1. Aim: Explain the different types of Chemical Formulas
Notes 7-1

2. 1.) Chemical Formulas : Have two purposes
a.) to indicate the composition
b.) to indicate the number of atoms

3. 2.) Monatomic Elements
a.) appear as one element
b.) noble gases

4. 3.) Diatomic elements
a.) molecule with two atoms attached
b.) examples include BrINClHOF
c.) Br2, etc.

5. 4.) Compounds
a.) subscripts: how many atoms of an element
b.) CO2
1.) one C atom, and two O atoms
c.) Ca3(PO4)2
1.) three Ca, two P, and eight O atoms
2.) subscript outside a parenthesis multiplies by all atoms inside parenthesis

6. 5.) Types of Formulas:
a.) empirical – simplest whole number ratio
1.) H2O, or CH3
b.) molecular – number of atoms in one molecule
1.) H2O2, C4H10, or H2O
2.) Some molecular formulas can be empirical like H2O

7. c.) structural formula
1.) shows the way in which atoms are bonded in a molecule