12 - Chemical Kinetics

12 - Chemical Kinetics - Chapter 12 Chemical kinetics the...

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Chapter 12 - Chemical kinetics – the area of chemistry that concerns reaction rates. - Understanding the steps by which a reaction takes place (reaction mechanism) o Main ideas of chemical kinetics Rate laws, reaction mechanisms, and simple models for chemical reactions 12.1 Reaction Rates - Definition – the change in concentration of a reactant or product per unit time - - Reaction rates are positive; they aren’t constant, but rather changes with time. - Rate of a reaction is not constant, but rather changes with time because the concentrations change with time. - Average rates - Instantaneous rate – the value of the rate at a particular time; it can be obtained by computing the slope of a line tangent to the curve at that point. - 12.2 Rate Laws - Reaction rate will depend only on the concentrations of the reactants. - Rate law – shows how the rate depends on the concentrations of reactants. o o Rate constant – proportionality constant (k) o Order (n) o The concentrations of the products do not appear in the rate law because the reaction rate is being studied under conditions where the reverse reaction does not contribute to the overall rate.
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o The value of the exponent n must be determined by experiment; it cannot be written
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This note was uploaded on 02/09/2009 for the course CHEM 105BLG taught by Professor Parr during the Spring '08 term at USC.

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12 - Chemical Kinetics - Chapter 12 Chemical kinetics the...

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