Intermolecular bonds

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  • Created by: Emily
  • Created on: 19-04-14 09:15
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  • intermolecular forces
    • van der waals
      • caused by instantaneous dipoles
        • as a result of the changing position of the electron cloud
        • the more electrons, the larger the instantaneous dipole and so the stronger the vdw's
      • act between all atoms and molecules
      • Act between all atoms and molecules
      • explains...
        • BP of Noble Gases increases with atomic number
        • BP of Hydrocarbons increase with increased chain length
    • Dipole - Dipole
      • attraction between molecules with permanent dipoles
        • two permanent dipoles will attract eachother
          • And so will align themselves
          • Not all molecules have a dipole moment - not all are polar
    • Hydrogen Bonding
      • only with a very electronegative atom with a lone pair
        • Fluorine
        • Oxygen
        • Nitrogen
      • explains...
        • H20/HCl BP is a lot higher than anything in its group
          • As it has a Hydrogen Bond
            • Energy required to turn from liquid - gas = much higher
              • have to overcome stronger H-bonds


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