A diatomic molecule is a molecule that exists as two bonded atoms of the same elements. Some examples include hydrogen, nitrogen, oxygen, fluorine, chlorine, bromine, and iodine. When molecules of gasoline burn in an automobile engine, the carbon and hydrogen atoms react with oxygen in the air to form carbon monoxide, carbon dioxide, and water vapor. This is all exhaust, and separate in the atmosphere. The law of conservation of matter states that in a chemical reaction, matter is neither created nor destroyed. This is why all chemical equations must have an equal number of atoms on both the reactant and product side. This is called a balanced chemical equation. A coefficient indicates the relative number of units of each substance involved in the chemical reaction.
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