Polar or Nonpolar

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

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905174774
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Polar or Nonpolar

Postby 905174774 » Sat Dec 07, 2019 12:01 pm

Does the VSEPR shape having anything to do with a molecule being polar or nonpolar?

Jade Hinds 2B
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Joined: Tue Sep 10, 2019 12:16 am

Re: Polar or Nonpolar

Postby Jade Hinds 2B » Sat Dec 07, 2019 12:08 pm

if the charge distribution of the shape is symmetrical it is nonpolar
if the charge distribution of the shape is asymmetrical it is polar

Sophia Shaka 3L
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Re: Polar or Nonpolar

Postby Sophia Shaka 3L » Sat Dec 07, 2019 12:11 pm

Correct me if I'm wrong, but I believe square planar is the only VSEPR shape where the molecule may contain lone pairs and still be nonpolar (if every X in AX4E2 is the same element). In any other shape, lone pairs will indicate the net dipole does not cancel and therefore the molecule is polar. Many of the VSEPR shapes with no lone pairs are able to be nonpolar, such as linear, trigonal planar, and tetrahedral with the same elements bonded to the central atom.

Annie Ye
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Re: Polar or Nonpolar

Postby Annie Ye » Sun Dec 08, 2019 6:04 pm

Yes because the shape can determine if the dipole moments cancel out.

Carly_Lipschitz_3L
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Re: Polar or Nonpolar

Postby Carly_Lipschitz_3L » Sun Oct 25, 2020 3:21 pm

When you use VSEPR, the molecule will either be symmetrical or asymmetrical surrounding the central atom. You can tell if the molecule is polar or not based on if it is symmetrical. Symmetrical = non-polar, asymmetrical = polar.

Sydney Jensen 3L
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Re: Polar or Nonpolar

Postby Sydney Jensen 3L » Sun Oct 25, 2020 10:12 pm

The central atom has much to do with the VESPR model of molecules, and the different shapes can determine the different polarities based on the symmetry pf the central atoms and their charge distribution. For example, the molecule is nonpolar if it is symmetrical, and if the shape is asymmetrical if it is polar.

Jiapeng Han 3A
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Re: Polar or Nonpolar

Postby Jiapeng Han 3A » Fri Nov 13, 2020 11:06 pm

Typically, symmetrical molecule is non-polar while asymmetrical molecule is polar because the dipoles can't cancel out.

Eric Cruz 3L
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Re: Polar or Nonpolar

Postby Eric Cruz 3L » Sat Nov 21, 2020 12:33 am

For the most part, yes, vsepr shapes are a good indicator of whether or not a molecule is polar or not. For example any VSEPR shape that has no lone pair of electrons (linear, trigonal planar, tetrahedral, trigonal bipyramidal, and octahedral) its structure is set up for it to be very symmetrical and for the dipole moments to cancel out. However, for VSPER shapes that include lone paired electrons, its structure does not allow the molecule to be nonpolar.

Kiyoka Kim 2I
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Re: Polar or Nonpolar

Postby Kiyoka Kim 2I » Sat Nov 21, 2020 3:18 am

After determining the shape, a molecule will be polar if the dipole moments are not equal and are not opposite of each other.

Adam Bustamante 3J
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Re: Polar or Nonpolar

Postby Adam Bustamante 3J » Sat Nov 21, 2020 6:08 pm

If the molecule's shape is symmetrical, it is polar whereas if the molecule is asymmetrical, it'll be non polar.

emmaferry2E
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Re: Polar or Nonpolar

Postby emmaferry2E » Sat Nov 21, 2020 6:15 pm

Yes, if the VSEPR model indicates that the molecule's dipole moments cancel out, then it will be a nonpolar molecule ( and same vice versa). This can be shown clearly through cis-1,2-dichloroethene and trans-1,2-dichloroethene. These molecules have the same molecular formula, but the organization of the atoms bonds is different so that only the trans-1,2-dichloroethene molecule cancels out the net dipole moments within the molecule.

Jerry_T
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Re: Polar or Nonpolar

Postby Jerry_T » Sat Nov 21, 2020 11:24 pm

Are there other factors that affect polarity besides symmetry?

805593945
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Re: Polar or Nonpolar

Postby 805593945 » Sat Nov 21, 2020 11:27 pm

Whether the bond is actually polar. If the shape is asymmetrical but the bond isn't polar, then the molecule isn't polar.

Shruti Kulkarni 3G
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Re: Polar or Nonpolar

Postby Shruti Kulkarni 3G » Sat Nov 21, 2020 11:33 pm

Hi! If the shape is symmetric with the same atoms on each side, it won't be polar. If the same is asymmetric at all or has different atoms at different points, the bond will be polar.


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