Experiment 15: A Kinetic Study of an Iodine Clock Reaction Name ___________________ Prelab First, make the following changes in your handout. Put Eq 15.11 into the ln form, not base log10: ln k = -Ea/R(1/T) + constant In the line right above Materials and Chemicals: EA can be obtained from the slope (-EA/R) For all experiments in Part A, how many millimoles of persulfate ion have reacted by the time the blue color appears? [Equation 15.6 is useful] Show your calculation work. In addition to the effects of catalysts, what other factors can influence the rate of a chemical reaction? What is meant by the term ?rate controlling step? of a chemical reaction? How is the molecularity of the rate controlling step related to the overall reaction order? How will a decrease in temperature affect the rate of a reaction (increase, decrease, no effect)? Explain. From the data below, calculate the rate law expression for the reaction A + B ( C Experiment Initial [A] Initial [B] Time (s) Rate, 1/t (s-1) 1 0.100 M 0.100 M 30 2 0.200 M 0.100 M 15 3 0.200 M 0.050 M 60
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