Dipoles

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Nicholas Kull_3L
Posts: 30
Joined: Fri Sep 28, 2018 12:23 am

Dipoles

Postby Nicholas Kull_3L » Fri Nov 16, 2018 9:31 am

Can someone explain the dipole moments, induced dipole moments, and how they relate?

LedaKnowles2E
Posts: 62
Joined: Fri Sep 28, 2018 12:27 am

Re: Dipoles

Postby LedaKnowles2E » Fri Nov 16, 2018 10:23 am

Dipole moments happen when one atom in a molecule is more polar than another, like H2O. Electrons are pulled toward O, the more electronegative atom. This gives the end of the molecule with O a slightly negative charge compared to the H ends.

Dipole-dipole attractions: this is when 2 polar molecules (like H2O) are attracted to each other because each molecule has a positive end and a negative end, so the positive end of one molecule is attracted to the negative end of the other.

Dipole-induced dipole: this is when you have a polar molecule and a neutral molecule. When they get close enough together, the negative end of the polar molecule repels the electrons in the neutral molecule, causing the neutral molecule to have a positive end and a negative end, called an induced dipole. At that point, the negative end of the polar molecule is attracted to the positive end of the previously neutral molecule.

Megan_Ervin_1F
Posts: 78
Joined: Fri Sep 28, 2018 12:18 am

Re: Dipoles

Postby Megan_Ervin_1F » Sun Nov 18, 2018 7:41 pm

I was wondering, does every molecule have a dipole moment?

Anita Wong 1H
Posts: 68
Joined: Fri Sep 28, 2018 12:27 am
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Re: Dipoles

Postby Anita Wong 1H » Sun Nov 18, 2018 7:44 pm

in a non-polar molecule, the whole molecule has zero dipole moment but bonds are polar. When two non-polar molecules comes closer to each other, the negative part (electrons) of one molecule attract the positive part (nucleus) of another molecule. As a result, two dipoles are induced.


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