Chem 122 Final Review

Chem 122 Final Review - Final Exam Important Concepts Ch 13...

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Final Exam Important Concepts Ch. 13 A zero-order reaction is independent of the concentration of the reactants. Zero- order reactions have the following features: 1 The concentration versus time graph is a straight line with a negative slope; this negative slope represents the rate constant of a reaction. 2 The rate of the reaction is equal to the rate constant. 3 The units of k and the rate of reaction are mol L^ 1 s^ 1 Photochemical reactions and surface reactions are examples of zero-order reac- tions. Integrated rate law for a zero-order reaction The integrated rate law for a chemical reaction is a relationship between the con- centrations of the reactants and time. Consider a single reactant A decomposing into products: A products . For a zero-order reaction, rate= k Because the rate of the reaction is −Δ [A]/ Δ t , the above rate law can be written as    Δ [A]  =k Δ On integrating this differential equation, the integrated rate law for a zero-order reaction is obtained: [A]t= kt +[A]0
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