Lone pairs

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Hannah_1G
Posts: 100
Joined: Wed Sep 18, 2019 12:22 am

Lone pairs

Postby Hannah_1G » Fri Dec 06, 2019 12:05 am

How do you figure out if lone pairs align to create a dipole moment?

Maggie Eberhardt - 2H
Posts: 97
Joined: Sat Jul 20, 2019 12:16 am

Re: Lone pairs

Postby Maggie Eberhardt - 2H » Sat Dec 07, 2019 1:06 am

usually, lone pairs will create some sort of dipole moment because lone pairs cause greater electron repulsion, resulting in uneven charges in the molecule. But if you're unsure, I'd draw the Lewis Structure to see exactly how the lone pairs line up

Ethan Lam 4A
Posts: 69
Joined: Thu Jul 11, 2019 12:17 am

Re: Lone pairs

Postby Ethan Lam 4A » Sat Dec 07, 2019 1:10 am

If the lone pairs are on opposite sides then they cancel out. An example of this would be XeF4 since it is square planar and all the dipole movements from the Fs and electron pairs are negated.

Nikki Razal 1L
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Joined: Fri Aug 30, 2019 12:17 am
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Re: Lone pairs

Postby Nikki Razal 1L » Sat Dec 07, 2019 1:10 am

^^ to add on to that, dipole moments are created by lone pairs if the lone pairs don't cancel each other out, and one factor that can influence whether or not they cancel out is by looking at the bond angles

Rohan Kubba Dis 4B
Posts: 50
Joined: Sat Aug 17, 2019 12:18 am

Re: Lone pairs

Postby Rohan Kubba Dis 4B » Sat Dec 07, 2019 1:11 am

Yeah, mostly what I have seen shows that molecules with dipoles are usually polar, however, XeF4, which has lone pairs is actually non polar. So I would just recognize that usually it is heavily dependent on shape and structure. But more on your question, usually if there’s a lone pair, there’s probably a dipole.

Hannah_1G
Posts: 100
Joined: Wed Sep 18, 2019 12:22 am

Re: Lone pairs

Postby Hannah_1G » Sat Dec 07, 2019 2:31 pm

Ethan Lam 4A wrote:If the lone pairs are on opposite sides then they cancel out. An example of this would be XeF4 since it is square planar and all the dipole movements from the Fs and electron pairs are negated.

So you need to know the molecular shape before figuring out if the lone pairs align to create a dipole moment?


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