CHE116_Lecture4_2011

CHE116_Lecture4_2011 - Chemistry Chemistry116 Lecture4...

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hemistry 116 Chemistry 116 Lecture 4 Topics: Reaction Mechanisms Catalysis Chapter 14.6 14.7
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ctivation Energy Activation Energy In other words, there is a minimum amount of energy required for reaction: the activation energy, E . a Just as a ball cannot get over a hill if it does not roll up the hill with enough energy, a reaction cannot occur unless the molecules possess sufficient energy to get over the activation energy barrier .
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Reaction Coordinate Diagrams It is helpful to sualize energy visualize energy changes throughout a process on a reaction coordinate diagram like this ne for the one for the rearrangement of ethyl onitrile methyl isonitrile. methyl isonitrile acetonitrile
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Reaction Coordinate Diagrams The diagram shows the nergy of the reactants energy of the reactants and products (and, therefore, E ). The high point on the diagram is the ansition state transition state. The species present at the transition state is called e ctivated complex the activated complex . The energy gap between the reactants and the activated mplex is the ctivation energy arrier (E complex is the activation energy barrier (E a ) . lower E a = faster reaction rate
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iClicker Question ank the reactions from owest stest Rank the reactions from slowest to fastest . A. 3, 2, 1 3 2 lower E = faster reaction rate B. 1, 3, 2 C. 2, 3, 1 2 3 a higher E a = slower reaction rate The value of Δ E does not matter. D. 1, 2, 3
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eaction Mechanisms Reaction Mechanisms e quence of events The sequence of events that describes the actual rocess by which process by which reactants become roducts is called the products is called the reaction mechanism .
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This note was uploaded on 02/10/2011 for the course CHE 116 taught by Professor Staff during the Spring '08 term at Syracuse.

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CHE116_Lecture4_2011 - Chemistry Chemistry116 Lecture4...

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