110223 - Chemical kinetics (Chapter 9 311-324) Reaction...

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1 CHM3400 - Lecture 20 Feb 23 Chemical kinetics (Chapter 9 311-324) Reaction rates and rate constants (watch units!) Zero-, first- and second- order reactions Half-life
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2 Reaction rates R P t R t t R R Δ Δ = ] [ ] [ ] [ 1 2 1 2 Rate of the reaction: For a simple unimolecular reaction: By convention, to make the reaction rate have a positive value: t R rate Δ Δ = ] [ In terms of the product: t P t t P P Δ Δ = ] [ ] [ ] [ 1 2 1 2 Mathematically: dt P d dt R d rate ] [ ] [ = = For incremental changes of the rate
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3 Reaction rates 2R P For the reaction: dt P d dt R d rate ] [ ] [ 2 1 = = In general, for the reaction: aA + bB cC + dD dt D d d dt C d c dt B d b dt A d a rate ] [ 1 ] [ 1 ] [ 1 ] [ 1 = = = = depletion appearance Units for reaction rates? …………………….
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Reaction order and rate constant Relationship between the rate and the concentration of the reactant Rate α [A] x [B] y Not necessarily stoichiometric terms Rate = k [A] x [B] y Rate constant Is the rate constant affected by the order of the reaction? …………………. . Example
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This note was uploaded on 05/29/2011 for the course CHM 3400 taught by Professor Seabra during the Spring '08 term at University of Florida.

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110223 - Chemical kinetics (Chapter 9 311-324) Reaction...

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