Before we start talking about Chapter 8, we must first review the meaning of chemical formulas from Chapter 7:
1. The formulas of chemical compounds tell the elements present in a compound
Example: CH4 the formula for methane, contains the elements C and H2. The formulas of chemical compounds tell the relative number of atoms of each element
Example: CH4 shows that for every 1 atom of C there are 4 atoms of H3. The formulas of chemical compounds tell the number of atoms of each element present in 1 molecule of the substance.
Example: In CH4, each molecule of methane is composed of 1 molecule of C and 4 molecules of H