604Mechanisms

604Mechanisms - Reaction mechanisms A reaction mechanism is...

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Lesson 29 1 Lesson 29 Reaction mechanisms A reaction mechanism is a step-by-step description of a chemical reaction at molecular level Each step in a mechanism is called an elementary reaction Reaction mechanisms must agree with the overall stoichiometric equation for the reaction Reaction mechanism should agree with the experimentally determined rate laws for the reaction Reaction mechanisms are proposed based on experimental data – It is very difficult, if not impossible, to infer a reaction mechanism from the overall chemical equation alone Lesson 29 Elementary reactions • Elementary reactions are classified as: – Unimolecular: A → products (dissociation) – Bimolecular: A + B → products (bimolecular collision) – Termolecular: A + B + C → products (very rare) • For elementary reactions, the order of the reaction with respect to a given reagent equals the stoichiometric coefficient of the reagent: aA + bB → products r = k [ A ] a [ B ] b Lesson 29 Elementary reactions Some elementary process are reversible and, therefore, can be treated using the laws of chemical equilibrium already covered in this course Intermediates are chemical species produced in one elementary reaction that are consumed in another elementary reaction Intermediates should not appear in the overall
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604Mechanisms - Reaction mechanisms A reaction mechanism is...

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