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Note for CHEM 122 at UMass(7)

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This 1 page Class Notes was uploaded by an elite notetaker on Friday February 6, 2015. The Class Notes belongs to a course at University of Massachusetts taught by a professor in Fall. Since its upload, it has received 15 views.

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Date Created: 02/06/15
The Initial Rate Method Points I looked for when grading 1 What is the initial Rate 2 How is it determined 3 How are the orders for each reactant determined 4 How is k determined The Initial Rate Method is a procedure used to determine the rate law for a chemical reaction It consists of running a series of experiments where the initial concentration of each reactant is systematically changed and the concentration of one of the reactants or products is followed as a function of time All concentrations are related by the stoichiometry only need to follow one The initial rate of the reaction is the instantaneous rate at the very beginning of the reaction and is determined for each experiment by nding the slope of the line tangent to the curve of a concentration vs time graph measured at t 0 A Initial Rate 7 Slope of tangent line art 0 time From the generalized rate law Rate kAquotBy the order with respect to each reactant can be determined because the ratio of the initial rates for two different experiments is equal to the ratios of the initial concentrations raised to their orders X y AL BL Rate Rate By systematically varying the initial concentrations of A and B the exponents x y can be determined This can be done by inspection or by taking the logarithm of both sides of the equation and solving for x or y Once the orders are known the rate constant can be found by rst calculating k for each experiment they should be very close to one another Rate AfB3 and then averaging these values

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