Chem_208_Lecture_10_Color - Chem 208 Review Sessions: Sat....

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Chem 208 Review Sessions: Sat. and Sun. 2:00 - 4:00 PM Baker 200 PS4 due Friday at 2PM NO graphing/text capable calculators on 208 exams Prelim 1: Tues Feb 26, 7:30- 9:00PM Ch 7, 14 (PS 1- 4) Today: Finish Ch. 14, Starting Ch. 15
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Reaction Mechanism Notes : Exponents in rate law are the stoichiometric coefficients. Elementary processes are reversible, may reach eq’m with equal rates of forward and reverse reactions. Reaction intermediates may be formed and consumed in elementary steps. They cannot appear in the overall chemical equation or in the overall rate law expression. The “rate determining step” occurs much more slowly than the others. Common Mechanisms : 1. Slow step followed by a fast step. 2. Fast reversible step followed by a slow step. 3. If not clear which step is slow, apply steady state approx . NO 2 (g) + CO (g) NO (g) + CO 2 (g) 2NO (g) + O 2 (g) 2NO 2 (g) 2NO (g) + O 2 (g) 2NO 2 (g)
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Catalyst • provides an alternative reaction pathway of lower activation
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Chem_208_Lecture_10_Color - Chem 208 Review Sessions: Sat....

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