1. Naming Molecular Compounds
Text book p. 152

2. Naming MOLECULAR
Many have common names such as water (H20), ammonia (NH3).
The common name doesn’t help us determine what it is made of.
ALL molecular compounds, (except those containing Hydrogen), have the same rules.

3. NAMING RULES… First element – normal name Second element – ends in ide
When more than one atom present, a prefix is used which tells us the number of atoms
EXCEPTION to rule 3. If the first element only has one atom, the prefix MONO is NOT used.

4. Prefix + second element (with ide ending)
Number of atoms
Prefix 1
mono 6
hexa 2 di 7
hepta 3
tri 8
octa 4
tetra 9
nona 5
penta 10
deca
Prefix + First element
Prefix + second element (with ide ending)

5. Examples CO2 N2O CCl4 phosphorus pentaflouride dinitrogen trioxide
carbon dioxide
N2O
dinitrogen monoxide
CCl4
carbon tetrachloride
phosphorus pentaflouride
PF5
dinitrogen trioxide
N2O3
Dinitrogen monoxide
N2O

6. Assignment Page 153 Page 154 Assess your Learning Question 6
Questions 4, 6, 8, 10