Chem 122 16-17

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studysuccess
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303438
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Chem 122 16-17
Updated:
2015-06-01 16:46:00
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Chem 122 16 17
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Chem 122 16-17
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Chem 122 16-17
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  1. Keq is the?
    The formula:
    3H2 + N2⇌2NH3
    It is written?
    • equilibrium constant
  2. The equilibrium constant shows
    • -the if there is more reactant than product at equilibrium.
    • -the extent to which the forward and reverse reaction take place.
  3. How is Ionization constant symbolized?
    Kw, Ka, etc.
  4. Set up the solution for this problem:

    At 25oC, a 0.100 M solution of HC2H3O2
    is 1.34% ionized and has an [H+]
    of 1.34 x 10-3 mol/L.  Calculate Ka for acetic acid.

    HC2H3O2⇌H+C2H3O2
    • HC2H3O2=.1-.00134=0.099mol/L reactant
    •  HC2H3O2 yields 1 mole of both, so equal moles of each=1.34 x 10-3 mol/L, HC2H3O2
    • =1.8X10^-5
  5. Ionic Equilibria problems measure...
    the pH from the ionization constant Ka
  6. what's the solubility product constant
    Ksp
  7. 5 steps for writing the Sparingly soluble solids
    • Ksp:
    • 1) ionize the salt
    • 2) write the Ksp expression
    • 3) determine the moles of the ions
    • 4) substitute into the Ksp expression
    • 5) Ksp has no denominator
  8. The solubility of AgCl in water is 1.3 x 10^-5 mol/L. 
    AgCl(s)⇌Ag+(aq) + Cl-(aq) 
    Set up this solution
    [Ag]=[Cl]=is 1.3 x 10^-5, so

    (1.3 x 10^-5 )(1.3 x 10^-5 )=1.7X10^-10
  9. Write the Ksp expression for PbSO4
    Then, substitute x.
    • PbSO4⇌Pb^2+SO4^-2
    • Expression Ksp=[Pb+2][SO4-2]
    • Substitute x: Ksp=[X][X]
  10. What is hydrolysis?
    term used for general reactions which a water molecule is split
  11. how do you buffer a solution?

    what do I need to know about them?
    • -a weak acid mixes with it's conjugate base form a buffer solution
    • -they resist pH changes with small dilutions
  12. the oxidation number represents
    # of e- lost, gained, & unequally shared.

    -Lost/gained=metal & non-metal. (ionic bond)

    -unequally shared=2 mor more non-metals. (covalent)
  13. what does a positive & negative oxidation # mean?
    • +=fewer electrons
    • -=more electrons
  14. All elements in their free state (Na, Cu, Mg, H2, O2, Cl2, N2) have an oxidization number of
    zero.
  15. H is +1, except in ______, where it is___ (eg NaH, CaH)
    metal hydrides, -1
  16. O s -2, except in ____, where it is ___, and OF2, where it is ___
    peroxides, -1, +2.
  17. The metallic elements in ionic compounds has a ____ oxidation number
    positive
  18. In covalent compounds, the ____ oxidation number is assigned to the most ____
    negative, electronegative
  19. The algebraic sum of the oxidation numbers of the elements in a compound is
    0
  20. The algebraic sum of the oxidation number of the elements in a polyatomic ion is ____ the charge of the ion
    equal to
  21. Determine the oxidation number for manganese on potassium permanganate (polyatomic ion)?
    KMnO4
    • K=+1(1)=1
    • O=-2(4)=-8
    • 1+-8+X=0, so Mn=7

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