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 displayed formula

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

  • C3H8
  • a simplified organic formula, with H atoms removed from the alkyl chains, leaving just a C skeleton and associated functional groups
  • the number of atoms in an element in a molecule
  • the simplest whole-number ratio of atoms of each element present in a compound

3. Define curly arrows

  • to show the movement of an electron pair in only the breaking down of a covalent bond
  • show the movement of an electron pair in the breaking down or formation of a new covalent bond
  • used in equations to show the products once the reaction has taken place
  • to show the movement of a single electron in the breaking down of or formation of a covalent bond

4. Define empirical formula

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

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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