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Chapt. 15: Chemical Kinetics
by Terrence Oas
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Chapt. 15: Chemical Kinetics

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Reaction Rates

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Catalysis

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Rate Laws: A Summary

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Rate Laws: An Introduction

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Reaction Mechanisms

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A Model for Chemical Kinetics

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Determining the Form of the Rate Law

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The Steady-State Approximation

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The Integrated Rate Law

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Rate=Change in Concentration/Time interval

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Thermo: IF Kinetics: WHEN & HOW

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Avoid complex kinetics by measuring initial rates

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Rate Law: Rate=k[R]^n k & n must be determined experimentally

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The rate law can provide information about the elementary steps of a reaction

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Order=Sum of Exponents of Rate Law

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1st order half-life is independent of time or reactant concentration, 2nd order is not

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Pseudo-first-order: make one reactant in a multireactant rxn rate-limiting

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To test a proposed mechanism, compare the rate law of its slowest step with the experimentally determined rate law

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Key Terms: elementary step, intermediate, molecularity & rate determining step

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Reaction mechanisms can't be proven

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At equilibrium: Keq=kforward/kreverse

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Steady state: Rate of I production = Rate of I consumption

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k=AExp(-Ea/RT)

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Reaction Energy Diagram

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Catalysts create a new reaction pathway with a lower activation energy

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