Ionic Compounds Names and Formulas by linzhengnd

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									 Ionic Compounds:
Names and Formulas
       SNC2D
              Counting Ions
Sodium chloride or NaCl
  contains 1 sodium ion and 1 chloride ion.




               (Lewis dot diagrams)
              Counting Ions
However, different ions may form compounds in
 different ratios.

For example, calcium chloride or CaCl2
  contains 1 calcium ion and 2 chloride ions.

(Subscripts are added to the symbols in a formula
  if there is more than one of that type of atom.)
         Counting Ions: Practice
FeCl3
Na2O
CaO
Fe2O3
NaClO3
Na2CO3
Ca(ClO3)2
         Counting Ions: Practice
FeCl3 contains   1 iron ion and 3 chloride ions
Na2O
CaO
Fe2O3
NaClO3
Na2CO3
Ca(ClO3)2
         Counting Ions: Practice
FeCl3 contains   1 iron ion and 3 chloride ions
Na2O contains    2 sodium ions and 1 oxide ion
CaO
Fe2O3
NaClO3
Na2CO3
Ca(ClO3)2
         Counting Ions: Practice
FeCl3 contains   1 iron ion and 3 chloride ions
Na2O contains    2 sodium ions and 1 oxide ion
CaO contains     1 calcium ion and 1 oxide ion
Fe2O3
NaClO3
Na2CO3
Ca(ClO3)2
         Counting Ions: Practice
FeCl3 contains   1 iron ion and 3 chloride ions
Na2O contains    2 sodium ions and 1 oxide ion
CaO contains     1 calcium ion and 1 oxide ion
Fe2O3 contains   2 iron ions and 3 oxide ions
NaClO3
Na2CO3
Ca(ClO3)2
         Counting Ions: Practice
FeCl3 contains    1 iron ion and 3 chloride ions
Na2O contains     2 sodium ions and 1 oxide ion
CaO contains      1 calcium ion and 1 oxide ion
Fe2O3 contains    2 iron ions and 3 oxide ions
NaClO3 contains   1 sodium ion and 1 chlorate ion
Na2CO3
Ca(ClO3)2
        Counting Ions: Practice
FeCl3 contains    1 iron ion and 3 chloride ions
Na2O contains     2 sodium ions and 1 oxide ion
CaO contains      1 calcium ion and 1 oxide ion
Fe2O3 contains    2 iron ions and 3 oxide ions
NaClO3 contains   1 sodium ion and 1 chlorate ion
Na2CO3 contains   2 sodium ions and 1 carbonate ion
Ca(ClO3)2
        Counting Ions: Practice
FeCl3 contains     1 iron ion and 3 chloride ions
Na2O contains      2 sodium ions and 1 oxide ion
CaO contains       1 calcium ion and 1 oxide ion
Fe2O3 contains     2 iron ions and 3 oxide ions
NaClO3 contains    1 sodium ion and 1 chlorate ion
Na2CO3 contains    2 sodium ions and 1 carbonate ion
Ca(ClO3)2 contains 1 calcium ion and 2 chlorate ions
           Why These Ratios?
It is the valence electrons that determine how
   these ions combine.
For example, calcium had 2 valence electrons to
   lose and each chlorine only wants 1. So calcium
   has to find 2 chlorines.
              Ratio Practice
Use diagrams to determine how the following
 combine to form compounds:
     Mg2+ and Br1-
     Li1+ and P3-
     Ca2+ and O2-
     Al3+ and OH1-
     K1+ and SO42-
              Ratio Practice
Use diagrams to determine how the following
 combine to form compounds:
     Mg2+ and Br1-         MgBr2
     Li1+ and P3-
     Ca2+ and O2-
     Al3+ and OH1-
     K1+ and SO42-
              Ratio Practice
Use diagrams to determine how the following
 combine to form compounds:
     Mg2+ and Br1-         MgBr2
     Li1+ and P3-          Li3P
     Ca2+ and O2-
     Al3+ and OH1-
     K1+ and SO42-
              Ratio Practice
Use diagrams to determine how the following
 combine to form compounds:
     Mg2+ and Br1-         MgBr2
     Li1+ and P3-          Li3P
     Ca2+ and O2-          CaO
     Al3+ and OH1-
     K1+ and SO42-
              Ratio Practice
Use diagrams to determine how the following
 combine to form compounds:
     Mg2+ and Br1-         MgBr2
     Li1+ and P3-          Li3P
     Ca2+ and O2-          CaO
     Al3+ and OH1-         Al(OH)3
     K1+ and SO42-
              Ratio Practice
Use diagrams to determine how the following
 combine to form compounds:
     Mg2+ and Br1-         MgBr2
     Li1+ and P3-          Li3P
     Ca2+ and O2-          CaO
     Al3+ and OH1-         Al(OH)3
     K1+ and SO42-         K2SO4
              Ratio Practice
Use diagrams to determine how the following
 combine to form compounds:
     Al3+ and O2-          Al2O3

Notice that the quick method of determining the
 formula is to criss-cross the valences:
                Criss-cross
But the ratio between the ions must be reduced to
 lowest terms (and 1s are not written).

E.g. Pb4+ and O2- becomes

           ?          not     Pb2O4
                  Criss-cross
But the ratio between the ions must be reduced to
 lowest terms (and 1s are not written).

E.g. Pb4+ and O2- becomes

           PbO2        not      Pb2O4

              Please complete “More Formula Practice.”
     Ionic Compounds: Names
The name of an ionic compound is simply the
 name of the positive ion followed by the name
 of the negative ion, e.g.:

  NaCl
  CaCl2
  Li2O
     Ionic Compounds: Names
The name of an ionic compound is simply the
 name of the positive ion followed by the name
 of the negative ion, e.g.:

  NaCl    is    sodium chloride
  CaCl2
  Li2O
     Ionic Compounds: Names
The name of an ionic compound is simply the
 name of the positive ion followed by the name
 of the negative ion, e.g.:

  NaCl    is    sodium chloride
  CaCl2   is    calcium chloride
  Li2O
     Ionic Compounds: Names
The name of an ionic compound is simply the
 name of the positive ion followed by the name
 of the negative ion, e.g.:

  NaCl    is    sodium chloride
  CaCl2   is    calcium chloride
  Li2O    is    lithium oxide
     Ionic Compounds: Names
The name of an ionic compound is simply the
 name of the positive ion followed by the name
 of the negative ion, e.g.:

  KOH
  Mg(ClO3)2
  NH4F
     Ionic Compounds: Names
The name of an ionic compound is simply the
 name of the positive ion followed by the name
 of the negative ion, e.g.:

  KOH           is   potassium hydroxide
  Mg(ClO3)2
  NH4F
     Ionic Compounds: Names
The name of an ionic compound is simply the
 name of the positive ion followed by the name
 of the negative ion, e.g.:

  KOH           is   potassium hydroxide
  Mg(ClO3)2     is   magnesium chlorate
  NH4F
     Ionic Compounds: Names
The name of an ionic compound is simply the
 name of the positive ion followed by the name
 of the negative ion, e.g.:

  KOH           is   potassium hydroxide
  Mg(ClO3)2     is   magnesium chlorate
  NH4F          is   ammonium fluoride
   Names with Multivalent Ions
The only tricky ones to name are those that contain
 multivalent ions. It is necessary to look at how
 the ions have combined to figure out the valence
 of the multivalent ion.

  FeO      must be

  Fe2O3    must be
   Names with Multivalent Ions
The only tricky ones to name are those that contain
 multivalent ions. It is necessary to look at how
 the ions have combined to figure out the valence
 of the multivalent ion.

  FeO      must be iron (II) oxide
           (because oxide is O2-)
  Fe2O3    must be
   Names with Multivalent Ions
The only tricky ones to name are those that contain
 multivalent ions. It is necessary to look at how
 the ions have combined to figure out the valence
 of the multivalent ion.

  FeO      must be iron (II) oxide
           (because oxide is O2- and the ratio is 1:1)
  Fe2O3    must be iron (III) oxide
   Names with Multivalent Ions
Try it with copper:

  CuCl2

  CuSO4

  Cu2O
   Names with Multivalent Ions
Try it with copper:

  CuCl2    copper (II) chloride

  CuSO4

  Cu2O
   Names with Multivalent Ions
Try it with copper:

  CuCl2    copper (II) chloride

  CuSO4 copper (II) sulphate

  Cu2O
   Names with Multivalent Ions
Try it with copper:

  CuCl2    copper (II) chloride

  CuSO4 copper (II) sulphate

  Cu2O     copper (I) oxide
              More Practice
Please complete the
  “More Practice”
  handout and
  textbook questions
  p. 171 #6-8.

								
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