Ch 6 Fri Nov 4 Prof Reid

Ch 6 Fri Nov 4 Prof Reid - 11/2/2011 Chem 142: Lecture 16...

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11/2/2011 1 Chem 142: Lecture 16 What is Equilibrium? (6.1) Activity (6.4) The Equilibrium Constant (6.2)    i ref I a I    3 22 2 3 NH NH a K aa Chemical Equilibrium To this point we have assumed that all chemical reaction go to completion. That is, a chemical reaction is “complete” when all the reactions to go to products. Not all reactions go to completion. Even after an infinitely long time, some reaction systems will remain mixtures of reactants and products. The reaction system includes includes… Concentrations/pressures of all species Temperature Each reaction system has an equilibrium position at which the concentrations of all species are constant for all time (assuming no perturbations).
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11/2/2011 2 The Great Crabapple War Annoying Little Boy (B) vs. Crotchety Old Man (M) Annoying Little Boy throws crabapples at rate B Crotchety Old Man throws crabapples at rate M Who will “win”? Annoying Little Boy is faster at collecting crabapples than Crotchety Old Man k B > k M Initial concentration is higher in Crotchety Old Man’s yard c B < c M rate B = k B x c B rate M = k M x c M The Great Crabapple War in Pictures PHASE I: Preparing for battle Man (M) Boy (B) Boy’s parents have asked him to clean up the backyard which he decides to accomplish by throwing the crabapples into the neighbors back yard.
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11/2/2011 3 PHASE II: Boy’s opening offensive c M Boy throws apples at rate B = k B c B , where k B represents the speed at which the boy collects apples from the ground, and c B is number of apples on the boy’s side of the fence. c B k B The Great Crabapple War (cont.) PHASE III: Man’s counter- offensive c M Man returns fire at rate M = k M c M . Notice that the speed at which the man throws is slower than that of the boy, but the number of apples on the man’s side of the fence is greater.
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Ch 6 Fri Nov 4 Prof Reid - 11/2/2011 Chem 142: Lecture 16...

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