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International Edexcel AS chemistry
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Topic 4: introductory organic chemistryThe fundamentals2 Topics
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Functional groups and homologous series2 Topics
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Nomenclature2 Topics
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Structural isomerism2 Topics
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Types of reaction2 Topics
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Substitution reactions2 Topics
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Hazards, risks and risk assessments
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Alkanes from crude oil1 Topic
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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: CnH2n+2


- The molecular formula of eicosane is C20H42
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

