Kinetics: Rates and Mechanisms of Chemical Reactions16.1 Factors That Influence Reaction Rates16.2 Expressing the Reaction Rate16.3 The Rate Law and Its Components16.4 Integrated Rate Laws: Concentration Changes over Time16.7 Reaction Mechanisms: Steps in the Overall Reaction16.8 Catalysis: Speeding Up a Chemical Reaction16.5 The Effect of Temperature on Reaction Rate16.6 Explaining the Effects of Concentration and Temperature
Reaction Kinetics: Basic Concepts•Need to know if reaction will occur or not (spontaneous) ΔG•Need to know how fast a reaction will occur kineticsFactors that affect reaction rates:•Collision frequency (concentrations of reactants)•Orientation factors (must have correct alignment)•Energy of collision must be sufficient to overcome energy barriers to reaction (e.g. bond breaking)Kinetics provide microscopic information on how reactions occur…reaction mechanisms = control
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Review of Previous Lecture•O3hole….saga of Science and kinetics done right•Free Energy only tells if a reaction will occur not how fast it will occur•Reaction rates are determined by collision frequency, orientation, and probability reactants have sufficient energy to overcome a barrier (energy needs to be put into collision to overcome other bond energies …at least….activation barrier•Rate expressions relate how fast a reactant is consumed or product formed……gives information on microscopic details of the reaction (atomic dance partners)