Lecture6 - Elementary reactions Reactions of interest are...

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1 Physical Chemistry Lecture 6 Reaction mechanisms and reaction-velocity predictions Elementary reactions Reactions of interest are often complex 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 “Simple” reaction sequences Reversible two-step reaction Irreversible sequential two-step reaction Irreversible parallel two-step reaction AB B C a product k k 1 2  () BA k k f r AC k k 1 2 Mathematics of simple reaction sequences Reversible two- step Both first order Irreversible parallel Both first order vk A k A 12 [] A k B fr Two-step irreversible process Both steps first order Exactly soluble Gives complex result Can be understood qualitatively, as well as quantitatively B C a product k k 1 2 Reaction mechanism A description of the course of a reaction that
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Lecture6 - Elementary reactions Reactions of interest are...

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