Edexcel GCSE Chemistry · 1CH0
Specification 8.6 · Paper 2
Revise: Homologous SeriesA general formula describes the pattern followed by every member of a series. It is not the formula of one particular molecule.
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GCSE Chemistry · key term
An algebraic formula that represents every member of a homologous series using a variable such as for the number of carbon atoms.
Used by Edexcel and OCR
Specification 8.6 · Paper 2
Revise: Homologous SeriesA general formula describes the pattern followed by every member of a series. It is not the formula of one particular molecule.
Specification C2.3b · Paper 1 (Foundation), Paper 3 (Higher)
A formula that represents every member of a homologous series using a variable such as .
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
A formula that describes the composition shared by members of a homologous series, using n for a variable number of carbon atoms.
Do not say that members have the same molecular formula. They have the same general formula, but their molecular formulae differ.
When identifying a homologous series from formulae, compare consecutive members: they should differ by as well as following the same general formula.
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