5_60_lecture31

5_60_lecture31 - MIT OpenCourseWare http:/ocw.mit.edu 5.60...

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MIT OpenCourseWare http://ocw.mit.edu 5.60 Thermodynamics & Kinetics Spring 2008 For information about citing these materials or our Terms of Use, visit: http://ocw.mit.edu/terms .
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5.60 Spring 2008 Lecture #31 page 1 Complex Reactions and Mechanisms Mechanisms: A series of elementary steps that make up a reaction. e.g. for A + B + 2C D + E Mechanism could be: A + B F Elementary F + C G + D Single Step G + C E Reactions F and G are reaction intermediates Molecularity: The number of molecules that come together to react in one elementary step For single step elementary reactions, Molecularity = Order A products 1 st order rate = k[A] Unimolecular A products 2 nd order rate = k[A] 2 Bimolecular A + B prod. 2 nd order rate = k[A][B] Bimolecular A + B + C prod. 3 rd order rate = k[A][B][C] Termolecular
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5.60 Spring 2008 Lecture #31 page 2 Some Simple Mechanisms
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5_60_lecture31 - MIT OpenCourseWare http:/ocw.mit.edu 5.60...

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