Kinetics+Part+2 - 1 Kinetics Part 2 The Rate Law and its...

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The Rate Law and its Components We will consider reactions for which the products do not appear in the rate law. For these cases the reaction rate depends only on reactant concentrations and temperature. First, we consider the effect of concentration on rate for reactions occurring at a fixed temperature. a A + b B → c C + d D Rate = k [A] m [B] n The rate constant , k , is specific for a given reaction at a given temperature. It does not change as the reaction proceeds. However, k does change with temperature and therefore determines how temperature affects rate. The exponents m and n are the reaction orders . They define how rate is affected by reactant concentration. If the rate quadruples when [B] is doubled then the rate depends on [B] 2 so n = 2. In a reaction where the rate does not depend on [A], we say the reaction is zero order or [A] 0 . Note that the coefficients a and b in the general balanced equation are not necessarily related in any way to the reaction orders m and
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Kinetics+Part+2 - 1 Kinetics Part 2 The Rate Law and its...

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