CIE AS Chemistry (9701) 2019-2021

Revision Notes

3.1.1 Formulae, Functional Groups & the Naming of Organic Compounds

Formulae of Functional Groups

  • The general formula is a formula that represents a homologous series of compounds using letters and numbers
  • For example, the general formula of alkanes is CnH2n+2
  • This means that in an alkane with 3 carbon atoms (n = 3) there are 8 hydrogen atoms (2 x 3 + 2)
    • A homologous series is a group of organic compounds that have the same functional group, the same general formula, and the same chemical properties
  • The structural formula is a formula that shows how the atoms are bonded to each carbon atom in a molecule
  • The displayed formula is a 2D representation of an organic molecule showing all its atoms (by their symbols) and their bonds (by single, double, or triple bonds)
  • The skeletal formula is a simplified displayed formula with all the carbon and hydrogen (C-H) bonds removed

An Introduction to AS Level Organic Chemistry Formulae of Organic Compounds Part 1, downloadable AS & A Level Chemistry revision notes An Introduction to AS Level Organic Chemistry Formulae of Organic Compounds Part 2, downloadable AS & A Level Chemistry revision notes An Introduction to AS Level Organic Chemistry Formulae of Organic Compounds Part 3, downloadable AS & A Level Chemistry revision notes An Introduction to AS Level Organic Chemistry Formulae of Organic Compounds Part 4, downloadable AS & A Level Chemistry revision notes

 

 

Author: Francesca

Fran has taught A level Chemistry in the UK for over 10 years. As head of science, she used her passion for education to drive improvement for staff and students, supporting them to achieve their full potential. Fran has also co-written science textbooks and worked as an examiner for UK exam boards.
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