Compound Names and Formulas
Unit Goals:
*Periodic Law
Recall all you know about elements using their
location on the Periodic Table
*Define and use oxidation numbers
*Understand the quantitative significance of a chemical formula
Return to the mole and molar mass
New application: Percentage Composition
Percentage by mass of each element in a compound
*Given a chemical formula you will be able to
classify the compound
write the compound name
*Given a compound by name you will be able to
classify the compound
write the compound formula
---------------------------------------------------------------------------------------------------------------For this unit there are 9 polyatomic ions that you must memorize
You must know the name, formula and oxidation number (charge) for each polyatomic ion
Table 7-2 in your text book has a list of polyatomic ions. If you are planning on taking
the SAT II in chemistry you should know them all.
Name
Ammonium
Formula
NH4
Charge
+1
Phosphate
PO4
-3
Carbonate
CO3
-2
Sulfate
SO4
-2
Acetate
C2H3O2
CH3COO
-1
Hydroxide
OH
-1
Nitrate
NO3
-1
Permanganate
MnO4
-1
Cyanide
CN
-1