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Cambridge IGCSE chemistry

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Lesson 11 of 19
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Formulas of compounds

Learning objectives:

  • State the formulae of the elements and compounds named in the subject content¬†

  • Define the molecular formula of a compound as the number and type of different atoms in one molecule¬†

  • Deduce the formula of a simple compound from the relative numbers of atoms present in a model or a diagrammatic representation

  • Define the empirical formula of a compound as the simplest whole number ratio of the different atoms or ions in a compound¬†

  • Deduce the formula of an ionic compound from the relative numbers of the ions present in a model or a diagrammatic representation or from the charges on the ions