Chem_208_Lecture_8_BW

Chem_208_Lecture_8_BW - PS3 due Friday at 2PM Dont forget...

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1 PS3 due Friday at 2PM Don’t forget your name, lab TA name, lab day Today Finishing 14.10
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2 Temperature Dependence of k • Rate constants (k) for many reactions vary with temperature according to the Arrhenius Equation: RT E a Ae k / = RT E A k a = ln ln Plot of ln k vs 1/T is linear. Slope = -E a /R Intercept = lnA. E a = Activation Energy A = “A factor” = Pre- exponential factor
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3 Why don’t all exothermic reactions occur immediately? N 2 O (g) + NO (g) N 2 (g) + NO 2 (g) , Δ H = -139kJ
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4 Why don’t all exothermic reactions occur immediately? N 2 O (g) + NO (g) N 2 (g) + NO 2 (g) , Δ H = -139kJ
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Half Life of Reaction (t 1/2 ) • Time taken for reactant concentration to decrease to half of initial value. • For first order reaction: k k t 693 . 0 2 ln 2 / 1 = = Half life (t 1/2 ) is constant for first order reaction. Tritium ( 3 H) decays with a half life (t 1/2 ) of 12.5 years. What is k in s -1 ? How long does it take for 1.00 g to decay: a) to 0.25 g? b) to 0.010 g?
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Chem_208_Lecture_8_BW - PS3 due Friday at 2PM Dont forget...

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