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Ch 6_Part 4_111311 - Le Chtelier's Principle"If a change in...

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1 11/13/2011 Le Châtelier’s Principle “If a change in conditions (a “stress”) is imposed on a system at equilibrium, the equilibrium position will shift in a direction that tends to reduce that change in conditions. A + B C + D + Energy For example: In the reaction above, if more A or B is added you will force the reaction to produce more product ; if either is removed , the reaction will shift to form more reactants . If C or D is added you will force the reaction to form more reactants , if either is removed , the reaction will shift to form more products . If it is heated you will get more reactants, and if cooled , more products . Factors that control the position of chemical equilibria are: Concentration Pressure Temperature NOTE: catalysts influence rate, not position of equilibrium Equilibrium Position
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