Lect+29+08 - Objectives for Kinetics Lecture 29 Important...

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Objectives for Kinetics Lecture 29 Important factors for chain reactions The role of temperature in reaction rates A plain language understanding of effects of catalysts on reaction rates Enzyme catalysis - a plain language approach
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Rates of Reaction Remember to include the reciprocal of the stoichiometric coefficients aA + bB cC + dD Rate = -(1/a) d[A]/dt = -(1/b) d[B]/dt = +(1/c)d[C]/dt = +(1/d)d[D]/dt
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Rate laws from mechanism 18.26 1) 2A + B D fast equilibrium K 1 (k 1 / k -1 ) 2) D + B E + F slow k 2 3) F G fast k 3 Intermediates?? D,F Overall reaction? 2A + 2B E + G Rate expression? Rate limiting step is Eqn 2 -1/2 d[A]/dt = d[G]/dt = k 2 [D] [B] eliminate intermediate [D] using pre-equilibrium conditions d[G]/dt = k 2 K 1 [A] 2 [B] 2 Pre-equilibrium value of [D pe ] since k 2 << k 1 & k -1 dD/dt = 0 = k 1 [A] 2 [B]- k -1 [D] since (no k 2 term!!)
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Enzyme Catalysis Enzymes have one or more active catalytic sites often associated with metal centers Reactants - called substrate in this area Sites are usually energized specifically with
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Lect+29+08 - Objectives for Kinetics Lecture 29 Important...

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