12 Reaction Mechanisms

12 Reaction Mechanisms - A unimolecular decomposition...

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1 ± A unimolecular decomposition reaction displays zero-order kinetics. It therefore follows that a plot of _________ vs time is linear, and the slope of the line equals ________. A) [reactant] –k B) [reactant] +k C) [reactant] -1 D) [reactant] -1 E) ln [reactant] –k [A] t = - k t + [A] 0 ln [A] t = - k t + ln [A] 0 0 11 [] t kt A A =+ 2 Announcement ± On Monday bring your Foundations of Chemistry activity book! ± The lecture will follow Activity #30: Activation Energy & Catalysis
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3 ± This rate law Rate = k [A] 2 [ B] [C] does not necessarily indicate that 4 molecules collide simultaneously and react. ± Rather, the rate law is determined by the reaction mechanism. ± Four molecules colliding simultaneously and reacting is one mechanism consistent with this rate law, but such an event is very improbable. ± How many times have you seen four automobiles collide simultaneously at an intersection? 4 Reaction Mechanisms ± A reaction mechanism is a series of elementary reactions. ± Elementary reactions are either a unimolecular (1) or a bimolecular (2) reaction. ± Its very improbable for more than 2 molecules to collide simultaneously with enough energy and orientations favorable for reaction.
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5 Rate Law for a Unimolecular Elementary Reaction ± First order ± Occurs when one molecule dissociates or rearranges into a different structure. ± Dissociation: O 3 Æ O 2 + O ± Rate = k [O 3 ] 6 Rate Law for a Bimolecular Elementary Reaction ± Second order ± Occurs when 2 particles (atoms or molecules), collide with each other and react.
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12 Reaction Mechanisms - A unimolecular decomposition...

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