dipole moments and polarization

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Alysia Garcia 1B
Posts: 40
Joined: Wed Feb 21, 2018 3:02 am

dipole moments and polarization

Postby Alysia Garcia 1B » Sun May 27, 2018 10:15 pm

Would a molecule be polar if the dipole moments don’t cancel each other out? like why is water polar if there’s both a negative charge (on the oxygen) and positive charge (on the hydrogen atoms)?

Tarek Abushamma
Posts: 30
Joined: Fri Apr 06, 2018 11:01 am

Re: dipole moments and polarization

Postby Tarek Abushamma » Sun May 27, 2018 10:19 pm

In water the dipole moments are not linearly opposing each other, which is why they do not cancel each other out. For this reason the molecule is polar.

Chris Fults 1C
Posts: 27
Joined: Wed Nov 15, 2017 3:01 am

Re: dipole moments and polarization

Postby Chris Fults 1C » Sun May 27, 2018 10:24 pm

Do you mean it is polar because the oxygen is pulling electrons giving it a slight negative charge and the two hydrogens have a slight positive charge? Why doesn't this apply to CH4 which is to my knowledge non-polar?

AshleyLamba1H
Posts: 30
Joined: Fri Apr 06, 2018 11:03 am

Re: dipole moments and polarization

Postby AshleyLamba1H » Sun May 27, 2018 10:55 pm

Water has the VSEPR type AX4, which is tetrahedral. However, two of these ends are lone pairs, which leaves the two hydrogens connected to oxygen in a bent shape. This is why water is a polar molecule. CH4 on the other hand is non polar; although its shape is also tetrahedral, the central atom has no lone pairs. The symmetry of the tetrahedron allows the four dipoles to cancel.


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