Lec-05-Chap13-1

Lec-05-Chap13-1 - Lec-05-Chap13-1 Lec-05 Chemical Kinetics...

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Lec-05-Chap13-1 9/11/2009 Chemical kinetics Reaction rates. Rate law. Reaction order 1 Lec-05: Chemical Kinetics Rates of Chemical Reactions Chapter 13 Reaction Rate: the change in the concentration of a reactant or product per unit time.     or A C t t are measures of the average rate of the reaction. + A CD B cd ab 1 Units of   mol mol ss Rate of a Chemical Reaction       viole color t less OH aq CVOH aq CV aq  The intensity of the violet color (due to the presence of CV + ) decreases with time, as the reaction progresses. 2
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Lec-05-Chap13-1 9/11/2009 Chemical kinetics Reaction rates. Rate law. Reaction order 2 Rate of a Chemical Reaction - continued     + OH CV a Hq q CVO a  Concentration [CV + ] decreases with time Time t (s) [CV + ] (mol/ℓ) 0 5.00 ×10 -5 10 3.68 ×10 -5 20 2.71 ×10 -5 30 1.99 ×10 -5 40 1.46 ×10 -5 50 1.08 ×10 -5 60 7.93 ×10 -6 80 4.29 ×10 -6 100 2.32 ×10 -6 3 Rate of a Chemical Reaction - continued 4
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Lec-05-Chap13-1 9/11/2009 Chemical kinetics Reaction rates. Rate law. Reaction order 3 Rate of a Chemical Reaction - continued Given that the molar concentration [CV + ] changes with time, we focus on the rate by which [CV + ] changes     ++ + CV CV [CV ] average rate t t t t tt t     Average rate: because we calculate it using finite differences for the concentration and the time. 5 To define the rate of reaction positive we multiply the rate of change of [CV + ] by (-1). Rate of a Chemical Reaction - continued rate decreases with time Time t (s) [CV + ] mol/ℓ Ave. Rate (mol/ℓ s) 0 13.2 ×10 -7 10 9.70 ×10 -7 20 2.71 ×10 -5 7.20 ×10 -7 30 1.99 ×10 -5 5.30 ×10 -7 40 1.46 ×10 -5 3.80 ×10 -7 50 1.08 ×10 -5 2.85 ×10 -7 60 7.93 ×10 -6 1.82 ×10 -7 80 4.29 ×10 -6 9.85 ×10 -8 100 2.32 ×10 -6 55 mol 3.68 10 5.00 10 10s 6   CV average rat V e C t t t t t
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Lec-05-Chap13-1 9/11/2009 Chemical kinetics Reaction rates. Rate law. Reaction order 4 Rate of a Chemical Reaction - continued 7
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This note was uploaded on 01/02/2010 for the course CHE 132 taught by Professor Hanson during the Fall '08 term at SUNY Stony Brook.

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Lec-05-Chap13-1 - Lec-05-Chap13-1 Lec-05 Chemical Kinetics...

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