Lec 10 Jan 26 Mon - 2.3 2 Le Chateliers Principle(15-6 If a...

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2.3 2. Le Chatelier’s Principle (15-6) If a change is imposed on a system at equilibrium, the position of the equilibrium will shift in the direction that tends to reduce that change. A. Change in concentration changes Q (1) Increase gas pressure or increase concentration, equilibrium shifts to consume that substance. (2) Remove that substance, equilibrium shifts to create more of it. (3) Add solids or liquids, no change is equilibrium as these components do not appear in Q expression. (4) Add an inert gas (not involved in the reaction), no change in equi- librium since partial pressures of species in reaction don’t change Add B, rxn Conc. Reaction progress 2 A + B C B C A Equilibrium re-established K is unchanged B. Change in volume for gases changes Q Increase volume: equilibrium shifts to increase total number of gas molecules Decrease volume: equilibrium shifts to decrease total number of gas molecules 2 SO 2 (g) + O 2 (g) 2 SO 3 (g) if container volume is: increased : system shifts left . decreased
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Lec 10 Jan 26 Mon - 2.3 2 Le Chateliers Principle(15-6 If a...

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