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Le Châtelier’s Principle

Le Châtelier’s Principle. Le Châtelier’s Principle. If stress is applied to a system the system shifts to relieve the stress. Change in Concentration. Mountains and mole-hills: If stress is added the reaction must shift in the opposite direction to “remove” the mountain

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Le Châtelier’s Principle

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  1. Le Châtelier’s Principle

  2. Le Châtelier’sPrinciple • If stress is applied to a system the system shifts to relieve the stress

  3. Change in Concentration • Mountains and mole-hills: • If stress is added the reaction must shift in the opposite direction to “remove” the mountain • If stress is removed the hole must shift in the same direction to “fill in” the hole

  4. Change in Concentration • Which direction will the reaction shift if the concentration of CO is increased? To even out the pile it must shift right

  5. Change in Concentration • Which direction will the reaction shift if the concentration of CO is decreased? To even out the pile it must shift left

  6. Change in Concentration • Which direction will the reaction shift if the concentration of CH4is increased? SHIFT LEFT

  7. Change in Concentration • Which direction will the reaction shift if the concentration of H2 is decreased? SHIFT LEFT

  8. Change in Concentration • Which direction will the reaction shift if the concentration of H2O is decreased? SHIFT RIGHT

  9. Change in Concentration • Which direction will the reaction shift if the concentration of H2 is increased? SHIFT RIGHT

  10. Changes in Volume • Remember that decreasing volume is also increasing pressure • If pressure is increased, the reaction shifts to the side with the least amount of moles

  11. Changes in Volume • What will happen if volume is decreased?

  12. Changes in Volume The reaction shifts towards the right to relieve stress

  13. Changes in Volume • Which direction will the reaction shift if the volume is decreased? There would be no change because there are equal moles on each side!!!

  14. Changes in Temperature • Temperature changes like concentration…mountains and mole-hills 

  15. Changes in Temperature • Which direction will the reaction shift if heat is added? • What will happen if heat is removed?

  16. Changes in Temperature

  17. Just a Note… • If heat is on the right side of the reaction, it is exothermic • If heat is on the left side of the reaction, it is endothermic

  18. Review

  19. Review

  20. Review

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