This document contains a final exam review covering various chemistry concepts including: - The number of hydrogen and oxygen atoms in 12 molecules of water. - The seven SI base units including the mole, kilogram, and second. - Information about isotopes including that they have different numbers of neutrons. - Electron configurations and gas law calculations. - The chemical formula for calcium chloride is CaCl2. - Carbon dioxide is a molecule. - How to add numbers using significant figures. - Formula units and molecules such as NaCl and O2. - Conversions between units like mm and cm.