chem exam 3

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lacythecoolest
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140714
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chem exam 3
Updated:
2012-03-09 15:26:21
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chem exam
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chem exam 3
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  1. one step reaction
    uncatalyized
  2. If K is >1
    theres more products present
  3. If K <1
    theres more reactants present
  4. Is equilibrium concentration effected by temperature?
    yes
  5. Can a solid be a product of equilibrium?
    no
  6. How do you find equilibrium if an insoluble or slightly soluble material is placed in water?
    the rate of dissolution of ions from the solid = the rate of precipitation of ions from the sturated solution
  7. What is salt solubility dependent on?
    • temperature
    • chemical reagents
  8. What indicates the concentration of ions in solution will be quite low?
    a small K
  9. What rules can be useful for making qualitative predictions about whether or not two ions will form a precipitate?
    Solubility rules
  10. a mixture of a weak acid with its conjugate base
    pH buffer
  11. an aqueous solution that resists the large pH changes observed whenever a strong acid or base is added to water
    pH buffer
  12. buffered mistures resist large pH changes bcause
    the weak acid component neutralizes strong bases while the weak base component neutralizes strong acids
  13. an acid that yields two H+ ions per acid molecule upon ionization
    diprotic acid
  14. In order for equilibrium to occur neither reactants nor products can
    escape from the system
  15. this law expresses, for any rxn, the relationship btwn the concentrations of the reactants and products present at equilibrium
    law of mass action
  16. numerator of the equilibrium-constant expression is the
    • product of the concentrations of all substances on the product side
    • then raised to the power of their coeffiecent
  17. Le Chatelier's principle
    • If a system at equilibrium is disturbed by a change in:
    • * temperature
    • * pressure
    • * concentration
    • then the system will shift its equilbrium postition so as to counteract the effect of the disturbance

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