Chem 112

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Author:
tessaj21
ID:
48489
Filename:
Chem 112
Updated:
2010-11-09 14:45:07
Tags:
equilibrium expressions le chateliers principle chem test
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Description:
Writing expressions, manipulating expressions & stress on K
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  1. What do you ignore in the rection when writing equilibrium expressions?
    Solids & Liquids
  2. How will the solutions be written? (in what form of concentration i.e. moles, molality, etc..)
    Molarity
  3. What do these brackets [] stand for in equilibrium expressions?
    The concentration of the ion in Molarity
  4. K= What over What?
    Products/Reactants
  5. Rewrite this using the equilibrium expression: aA+bB=cC+dD
    [C]^c[D]^d/[A]^a[B]^b
  6. If Q < K, then _________
    Reactants -> Products.. Shifts to the right
  7. If Q = K, then ______.
    Equilibrium is reached
  8. If Q > K, then _______.
    Products -> Reactants.. Shift to the left
  9. If K < 1, then _______.
    Reactants are favored
  10. If K > 1, then ________.
    Products are favored
  11. If we multiply a reaction by N, then what is the new formula for K?
    Knew=(kold)n N=the # that changed the reaction
  12. If the reaction is reversed, then what is the formula for the new K?
    Knew = 1/kold
  13. How many different types of stress have an impact on K?
    Three
  14. What are the different types of stresses & impacts on K?
    • 1) Adding/Removing reactants or products
    • 2)Change in Pressure/Volume (only gases)
    • 3)Change in Temperature (adding/subtracting temp)
  15. When adding Pressure, what happens to the volume?
    It decreases
  16. When adding volume, what happens to the pressure?
    It decreases
  17. When volume is added, which direction does the reaction point to?
    In direction of most moles
  18. When pressure is added, which direction does the reaction point to?
    In direction of less moles
  19. When adding temperature to an endothermic reaction, which way does the reaction shift?
    Endothermic: acts as reactant (+ value) Shifts to the right
  20. When adding temperature to an exothermic reaction, which way does the reaction shift?
    Exothermic: acts as products (- value) Shifts to the left
  21. How can you tell if a reaction is exothermic?
    It has a negative value, or acts as the products
  22. How can you tell if a reaction is endothermic?
    It has a positive value, or acts as the reactants

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