Naming Molecular (Covalent) Compounds
Number
Prefix
1
mono
2
di-
3
tri
4
tetra
5
penta
6
hexa
7
hepta
8
octa
9
nona
10
deca
These are needed because
Nitrogen and Oxygen can
combine in a number of
different ways.
•
•
•
•
•
N20
NO
NO2
N2O4
N2O5
Naming Molecular (Covalent) Compounds
Number
Prefix
1
mono
2
di-
3
tri
4
tetra
5
penta
6
hexa
7
hepta
8
octa
9
nona
10
deca
1. First word is the name of
the element appearing
first in a chemical
formula, including a
prefix indicating how
many atoms of that
element are present if
more than one.
2. Second word ends in ide
and also has a prefix
indicating the number of
atoms present.
Nitrogen and Oxygen
•
•
•
•
•
N20 = Dinitrogen monoxide
NO =Nitrogen Monoxide
NO2 Nitrogen Dioxide
N2O4 Dinitrogen Tetraoxide
N2O5 Dinitrogen Pentaoxide
Naming Molecular (Covalent) Compounds
Number
Prefix
1
mono
2
di-
3
tri
4
tetra
5
penta
6
hexa
7
hepta
8
octa
9
nona
10
deca
•
•
•
•
•
•
•
•
•
•
•
•
CO =
S02 =
NO3 =
CF5 =
CO2 =
NO2 =
Nitrogen Monoxide =
Dinitrogen trioxide =
Carbon Tetrafluoride =
Dinitrogen pentoxide =
Silicon TetraChloride =
Disilicon Hexachloride =
Naming Molecular (Covalent) Compounds
Number
Prefix
1
mono
2
di-
3
tri
4
tetra
5
penta
6
hexa
7
hepta
8
octa
9
nona
10
deca
•
•
•
•
•
•
•
•
•
•
•
•
CO =Carbon Monoxide
S02 = Sulfur Dioxide
NO3 = Nitrogen trioxide
CF5 =Carbon Pentafluoride
CO2 = Carbon Dioxide
NO2 = Nitrogen Dioxide
NO = Nitrogen Monoxide
N2O3 =Dinitrogen trioxide
CF4 =Carbon Tetrafluoride
N2O5=Dinitrogen pentoxide
SiCl4 = Silicon TetraChloride
Si2Cl6 = Disilicon Hexachloride
Which of the following compounds is
named INCORRECTLY?
a)
b)
c)
d)
CS2, carbon disulfide
BCl3, boron trichloride
IF7, iodine heptafluoride
PCl5, phosphorus hexachloride
Which of the following molecular compounds is
named INCORRECTLY?
a)
b)
c)
d)
SbCl3, antimony trichloride
C2O5, dicarbon pentoxide
CF4, carbon tetrafluoride
H3As, hydrogen arsenide