Cancelling out dipole moments

(Polar molecules, Non-polar molecules, etc.)

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Alicia Yu 1A
Posts: 30
Joined: Thu Feb 22, 2018 3:02 am

Cancelling out dipole moments

Postby Alicia Yu 1A » Tue May 29, 2018 9:47 am

When drawing a VSEPR structure and determining if the molecule is polar or nonpolar, how do you know when dipole moments cancel?

nelquosey
Posts: 31
Joined: Fri Apr 06, 2018 11:02 am

Re: Cancelling out dipole moments

Postby nelquosey » Tue May 29, 2018 10:43 am

I would draw the direction of the arrows, if you look like they are positioned in obvious opposite directions, they cancel out. If it is not obvious I would draw vector diagrams like in high school physics, determine the x and y components and figure out whether or not the directions cancel the magnitudes out.

kendallbottrell
Posts: 31
Joined: Fri Apr 06, 2018 11:02 am

Re: Cancelling out dipole moments

Postby kendallbottrell » Tue May 29, 2018 10:47 am

If they are opposite of each other (180˚) then they cancel. If they are anything less than 180˚, they do not cancel.

Salena Chowdri 1I
Posts: 66
Joined: Fri Apr 06, 2018 11:02 am

Re: Cancelling out dipole moments

Postby Salena Chowdri 1I » Wed May 30, 2018 3:29 pm

Once you draw out the compound, the biggest thing that will help you are the dipole arrows in relation to the elements involved. If you have an asymmetrical structure that's one sign but when deciding if something is polar or nonpolar check if the arrows of 2 identical bonds cancel out (are exactly opposite to each other).


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