lecture 16 - chem

lecture 16 - chem - General & Analytical Chemistry II...

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1011-216 Winter 2008/2009 Lecture 16
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Reaction Mechanism • Most chemical reactions proceed through a series of interconnected steps. KMnO 4 ÆÆ MnO 3 3- ÆÆ Mn 2+ purple red yellow • Reaction mechanisms – the exact molecular pathway that starting materials follow on their way to becoming products. • Each step in a multi-step reaction is called an elementary step.
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Elementary reactions • Elementary reactions are classified by their molecularity. • Molecularity – the number of molecules (or atoms) on the reactant side of the chemical equation for the elementary reaction. A Æ Products Unimolecular A + B Æ Products, 2A Æ Products Bimolecular A + B + C Æ Products, 2A + B Æ Products Termolecular
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Reactions of N 2 O 4 Unimolecular Reaction Bimolecular Reaction
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• Elementary reaction – describes the behavior of the individual molecules • Overall reaction – describes the reaction stoichiometry • Reaction intermediate : species only present in the elementary reactions, formed in one step and consumed in another • Rate-determining step (RDS) – the elementary reaction in a mechanism that controls the overall rate. Step 1: NO
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lecture 16 - chem - General & Analytical Chemistry II...

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