Definitions of Key Terms: OCR AS Chemistry Unit 2 (F322)

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  • Created by: katherine
  • Created on: 11-04-14 15:09

1. Define homologous series

  • compounds with the same structural formula but different arrangement of atoms in space
  • a series of organic compounds with the same functional group, but with each successive member differing by CH2
  • molecules with the same molecular formula but with different structural arrangements of atoms
  • the part of the organic molecule responsible for its chemical reactions
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2. Define structural isomer

  • a special type of E/Z isomerism
  • a species with an unpaired electron
  • molecules with the same molecular formula but with different structural arrangements of atoms
  • compounds with the same structural formula but with different arrangements of atoms in space

3. Define a radical

  • the part of an organic molecule responsible for its chemical reactions
  • the breaking of a covalent bond with one of the bonded electrons going to each atom, forming two radicals
  • a species with and unpaired electron
  • an atom that's attracted to an electron-rich atom, where it accepts a pair of electrons to form a new covalent bond

4. Define molecular formula

  • the number of atoms of each element in a molecule
  • the simplest whole-number ratio of atoms of each element present in a compound
  • CH3CH2CH2CH3
  • a formula shown the carbon skeleton an associated functional groups only

5. Define structural formula

  • the simplest whole-number ratio of atoms of each element present in a compound
  • a formula showing the minimal amount of detail for the arrangement of atoms in a molecule
  • the simplest algebraic formula of a member of a homologous series
  • C3H8

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