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3.1 Formulae

Syllabus
0620–2026–2027
Topic
3.1
Level
—

3.1.1—Formulae of the elements and compounds

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

3.1.2—Molecular formula of a compound as the

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

3.1.3—Deduce the formula of a simple

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

3.1.4—Construct word equations and symbol

  • Construct word equations and symbol equations to show how reactants form products, including state symbols

3.1.5—Empirical formula of a compound as the

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

3.1.6—Deduce the formula of an ionic

  • 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

3.1.7—Construct symbol equations with state

  • Construct symbol equations with state symbols, including ionic equations

3.1.8—Deduce the symbol equation with state

  • Deduce the symbol equation with state symbols for a chemical reaction, given relevant information

Objective notes

8 learning objectives
ConceptIGCSE Chemistry