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 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
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2. Define a radical

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

3. Define electrophile

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

4. Define empirical formula

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

5. 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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