Polar/nonpolar [ENDORSED]

$sp, sp^{2}, sp^{3}, dsp^{3}, d^{2}sp^{3}$

JulissaLopez1F
Posts: 12
Joined: Wed Sep 21, 2016 2:57 pm

Polar/nonpolar

can someone review the difference between polar and nonpolar molecules?

Kathrin Magdalani 3J
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Joined: Fri Jun 17, 2016 11:28 am

Re: Polar/nonpolar

Bonds that are partially ionic are polar. Nonpolar bonds have an equal sharing of electrons.

Akshay_Manjarekar_3C
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Joined: Wed Sep 21, 2016 2:58 pm

Re: Polar/nonpolar

Another way to look at it is if the molecule as a whole has a dipole moment. A molecule is polar if one side is more negative than the other and it is attracted to the opposite charged side of another molecule.

Wenqian_Deng_1L
Posts: 23
Joined: Wed Sep 21, 2016 3:00 pm

Re: Polar/nonpolar

So does that mean we have to draw the Lewis structure of the molecule to see if it has a dipole moment?

emilie liu 3G
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Joined: Fri Jul 22, 2016 3:00 am

Re: Polar/nonpolar

Yes, it helps to draw the Lewis structure to see whether the molecule is polar. This can be done by observing the dipole movements and seeing if they cancel out in a symmetrical molecule.

Dang Lam
Posts: 55
Joined: Thu Jul 27, 2017 3:01 am

Re: Polar/nonpolar

It has to do with electronegative. A nonpolar bond is a bond arises when the electronegativities of two atom are the same, aka the dipole moment = 0, or they cancels each other out. Polar bond is the opposite of that

Michelle Steinberg2J
Posts: 73
Joined: Fri Sep 29, 2017 7:04 am

Re: Polar/nonpolar

Last year I learned something helpful that has stuck with me!

"SNAP"
Symmetrical
Nonpolar
Asymmetrical
Polar

This says that Symmetrical molecules (determined when you draw the Lewis Structure) are NON polar. Asymmetrical molecules are Polar. Generally this rule holds true.

Susie Lee 2I
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Joined: Fri Sep 29, 2017 7:05 am

Re: Polar/nonpolar

In lecture, Prof. Lavelle discussed that a non-polar molecule must have zero electric dipole movement which is possible if it contains nonpolar bonds, or polar bonds with dipoles that cancel.

Nicole Jacobs 1C
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Joined: Thu Jul 13, 2017 3:00 am

Re: Polar/nonpolar

can you always use the trick that Lavelle was saying where if water would want to bond on different locations of the molecule, then the molecule is polar for every compound?

Tia Tomescu 2D
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Joined: Fri Sep 29, 2017 7:06 am

Re: Polar/nonpolar

Nicole, yes, that is true for polar molecules.

Daniel Rivas 3L
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Joined: Fri Sep 29, 2017 7:07 am

Re: Polar/nonpolar

Yeah basically of there is an unequal sharing of electrons, it it polar. If there isn't, it is nonpolar.

Jasmin Tran 1J
Posts: 54
Joined: Thu Jul 27, 2017 3:00 am

Re: Polar/nonpolar

Also, an example of a polar molecule would be water, H2O. The O is slightly more negative than the H, giving it a bent shape. An example of a nonpolar molecule would be carbon dioxide, CO2. It is a straight molecule with the C forming double bonds in the middle, so the charges are equally distributed.

Phillip Winters 2F
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Joined: Fri Sep 29, 2017 7:05 am

Re: Polar/nonpolar

Also, nonpolar molecules are symmetrical while polar molecules are not symmetrical

Yizhou Liu 3L
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Joined: Fri Sep 29, 2017 7:07 am

Re: Polar/nonpolar

A polar molecule forms when an atom of high electronegativity bonds with a less electronegative atom. Conversely, the electrons of a non-polar molecule are distributed more equally.