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Nomenclature writing chemical formulas naming

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					            Chapter 7

      Nomenclature
    writing chemical formulas
  naming chemical compounds
potassium chromate   potassium dichromate




                                            1
        Sodium and Chlorine
                               1A 2A                                                     8A


    Na Cl                                                               3A 4A 5A 6A 7A


                               1+                                                   1-
      +    -
                                       1B 2B 3B 4B 5B 6B 7B 8B 9B 10B

    Na Cl
      NaCl
Sodium Chloride
•   Cation 1st: name of element
•   Anion 2nd: root and add -ide
•   When combined together
     ✓ Metals lose e- (+ ion = cation)

     ✓ Nonmetals gain e- (- ion = anion)

     ✓ Ionic Compounds (Type I Binary Ionic)                                              2
         Magnesium and Fluorine
     Mg        F
                       1A 2A                                                  8A
                                                             3A 4A 5A 6A 7A
                                                                         1-
                         2+ 1B 2B 3B 4B 5B 6B 7B 8B 9B 10B

          2+       -
     Mg        F

       MgF2
•   The number of electrons lost must equal the
    number of electrons gained
•   The total + and - charge must add to 0
    Magnesium Fluoride                                                         3
           Aluminum and Oxygen
      Al       O        1A 2A                                               8A
                                                           3A 4A 5A 6A 7A
                                                                    2-
          3+       2-
     Al        O           + 1B 2B 3B 4B 5B 6B 7B 8B 9B 10B 3+




       Al2O3
    Aluminum Oxide
•   The number of electrons lost must equal the
    number of electrons gained
•   Overall charge = 0                                                      4
Write the chemical formula for
strontium sulfide

SrS
•   You might have criss-crossed to Sr2S2
    but then you must reduce it to the
    lowest whole number ratio.
•   remember always write ionic formula in
    lowest whole number ratio
                                             5
Write the chemical formula for
potassium nitride

K 3N
    +1    -3
•   K N




                                 6
                    The Periodic Table

1A   2A                                                                               8A

                                                             3A   4A   5A   6A   7A

                                                                       N    O    F
Na Mg     1B   2B   3B   4B   5B   6B   7B   8B   9B   10B   Al        P    S    Cl

K    Ca




                                                                                           7
Write the chemical formula for
gallium oxide
      +3   -2
•   Ga O
      Ga2O3




                                 8
Write the chemical formula for
potassium sulfide
     +1   -2
•   K S
      K 2S




                                 9
Write the chemical name for
CaBr2
Remember:
                        st
• the metal (cation is 1 )
• the nonmetal (anion is 2nd : root and -ide)




Calcium Bromide

                                                10
Chemical formula for copper
fluoride               1A 2A
                                                                3A 4A 5A 6A 7A
                                                                                 8A




Oxidation states for           1B 2B 3B 4B 5B 6B 7B 8B 9B 10B

                                                          2+
     Copper:                                           1+ 2+
     1+: Cu(I)
    2+: Cu(II)
         -
Know F
• The number of electrons lost =                Roman Numerals refresh
                                                1: I
the number of electrons gained                  2: II
• Overall charge = 0                            3: III
                                                4: IV
• so use Cu+ or Cu(I)                           5: V
• CuF                                           6: VI
                                                7: VII               11
Chemical formula for copper(II)
fluoride              1A 2A
                                                               3A 4A 5A 6A 7A
                                                                                8A



                  -
Copper:       F               1B 2B 3B 4B 5B 6B 7B 8B 9B 10B

1+: Cu(I)                                                2+
                                                      1+ 2+
2+: Cu(II)


CuF2
 Roman numeral tells you the
 charge on copper
             2+
 Cu(II) = Cu
                                                                                 12
Write the chemical formula for zinc
chloride
                     1A 2A                                                     8A
                                                              3A 4A 5A 6A 7A


                             1B 2B 3B 4B 5B 6B 7B 8B 9B 10B

                                                        2+
                                                     1+ 2+




ZnCl2
•   Remember that zinc is one of the
    transition metals that does not require a
    Roman #, since it’s oxidation state is
    always +2.
                                                                               13
Write the chemical formula for
chromium (VI) sulfide
•   The Roman # tells you the +6 charge on
    the chromium metal
      +6 -2
•   Cr S
•   You might have criss-crossed to Cr2S6
    but then you must reduce it to the
    lowest whole number ratio.
•   CrS3
                                         14
Write the name for Fe2O3


•   you can un-criss-cross
•   or you can determine the charge on iron
    by working from the charge on the
    anion
•   iron(III) oxide


                                          15
Write the name for Ag2S
                    1A 2A                                                     8A

                                                             3A 4A 5A 6A 7A



•No need for a              1B 2B 3B 4B 5B 6B 7B 8B 9B 10B


 Roman # since                                         2+
                                                    1+ 2+
 silver is always
+1
(memorize along
  with Zn and Cd)
Silver sulfide

                                                                              16
Write the name for Cu2O
• You can “un-criss-cross”
• or you can work into the cation by
  knowing that the anion is -2
     ✓   The total + and - charge must add to 0
     ✓   this means that electrons lost = electrons gained
     ✓   the Roman # = the individual oxidation state of one of
         the metal ions (not the total metal charge)

•   Copper (I) oxide


                                                                  17
Write the name for CrP2

•   you can’t just un-criss-cross because
    this is a formula which has been
    reduced.
     ✓ work off the non-metal’s charge
     ✓ remember the total + must equal - that

       means the e- lost = e- gained
chromium (VI) phosphide
                                                18
Roadmap for Naming Binary Compounds




                                      19

				
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