Lec-06-Chap13-2

Lec-06-Chap13-2 - Lec-06-Chap13-2 9/13/2009 Lec-06:...

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Lec-06-Chap13-2 9/13/2009 Chemical Kinetics Rect. Mechanisms. Arrhenius Eq., etc. 1 Rate Laws for Chemical Reactions Chemical reactions, described by stoichiometric “overall” equations: + A CD B cd ab The overall reaction equation describes the identity and proportions in which the reactant species are consumed and the identity and proportions in which the product species are generated . 1 Lec-06: Reaction Mechanism and Rate Laws Chapter 13 Rate Laws - continued         rate constant A 1 rat AB = e m t t n t d t k a dt The rate law , frequently of the form reflects instead the detailed series of elementary reaction steps by which the chemical reaction proceeds . Consider the reaction         2 2 3 2 2 2 I aq H O aq 2H O I aq 4H O  The rate law is found experimentally to be     22 I rate HO t t k t   2 If it was based on the overall balanced equation we would guess   2 2 3 rate(t) I H O H O k    
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Lec-06-Chap13-2 9/13/2009 Chemical Kinetics Rect. Mechanisms. Arrhenius Eq., etc. 2 Rate Laws and Reaction Mechanisms The rate law is a consequence of the following detailed reaction mechanism hyp 22 2 32 oiodous acid O H O I HOI H OH II 2H O 4H H OI O O H 2          2 2 3 2 2 2 I aq H O aq I aq 4H O  3 Intermediary Species: They do not participate on the overall equation     I rate HO t t k t   Elementary steps or reactions There are two only two important types of elementary reactions: Elementary Reactions a different Unimolecula partic the structure of rearranges to produce or .
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Lec-06-Chap13-2 - Lec-06-Chap13-2 9/13/2009 Lec-06:...

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