1. Unit 1: Chemistry Basics
1.3 Review Molecules:
Naming and Formulas

2. Binary Molecular Compounds
Compounds between two nonmetals
First element in the formula is named first.
Keeps its element name
Gets a prefix if there is a subscript on it
Second element is named second
Use the root of the element name plus the -ide suffix
Always use a prefix on the second element

3. List of Prefixes 1 = mon(o) 2 = di 3 = tri 4 = tetra 5 = penta
6 = hexa
7 = hepta
8 = octa
9 = nona
10 = deca
List of Prefixes

4. Naming Binary Compounds
diphosphorus pentoxide
CO2 =
carbon dioxide
CO =
carbon monoxide
N2O =
dinitrogen monoxide

5. Practice – Write the Formula
Compound Name
Compound Formula
Carbon dioxide
Carbon monoxide
Diphosphorus pentoxide
Dinitrogen monoxide
Silicon dioxide
Carbon tetrabromide
Sulfur dioxide
Phosphorus pentabromide
Iodine trichloride
Nitrogen triiodide
Dinitrogen trioxide
Check next slide for answers

6. Practice – Name the Compounds
Compound Formula
Compound Name
N2O4
SO3 NO
NO2
As2O5
PCl3
CCl4
H2O
SeF6
Check next slide for answers

7. Hydrocarbons 1 = methyl 2 = ethyl 3 = prop 4 = but 5 = penta 6 = hexa
7 = hepta
8 = octa
9 = nona
10 = deka
If all single bonds- ends in “ane”
If at least one double bond- ends in “ene”
If at least one triple bond- ends in “yne”