox reaction? 005 (part 1 of 2) 10.0 points In the reaction Cl 2 (g) + S 2 O 2 − 3 (aq) → Cl − (aq) + SO 2 − 4 (aq) of the thiosulfate ion with chlorine gas in an acidic solution, identify the oxidizing agent. 1. Cl 2 2. S 2 O 2 − 3 3. Cl − 4. SO 2 − 4 006 (part 2 of 2) 10.0 points Balance the equation using oxidation and re- duction half-reactions. What is the smallest possible integer coefficient of Cl − in the com- bined balanced equation? 007 10.0 points Balance the reaction HI + H 2 SO 4 + KMnO 4 → K 2 SO 4 + MnSO 4 + H 2 O + I 2 . What is the coefficient of HI in the balanced equation? 008 10.0 points Balance the reaction K 2 Cr 2 O 7 + H 2 SO 4 + KI → Cr 2 (SO 4 ) 3 + I 2 + KHSO 4 + H 2 O . What is the coefficient of KI in the balanced equation? 009 10.0 points These two reactions are combined in a redox reaction Cu → Cu 2+ (I) Cr 2 O 2 − 7 → Cr 3+ (II) Choose the correct statement below. Recall that the oxidation state of oxygen is usually- 2....
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This note was uploaded on 10/28/2010 for the course CHAP 12 taught by Professor Lebec during the Spring '10 term at Marlboro.

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Electrochemistry-problems-7 - fatykhova(aaf725 –...

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