Dipole moments

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Dipole moments

Postby Kellylin_4D » Mon Nov 18, 2019 12:33 am

Are there always dipole moments in a molecule? How do we know when they cancel out and become nonpolar, esp if the shape also affects whether it’s nonpolar or not?

Rida Ismail 2E
Posts: 139
Joined: Sat Sep 07, 2019 12:16 am

Re: Dipole moments

Postby Rida Ismail 2E » Mon Nov 18, 2019 12:50 am

There do not always have to be dipole moments. Like in the Molecule H2 there are no dipoles because theoretically the electrons are perfectly shared because the electronegaticities are exactly the same. If there are dipole moments then they would cancel out if they are pulling equally in opposite directions therefore the net dipole would be 0

Ryan Juncker 3D
Posts: 51
Joined: Wed Sep 18, 2019 12:18 am

Re: Dipole moments

Postby Ryan Juncker 3D » Mon Nov 18, 2019 12:53 am

Molecules do not always have dipoles. A dipole moment only occurs in polar bonds or if an instantaneous dipole induces an instantaneous dipole in another atom. You can tell if a molecule is polar first by determining if its bonds are polar and then looking at whether or not they cancel out because of the shape. Only equal and opposite dipole moments cancel out completely.

Return to “Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)”

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