(2.2) MOLECULAR COMPOUNDS (p130-131)
Naming and formula writing
Molecular Compounds
 Molecular compounds are formed by combining ________________________________.
 They do so by ____________________ electrons.
 The bond formed by sharing electrons is called a _________________________bond.
Properties of Molecular Compounds
 Often soft, _____________________________________________________.
 If they dissolve in water, they form solutions that ______________________ conduct
electricity.
 Tend to have relatively low ________________________________________.
Naming Molecular Compounds
 Naming molecular compounds is different than naming ionic compounds
because ______________________ can ________________________ in many different ways.
 e.g. carbon and oxygen can combine 2 different ways!!!
 carbon monoxide
CO
 carbon dioxide
CO2
 To name a molecular compound
are used to show the
_________________________ of each type of atom.
Prefix system
Prefix
Number
mono
1
di
2
tri
3
tetra
4
penta
5
hexa
6
hepta
7
octa
8
nona
9
deca
10
Examples
name
formula
sulfur trioxide
dihydrogen
monosulfide
SiO2
CF4
N2O5
disulfur dinitride
NOTE: never have 2 vowels in a row between the prefix and element 
ex: 2 “o’s” in monooxide (use monoxide instead)
Naming Molecular Compounds
 A molecular compound has a __________________________ name:
first name
second name
Common Molecular Compounds
You must know these common names ….
 H2O
______________________
 H2O2
___________________________________
 CH4
______________________