Cambridge IGCSE Chemistry
3.1Formulae
Formulae in Cambridge IGCSE Chemistry: what the syllabus expects you to know, the learning objectives and how to practise.
Subtopic42 practice questions2 lessons
Learning objectives
What the syllabus expects you to be able to do.
- 3.1.1State the formulae of the elements and compounds named in the syllabus.
- 3.1.2Define the molecular formula of a compound as the number and type of each atom in one molecule.
- 3.1.3Deduce the formula of a simple compound from the numbers of each type of atom shown in a model or diagram.
- 3.1.4Write word equations and symbol equations, including state symbols, to show how reactants form products.
- 3.1.5Supplement: define the empirical formula of a compound as the simplest whole-number ratio of the different atoms or ions in it.
- 3.1.6Supplement: deduce the formula of an ionic compound from a model or diagram of its ions, or from the charges on the ions.
- 3.1.7Supplement: write symbol equations with state symbols, including ionic equations.
- 3.1.8Supplement: deduce the symbol equation, with state symbols, for a reaction from information given.
Lessons
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Chemical formulae: writing and naming compounds
30 min
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Word, symbol and ionic equations
30 min
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Sample question
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