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Unformatted text preview: Elbel, Brittany Homework 10 Due: Apr 10 2006, noon Inst: J A Holcombe 1 This print-out should have 12 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 Consider the reaction CuSO 4 (aq) + Zn(s) Cu(s) + ZnSO 4 (aq) In the ion-electron method, what is the oxidation half-reaction? 1. Zn Zn + + e- 2. Zn Zn +2 + 2 e- correct 3. Cu +2 + 2 e- Cu 4. Cu +2 Cu Explanation: The oxidation number of Zn changes from 0 to +2, so Zn is oxidized. We set up the oxidation half-reaction, leaving out spectator ions: Zn Zn 2+ The atoms in the half-reaction are bal- anced. We balance the total charge by adding electrons: Zn Zn 2+ + 2 e- 002 (part 1 of 2) 10 points Using oxidation and reduction half-reactions, balance the skeletal equation Cl 2 O 7 (g) + H 2 O 2 (aq) ClO- 2 (aq) + O 2 (g) of the production of chlorite ions from dichlo- rine heptoxide. The reaction takes place in a basic solution. What is the smallest possible integer co- efficient of H 2 O 2 in the combined balanced equation? Correct answer: 4 ....
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This note was uploaded on 06/23/2008 for the course CH 302 taught by Professor Holcombe during the Spring '07 term at University of Texas at Austin.
- Spring '07