Chapter 17 Chemical Kinetics lecture notes

Chapter 17 Chemical Kinetics lecture notes - Click to edit...

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Click to edit Master subtitle style 9/8/10 CHEMICAL KINETICS CHAPTER 17, Kinetics 11
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Click to edit Master subtitle style 9/8/10 KeKin Kinetics vs Thermodynamics A: Reactants B: Transition state C: products E: Forward Activation Free Energy F: Reverse Activation Free Energy
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9/8/10 Most reactions occur through several steps and are not single step reactions. Each step in a multi-step reaction is called an elementary reaction. Types of elementary reactions 1. Unimolecular (a single reactant) 33 Reaction Mechanisms
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9/8/10 Each step of this reaction is an “elementary step”. Each elementary step has reactant(s), a transition state, and product(s).
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9/8/10 55 Reaction Rates: To measure a reaction rate we could monitor the disappearance of reactants or appearance of products. e.g., 2NO2 + F2 → 2NO2F
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9/8/10 66 Gen. Rxn: aA + bB → cC + dD t D d t C c t B b t A a rate ] [ 1 ] [ 1 ] [ 1 ] [ 1 = + = - = - = t X t t X X i f i f ] [ ] [ ] [ rate average = - - = NO2 + CO → NO + CO2
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9/8/10 77 Order of a Reaction The power (n) to which the concentration of A is raised in the rate expression describes the order of the reaction with respect to A. k[A] rate Products k aA n e.g., = → Do not confuse the order (n) with the stoichiometric coefficient (a).
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9/8/10 88 mth order in [A] nth order in [B] Obj103 Obj104
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9/8/10 99 Obj105 [A] (mol L-1) [B] (mol L-1) Rate (mol L-1 s-1) 1 1.0x10-4 1.0x10 -4 2.8x10 -6 2 1.0x10-4 3.0x10 -4 8.4x10 -6 3 2.0x10-4 3.0x10 -4 3.4x10 -5
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9/8/10 1010 [A] (mol L-1) [B] (mol L-1) Rate (mol L-1 s-1) 1 1.0x10-4 1.0x10 -4 2.8x10 -6 2 1.0x10-4 3.0x10 -4 8.4x10 -6 3 2.0x10-4 3.0x10 -4 3.4x10 -5 Obj106
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9/8/10 Example: At elevated temperatures, HI reacts according to the chemical equation 2HI H2 + I2 The rate of reaction increases with concentration of HI, as shown in this table.
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This note was uploaded on 09/07/2010 for the course CHEM 1310 taught by Professor Cox during the Fall '08 term at Georgia Institute of Technology.

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Chapter 17 Chemical Kinetics lecture notes - Click to edit...

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