Lecture7 - Finding reaction velocity Physical Chemistry...

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1 Physical Chemistry Lecture 7 Multi-step reaction mechanisms Elementary reactions Reactions are often more complex than indicated by the beginning and ending states alone Some reactions do occur in a single step -- elementary reactions Generally involve simple mono- or bimolecular interactions Order in elementary reactions is the stoichiometry number Examples: H 2 + O H 2 O H + Br HBr Reaction mechanism A description of the course of a reaction in terms of elementary reactions Example from Bodenstein’s work: Reaction mechanisms are not necessarily unique 5 2 4 2 3 2 2 2 1 2 2 v Br Br Br v Br H HBr H v Br HBr Br H v H HBr H Br v Br Br ) ( 2 ) ( ) ( 2 2 g HBr g Br g H Finding reaction velocity One knows the form of the reaction rate for every elementary reaction Express disappearance of reactant or appearance of product in terms of the rates of these elementary steps Include terms for every step that affects reactants
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Lecture7 - Finding reaction velocity Physical Chemistry...

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