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    Ho can you tell the difference to which compounds have permanent dipole-dipole interactions and to which have instantaneous dipole-dipole interactions (van deer Waals forces)??
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    Is it made up of more than one element? if not them VdW

    Is the molecule symmetrical? (octahedral, tetrahedral, trigonal planar or linear - in each the dipoles cancel out) then VdW

    If not, PDD.
 
 
 
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