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probset6withanswers

probset6withanswers - Chem33-1 C-hour Problem Set 6 Student...

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Chem33-1, C-hour Problem Set 6 Due Date: Nov. 19, 2007 Student name: ___________________ Student SISD #: __________________ 1. The following elementary reaction is very useful in organic chemistry: + + Cl OH CH OH Cl CH 3 3 This reaction is first order in CH 3 Cl and first order in OH - . What is the rate law? ANSWER: Generally, n m B A k rate ] [ ] [ = Since this reaction is first order in both CH 3 Cl and OH - , 1 = = n m . Therefore, ] [ ] [ 3 = OH Cl CH k rate 2. Balance the following oxidation-reduction reactions, which occur in basic solution, using the half-reaction method. Al(s) + MnO 4 - (aq) MnO 2 (s) + Al(OH) 4 - (aq) ANSWER: Use the same method as with acidic solutions. After the final balanced equation, then convert H + to OH - as described in section 4.11 of the text. The extra step involves converting H + into H 2 O by adding equal moles of OH - to each side of the reaction. This converts the reaction to a basic solution while keeping it balanced. Al Al(OH) 4 - MnO 4 - MnO 2 4H 2 O + Al Al(OH) 4 - + 4 H + 3 e - + 4 H + + MNO 4 - MnO 2 + 2 H 2 O 4H 2 O + Al Al(OH) 4 - + 4 H + + 3 e - 4 H 2 O + Al Al(OH) 4 - + 4 H + + 3 e - 3 e - + 4 H + + MNO 4 - MnO 2 + 2 H 2 O 2H 2 O(l) + Al(s) + MnO 4 - (aq) Al(OH) 4 - (aq) + MnO 2 (s) Since H + doesn’t appear in the final balanced reaction, we are done.
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