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Lec25 - Chemical kinetics Reaction order Molecularity of a...

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Reaction order Molecularity of a reaction First order reactions — unimolecular reactions Second order reactions —bimolecular reactions Chemical kinetics
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First order irreversible reaction The rate is dependent on the concentration of A (reacting molecule and k (rate constant) No reverse reaction
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unimolecular reaction: v (mol/liter.sec) k (sec -1 ) bimolecular reaction k (liter/mol.sec) Velocity is proportional to the concentration of the reactant First Order Reaction
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How do we determine k? If a reaction is first order, the plot of ln[A] vs t would be a straight line; Slope is -k, anthe intercept is ln[A0]
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t 1/2 = the time in which half the substrate is converted Half life is constant for a first order reaction
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Bimolecular reactions k (liter/mol.sec)
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Pseudo first order reactions
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Rates of catalyzed versus non- catalyzed reactions
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Michaelis-Menten Equation • V 0 = rate early in the reaction • V max is the maximal rate • K m is a constant that is characteristic for the enzyme [S] is the substrate concentration
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