CHM 13 Ppt. 2

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DesLee26
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208631
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CHM 13 Ppt. 2
Updated:
2013-03-20 21:26:11
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CHM 112
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Dr. C
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  1. What is Le Chatelier's Principle
    if a stress is applied to a system at equilibrium, the system adjusts in such a way as to relieve the stress
  2. What can be changed to relieve stress?
    • the concentration of reactants or products can be changed
    • the pressure and volume can be changed
    • the temperature can be changed
  3. Concentration changes: 
    The concentration stress is added..
    the concentration stress of an added reactant or product is relieved by reaction in the direction that consumes the added substance
  4. Concentration Changes:
    the concentraiton stress is removed
    the concentration stress of a removed reactant or product is relieved by reaction in the direction that replenishes the removed substance
  5. Volume and Pressure Changes
    • only reactions containing gases are affected by changes in volume and pressure
    • Increaising pressure= decreasing volume
  6. What does PV=nRT tell us?
    that increasing pressure or decreasing volume INCREASES concentration
  7. In general, when an equilibrium is distubred by a chagne in volume which results in a corresponding change in pressure, what does Le Chatelier's principle predict?
    • an increase in pressure by reducing the volume will bring about net reaction in the direction that decreases the number of moles of gas
    • a decrease in pressure by expanding the volume will bring about net reaction in the direction that increases the number of moles of gas
  8. If Qc > K, what?
    the product is too high and the reaction progresses in the reverse direction
  9. If Qc< kc, what?
    more reactans wil be consumed and the net reaction will be from left to right
  10. Temperature changes:
    changes in temperature can change the equilibrium constant
  11. Endothermic and exothermic in terms of temperature changes
    • endo= favored when temperature increases
    • exo= favored when temperature decreases
  12. In general, when an equilibrium is disturbed  by a change in temperature, what does Le Chatelier's principle predict?
    • the equilibrium constant for an exothermic reaction (negative delta H) decreses as teh temperature increses
    • the equilibrium constant for an endothermic reaction (positive delta H) increses as the temperature increases

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