Study your notes! Quiz Ch.8
•
1.
2.
3.
•
4.
5.
Write the formula and name the
following:
Ca + Se 
Sr + Br 
Al + P 
Write the formula from the name:
Chromium(III)oxide
Cesium iodide
Naming Ternary Ionic
Compounds
Na + NO3  NaNO3
Sodium nitrate
How? (use the handout!)
Polyatomic Ions
(many atom ions)
• Polyatomic ions are covalently bonded atoms
with a collective charge.
• EX:
H
..
N H + H+  H
H+
N H
H
NH4+ is the ammonium ion ( +1 charge)
Review the List of Polyatomic Ions
Treat a Polyatomic ion as a Single ion;
don’t break it up !!
 You know some of these ions by name.

Nitrates (NO3-)
Nitrites (NO2-)
Phosphates ( PO4-3)
Writing Formulas w/Polyatomics
Li + CO3-2  Li2CO3
 Mg + PO4-3  Mg3(PO4)2
 NH4 + Cl  NH4Cl
NAMES!!
Lithium carbonate
Magnesium phosphate
Ammonium chloride

The Rules for Ternaries
(very easy!!)
 Write the correct formula
 Write the name of the Cation first
 Write the full name for the Anion second
 That’s it !!
Al + SO4-2 
Al+3 + SO4-2
Al2(SO4)3 * use parens ( ) if you need more than 1 ion!
Aluminum sulfate
You have 5 min to review notes
from last class.
 Write the formulas for :
1. Ca + N
2. Al + SO3
-2 
3. Mg + phosphate 
Write the names for the above.
Write the formula for:
1. Magnesium carbonate 2. Nickel(II)sulfate
Naming Covalent Compounds
( really easy)
 CO2
CO
carbon
carbon
dioxide
monoxide
P2O4
diphosphorous
tetraoxide
SO3
sulfur
trioxide
 Covalent Compounds consist of two non-metals!!
 There are no charges to balance because no
electrons are lost or gained.
 So, how do you get the ratios?
 Know the prefixes
Prefixes: only for Covalent Cmpds.
Non-metal, Non-metal combinations
 Mono
 Di
 Tri
 Tetra
 Penta
1
2
3
4
5
 Hexa
 Hepta
 Octa
 Nona
 Deca
6
7
8
9
10
Try These !!
Name the following:
 PO4
 NO2
 NO3
 N2O3
 P2O5
 SiO2
Write the formula:
 Sulfur trioxide
 Boron dioxide
 Dinitrogen
pentoxide
 Carbon monoxide
 Carbon
tetrachloride
Handout !!