Chemical Formulae

Summary: Chemical Formulae show the relative numbers of each atom in a compound. Tags: concepts chemistry formulae science y7 school Created: 2026-04-22 05:00:31Z Last Updated: 2026-04-22 05:00:31Z

Content

A chemical formula uses Chemical Symbols and subscripts to represent atom ratios in compounds. If no subscript is shown, the count is one atom.

Examples from the source:

• H2O means 2 hydrogen atoms and 1 oxygen atom.
• CO2 means 1 carbon atom and 2 oxygen atoms.
• H2SO4 means 2 hydrogen atoms, 1 sulfur atom, and 4 oxygen atoms.

Formulae provide a language-independent way for scientists to communicate composition consistently.

Related Notes

• Chemical Symbols
• Compounds
• Molecules
• Elements