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Le Chatlier’s Principle

Le Chatlier’s Principle. Le Châtelier’s Principle. Le Châtelier’s Principle : if stress is applied to a system in dynamic equilibrium, the system changes to relieve the stress 3 types of stress Concentration Temperature Pressure Website Demo:

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Le Chatlier’s Principle

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  1. Le Chatlier’s Principle

  2. Le Châtelier’s Principle • Le Châtelier’s Principle: if stress is applied to a system in dynamic equilibrium, the system changes to relieve the stress • 3 types of stress • Concentration • Temperature • Pressure • Website Demo: http://www.mhhe.com/physsci/chemistry/essentialchemistry/flash/lechv17.swf

  3. Le Châtelier’s Principle • Concentration • Example: Carbonic Acid • What will happen if… • I add CO2? • Make more reactants because more collisions with the products will occur • A stress was applied and the system compensated for this change • What will removing CO2 do? • Shift to make more products Add CO2 H2CO3 CO2 + H2O Remove CO2

  4. Le Châtelier’s Principle • Temperature • Think of heat as a reactant or product based on if the reaction is exothermic or endothermic • Example: exothermic formation of SO3 Add heat 2SO2 + O2 2SO3 + heat Remove heat Exothermic Reaction: (think of heat as a product) Endothermic Reaction: (think of heat as a reactant) increase temperature = shift toward reactants increase temperature = shift toward products

  5. Le Châtelier’s Principle • Pressure • Only affects equilibrium that has an unequal number of moles of gaseous reactants and products • Example: Formation of ammonia Decrease Pressure N2 + 3H2 2NH3 Increase pressure

  6. Activity… • Due today • Turn in 1 per pair of students • All waste can go down the drain

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