Names and Chemical Formulas of Ionic Compounds

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Names and Chemical Formulas of Ionic Compounds

• 3.2
• All about ionic compounds !

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Review of ionic compounds

• They are between metals and non-metals
• They are between metals and polyatomic ions!
• They gain and lose electrons ( a transfer)
• Ex calcium bromide
• Today we will learn how to write the names and
  formulas of ionic compounds ?

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Rules for writing names of ionic compounds
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• Rules
• The (metal) positive ion is always the first part
  of the name and its name does NOT change.
• Calcium? Calcium
• The (non-metal) negative ion is always the second
  part of the name and its name changes.
• The non-metal s name changes to the
  suffix/ending ide
• Bromine ? Bromide
• If the non-metal is a polyatomic ion, then write
  its original name with no changes at all
• e.g. Ca(NO3)2 calcium nitrate

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• Practice naming NON-METAL IONS
• Take off the original ending and add an ide
  ending.
• Element Name Ion Name
• Florine (F) ?
•   Sulphur (S) ?
• Write the names of the following ions
• a) Br- __________________________
• b) Cl- __________________________
• c) I- __________________________
• d) O-2 __________________________
• e) N-3 __________________________

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Write the names for the following ionic
compounds

• NaCl
  LiNO3
• CaBr2
  Ba3(PO4)2
• MgO
• KOH

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Rules continued

• How to write the CHEMICAL FORMULA for the ionic
  compound????
• We need to use the charges/combining capacity for
  each ion when we do this.
• So how does it work?

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How to write chemical formulas of ionic compounds

• Aluminum Chloride
• Potassium Nitride

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How to write chemical formulas of ionic compounds

• Sodium phosphate
• Magnesium oxide

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How to write chemical formulas of ionic compounds

• Iron(III) oxide

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NAMING MONATOMIC METAL IONS

• If a metal has more than one possible charge, the
  charge has to be indicated by a Roman numeral, in
  parenthesis, immediately following the name.
• Ex Fe3
• Fe2
• Roman numerals are
• I 1 V 5
  IX 9
• II 2 VI 6 X
  10
• III 3 VII 7
• IV 4 VIII 8

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P. 86
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P. 87
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Back to multivalent metals

• What is the name for
• Fe2O3 MnO
  Hg3N2

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p. 89
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p. 90
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Practice naming with polyatomic ions

• Potassium chromate

• CaSO4

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p. 91
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Homework

• Homework is to finish all the questions given in
  this set of notes.
• You should be feeling a little Y Zr (wiser)
  after this lecture.
• Credit to Alexander the great
  and his gang