Review:
­ chemistry/matter
­ WHMIS
­ WHMIS symbols
­ MSDS sheets
Sep 7­7:49 AM
Naming Molecular Compounds
­ in order to name molecular compounds there are a number of definitions and steps you are required to learn
(a) IUPAC: International Union for Pure and Applied Chemistry (they are the world authority on chemistry)
Sep 7­7:51 AM
1
(b) Molecule:
Contains two or more elements
Ex. Water (H2O)
(c) Molecular Element: A molecule where all the atoms are the same
Ex. Oxygen (O2)
Sep 7­7:56 AM
(c) Molecular Compounds: Contain non­metals only
Ex. Water: (H2O)
Carbon Dioxide (CO2)
(d) Ionic Compounds: Contain a metal and a non­
metal
Ex.
Potassium Chloride (KCl)
Sep 7­9:45 AM
2
(e) Molecular Formula: Chemical formula which donates the number and type of different atoms in a molecule
(f) Empirical Formula: Simplest chemical formula that can be written for a compound (smallest whole number ratio of atoms)
Example:
Empirical Formula HO
Molecular Formula H2O2
Empirical Formula CO2
Molecular Formula C2O4
Sep 7­9:50 AM
Prefixes used to name Molecular Compounds
1:
2:
3:
4:
5:
6:
7:
8:
9:
10:
mono
di
tri
tetra
penta
hexa
hepta
octa
nona
deca
Sep 7­10:04 AM
3
Steps to Naming Molecular Compounds
1. Write the name of the first element
2. Write the name of the second element with ide
ending
3. Use prefixes to indicate the atoms in each element
4. Erase the prefix mono if it in on the first name
Sep 7­10:06 AM
Ex. 1: Write the IUPAC name for the following:
(a) CCl4
(b) P3S6
Sep 7­10:09 AM
4
Ex.2: Write the chemical formula for each of the following.
(a) Nitrogen trichloride
(b) Triphosphorus pentabromide
Sep 7­10:10 AM
Trivial Name to Remember
O3
Ozone
H2O
Water
H2O2
Peroxide
CH4
Methane
NH3
Ammonia
C12H22O11 Sucrose
Sep 7­10:11 AM
5
Activity:
Complete worksheet provided
Readings:
Pgs: 201­204
Sep 7­10:13 AM
6