IMFs

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  • Created by: ftpptf
  • Created on: 02-03-16 18:22
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  • IMFs
    • London Forces
      • Electrons in atom/  structure temporarily shift to one side of structure.
        • This generates temporary dipole even in non-polar molecule.
          • This temporary dipole induces dipole in neighbouring molecule.
            • Two temporary dipoles attract towards each other.
              • This is a temporary process but is constantly stopping and starting.
      • Strength depends on:
        • No. of electrons
        • Mr of molecule
    • Permanent dipole-dipole
      • Some molecules have permanent dipoles.
        • These dipoles attract towards each other.
          • Stronger because not temporary.
    • Hydrogen Bonding
      • NOT a bond!!
        • Strongest IMF
          • Happens when a molecule has a COVALENT BOND of a HYDROGEN to a FLUORINE, OXYGEN  or NITROGEN.
            • Bond of H to F/O/N is very polar.
            • Lone pair of neighbouring F/O/N then attracted to very ?+ H.

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