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Chem_208_08_2007_web

Chem_208_08_2007_web - TODAY Finishing up 14.8 14.9...

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Unformatted text preview: TODAY: Finishing up 14.8, 14.9, Starting 14.10 TUES: Finishing Chapter 14 (Skipping pages 606-608) Missed Lab: Entire Lab Can be done next week Missed Recitation: Go to any recitation this week Summary Zero Order: Plot of [A] vs. time is linear First Order: Plot of ln[A] vs. time is linear Second Order: Plot of 1/[A] vs. time is linear. 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 . 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? 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....
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Chem_208_08_2007_web - TODAY Finishing up 14.8 14.9...

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