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AQA AS Chemistry- how do i know if a molecule has dipole- dipole attractions? Watch

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    How do i know if a molecule has dipole-dipole attractions and are Van der Waals forces stronger or weaker than duple-dipole attractions?
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    (Original post by will_5054)
    How do i know if a molecule has dipole-dipole attractions and are Van der Waals forces stronger or weaker than duple-dipole attractions?
    It depends on whether atoms have varying electronegativity in the molecule. E.g Br-Br cannot form a dipole because the electronegativity in both atoms is the same. H-Br can though because bromine is more electronegative. H becomes delta positive, Br becomes delta negative - it forms and instantaneous dipole. The molecule can attract others, causing them to become delta negative and positive this forming a dipole-dipole interaction
    I hope that kinda helps? :/
 
 
 
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