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International Edexcel AS chemistry

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  1. Topic 4: introductory organic chemistry
    The fundamentals
    2 Topics
  2. Functional groups and homologous series
    2 Topics
  3. Nomenclature
    2 Topics
  4. Structural isomerism
    2 Topics
  5. Types of reaction
    2 Topics
  6. Substitution reactions
    2 Topics
  7. Hazards, risks and risk assessments
  8. Alkanes from crude oil
    1 Topic
  9. Alkanes as fuels
    1 Topic
  10. Haloganoalkanes
    1 Topic
International Edexcel AS chemistry The fundamentals Alkanes
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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