AECH 111 Lecture : 14webct Chemical Kinetics.pdf

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In order to react, molecules must come f th l t t t t in contact with each other. The more homogeneous the mixture of reactants, the faster the molecules can react: concentration of reactants. As the concentration of reactants increases, so does the likelihood that reactant molecules will collide. At higher temperatures, reactant molecules have more kinetic energy, move faster, and collide more often and with greater energy. gy g: presence of a catalyst, presence of a catalyst. Catalysts speed up reactions by changing the mechanism of the reaction. Catalysts are not consumed during the course of the reaction. Rates of reactions can be determined by monitoring the change in concentration of either reactants or products as a function of time. In this reaction, the concentration of butyl chloride, C4h9cl, was measured at various times various times. The average rate of the reaction over each interval is the change in concentration divided by the change in time: in time:

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