1. How To Name Chemical Formulas
Supplemental to Chapter 20

2. Binary Compounds
Binary Compounds are ionic bonds between one metal (+) and one nonmetal (-).
When you name binary ionic compounds, you always mention the cation (+ ion) first (usually the metal).
When you name the second ion (the – anion), you will change the ending to “ide”

3. Common Binary Anions Oxygen oxide Phosphorus phosphide
Nitrogen nitride
Sulfur sulfide
Chlorine chloride

4. Name These Binary Compounds
RbCl =
NaF =
CuO =
AlN=
K2S =
NaCl =

5. Name These Binary Compounds
RbCl = Rubidium Chloride
NaF = Sodium Fluoride
CuO = Copper Oxide
AlN= Aluminum Nitride
K2S = Potassium Sulfide
NaCl = Sodium Chloride

6. Polyatomic Ions
Polyatomic ions are a group of ions (2+ elements) that are covalently bonded together.
You would say the first element as is.
You would then say the rest of the bonded polyatomic ions after the first element, using their specific endings.

7. Polyatomic Ion Endings
Ammonium NH4
Acetate C2H3O2
Chlorate CIO3
Hydroxide OH
Nitrate NO3
Carbonate CO3
Sulfite SO3
Sulfate SO4
Phosphate PO4
Peroxide O2

8. Naming Polyatomic Ions
HSO4 -
NaNO3 -
Ba(OH)2 -
KNO3 -
CaCO3 -
CuSO3 –
CaSO4 –
HO2 -
(notice the different endings of the last two polyatomic ions.)

9. Naming Polyatomic Ions
HSO4 - Hydrogen Sulfate
NaNO3 - Sodium Nitrate
Ba(OH)2 - Barium hydroxide
KNO3 - potassium nitrate
CaCO3 - calcium carbonate
CuSO3 – copper sulfite
CaSO4 – calcium sulfate
HO2 – hydrogen peroxide

10. Prefixes for Covalent Compounds
The prefixes indicate how many atoms of each element are in a binary covalent compound. These occur when 2 nonmetals covalently bond.

11. Prefixes for Covalent Compounds
Mono = 1
Di = 2
Tri = 3
Tetra = 4
Penta = 5
Hexa = 6
Hepta = 7
Octa = 8

12. How to Say Covalent Compounds
P2O5 - this is named diphosphorus pentoxide, because there are two phosphorus atoms and five oxygen atoms.   CO - this is carbon monoxide (you need the "mono-" because there's only one oxygen atom). CF4 - this is carbon tetrafluoride,