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 electrophile

  • when a molecule is removed from a saturated molecule to make an unsaturated molecule
  • an atom that is attracted to an electron-rich atom, where it accepts a pair of electrons to form a new covalent bond
  • a species with an unpaired electron
  • an atom that is attracted to an electron-deficient atom, where it donates a pair of electrons to form a new covalent bond
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2. Define displayed formula

  • a formula showing the relative positioning of all the atoms in a molecule and the bonds between them
  • the simplest algebraic formula of a member of a homologous series
  • C2H4
  • the simplest whole-number ratio of atoms of each element

3. Define homolytic fission

  • the breaking of a covalent bond with one of the bonded elections going to each atom to form 2 radicals
  • the breaking of a covalent bond with both of the bonded electrons going to one of the atoms forming a cation (+ve) and an anion (-ve)
  • a species with an unpaired electron
  • C2H4

4. Define molecular formula

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

5. 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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