Lecture+6+-+Chemical+Kinetics

Lecture+6+-+Chemical+Kinetics - Problem Set #1: returned at...

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Problem Set #1: returned at end of class today. Practice Midterm: see course website. Review Session: Tue Aug 16 th at 7pm in 179 Chem. Midterm: Chapters 2.6-2.9, 9 and 10; Wed Aug 17 th
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Comparing Reaction Rate Theories RT H R S B e e h T k k o o Δ Δ = RT E A Ae k = Arrhenius Theory: Collision Theory: Transition State Theory: Ca 2+ (aq) + SO 4 2- (aq) [Ca 2+ ---SO 4 2- ] CaSO 4 (s) Δ S tot = Δ S reactants + Δ S solvent Δ S solvent is positive because H 2 O less ordered around the neutral transition state. Δ S reactants is negative because reactants more disordered than transition state. If | Δ S solvent | > | Δ S reactants |, then Δ S tot > 0, usually indicates a fast reaction rate. μ π T k d B A Z B AB 8 ] ][ [ 2 11 = RT E A e B A Z P k = ] ][ [ 11 = 10 11 M -1 s -1 A + B Product k
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AB k 1 k -1 Temperature Jump and Relaxation Kinetics {} 1 1 1 + = k k τ 1 1 = k k K eq 2 0 ln RT H T K eq Δ = Example: What is k 1 and k -1 if τ =10 μ s and K eq =1? 1 1 1 = = k k K eq 1/T lnK R H Δ + = eq K k 1 1 1 1 + = eq K k 1 1 1 1 1 4 5 1 10 5 1 1 10 1 × = + = s k 1 4 1 4 1 1 10 5 1 10 5 × = × = = s s K k k eq Δ [B] 0 /e t e B t B Δ = Δ 0 ] [ ) ]( [ + heat
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r eq eq f k OH H k + + = + ) ] [ ] ([ 1 τ Determine k f and k r by measuring relaxation time and equilibrium constant after temperature jump: H + + OH - H 2 O k f k r 2 0 ln RT H T K EQ Δ = r f eq k k K = + + = + eq eq eq f K OH H k 1 ] [ ] [ 1 Second Order Relaxation Time t e x t x = 0 ) (
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Enzymes and Catalysis (Chapter 10) General principles of enzyme catalysis: Catalysts lower the Gibbs free energy of transition state (G ) and increase both the forward and reverse reaction rates (k exp(- Δ G /RT). Catalysts do NOT change the equilibrium constant ( Δ G°) but rather increase the rate of establishing equilibrium (K eq = k 1 /k -1 ).
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This note was uploaded on 08/13/2011 for the course CHE 107B taught by Professor Ames during the Spring '11 term at UC Davis.

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Lecture+6+-+Chemical+Kinetics - Problem Set #1: returned at...

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