Download PDF by M. Mortimer, P.G. Taylor: Chemical Kinetics and Mechanism

By M. Mortimer, P.G. Taylor

ISBN-10: 0854046704

ISBN-13: 9780854046706

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What are the partial orders with respect to these reactants and the overall order of reaction? The experimental rate equation is J = kfJs~o,'-][r-] In this equation the concentration of S2OX2-is raised to the power of 1 ; the partial order with respect to S2082-is therefore 1 and the reaction is first-order in S20x2-. Similarly, the partial order with respect to I- is 1 and the reaction is therefore also first-order in this reactant. The overall order is n = 1 + I = 2, that is second-order overall.

4b the data points are located in a region of the graph lying far from the intercept and to determine this value a long extrapolation is required. The accuracy of this extrapolation will depend critically on the quality of the experimental data. 4a, but with an extended scale, so that the origin is included. 51 Any small uncertainty in the slope of the line will result in a much greater uncertainty in the intercept. 4a can introduce fairly significant uncertainties and, for this reason, it is not recommended.

How would you determine the rate of change of concentration with time for BrO- at 1500s? The rate will be equal to the slope of the tangent drawn to the curve at 1 500 s. This will measure the instantaneous rate of change and will be represented by d[BrO-Ildt. (If you are uncertain about any aspect of this answer you should look again at Section 1. 3 plots a kinetic reaction profile for BrO- and shows the tangent drawn to the curve at 1 500 s. 1 at 25 "C. A smooth curve is drawn through the experimental data points and the tangent is drawn at 1500s.

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Chemical Kinetics and Mechanism by M. Mortimer, P.G. Taylor


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