Dipole Moment Significance

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Erik Buetow 1F
Posts: 96
Joined: Fri Aug 30, 2019 12:15 am

Dipole Moment Significance

Postby Erik Buetow 1F » Sun Nov 03, 2019 1:07 pm

First, what does a dipole moment actually indicate? Second, do all bonds have a dipole moment or only specific ones?

Prasanna Padmanabham 4I
Posts: 111
Joined: Thu Jul 25, 2019 12:17 am

Re: Dipole Moment Significance

Postby Prasanna Padmanabham 4I » Sun Nov 03, 2019 2:57 pm

Dipole moment exists for any covalently bonded molecules where the atoms have different electronegativities. This is because one atom will exert a stronger force on the electrons and "hog" the electrons from the less electronegative atom. Therefore, the dipole moment exists when there is a difference between electronegativities.

The closer the electronegativities are, the less of a dipole moment exists. For example, there would be no dipole movement between two Oxygen atoms in an O2 molecule, but a dipole moment exists for H2O because Oxygen is more electronegative than Hydrogen.

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