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Science glossary film: Formulae

Formulae

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A chemical formula is a way of writing the composition of a compound.

A chemical formula is a way of writing the composition of a compound. Compounds always consist of atoms combined in a specific, fixed ratio. For example, NaCl is the chemical formula for sodium chloride, which always contains one sodium atom for every one chlorine atom. H2O is the chemical formula for water – each water molecule contains two hydrogen atoms combined with one oxygen atom.

Compounds always consist of atoms combined in a specific, fixed ratio. For example, NaCl is the chemical formula for sodium chloride, which always contains one sodium atom for every one chlorine atom. H2O is the chemical formula for water – each water molecule contains two hydrogen atoms combined with one oxygen atom.

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