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International Edexcel AS chemistry
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Topic 4: introductory organic chemistryThe fundamentals2 Topics

Functional groups and homologous series2 Topics

Nomenclature2 Topics

Structural isomerism2 Topics

Types of reaction2 Topics

Substitution reactions2 Topics

Hazards, risks and risk assessments

Alkanes from crude oil1 Topic

Alkanes as fuels1 Topic
Lesson 1, Topic 1
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Alkanes
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The alkanes are hydrocarbons
Saturated hydrocarbons: they only contain single bonds
General formula: C_{n}H_{2n+2}
 The molecular formula of eicosane is C_{20}H_{42}
Number of carbons, n = 20, so there are 20 carbons
Number of hydrogens, n = 20, so (2×20) + 2 = 42, so there are 42 hydrogen atoms
Cyclohexanes have a ring stucture