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Polar v. Nonpolar

Posted: Sun Jul 21, 2019 4:01 pm
by MedhaVallurupalli1F
How do you figure out if a molecule is polar/nonpolar and how do dipoles relate to this?

Re: Polar v. Nonpolar

Posted: Sun Jul 21, 2019 5:23 pm
by Yilun Ding
First, a polar molecule must contain polar bonds. Then, if all polar bonds can cancel out it can be a nonpolar molecules, if cannot, it will become a polar molecule. To figure out whether all the dipoles can cancel out completely, you can use a vector diagram to see it clearly.

Re: Polar v. Nonpolar

Posted: Sun Jul 21, 2019 7:03 pm
by Yasmin Olvera 1D
Do dipoles influence if an atom has polar or nonpolar bonds?

Re: Polar v. Nonpolar

Posted: Sun Jul 21, 2019 8:08 pm
by Sisi Li 1F
Dipole moments occur wherever there is an unequal sharing of electrons, which makes the compound polar. If you look at the elements and see that they have different electronegativities, then electrons will be unequally shared. The element with the greater electronegativity will pull electrons towards it, creating the unequal sharing

Re: Polar v. Nonpolar

Posted: Tue Jul 30, 2019 11:01 pm
by Bella Martin
is CH4 a nonpolar molecule because the vectors of the bonds cancel out? What about CH3+?

Re: Polar v. Nonpolar

Posted: Tue Jul 30, 2019 11:09 pm
by Chris Charton 1F
Yes, the vectors would cancel out with that shape, but more importantly C-H is not a polar covalent bond, they both have similar Electronegativities. CH3+ would also be a symmetrical shape with canceling vectors, but again, the bonds are not polar.

Re: Polar v. Nonpolar

Posted: Sat Nov 02, 2019 10:12 am
by Kaitlyn Jang 1F
A polar molecule has polar bonds, meaning the electrons in a covalent bond is unequally shared due to one of the atoms being more strongly electronegative than the other. An example of this would be H2O, where oxygen is more electronegative than hydrogen. The unequal sharing creates dipoles, and oxygen has a partial negative charge while hydrogen has a partial positive charge. Nonpolar molecules have nonpolar covalent bonds, meaning the electrons are shared equally between atoms and do not create partial charges. For example, Cl2 is nonpolar because the electrons are being shared equally between the two atoms.

Re: Polar v. Nonpolar

Posted: Thu Nov 07, 2019 10:52 pm
by Ruth Glauber 3L
Try drawing out a lewis structure and comparing formal charges for each atom.

Re: Polar v. Nonpolar

Posted: Fri Nov 08, 2019 6:15 am
by Pipiena Malafu 3J
To determine whether the dipoles are polar or not, you're also going to need the shape of the molecule. To double check, you could find an electronegativity chart and check to see if the difference between values surpass the nonpolar covalent point.

Re: Polar v. Nonpolar

Posted: Fri Nov 08, 2019 9:03 am
by Amir Bayat
A trick for finding nonpolar bonds are diatomic molecules. Since the electronegativity difference is zero between two of the same atom, the bonds are nonpolar and the electrons are equally shared between the two atoms.

Re: Polar v. Nonpolar

Posted: Sat Nov 09, 2019 12:18 am
by CynthiaLy3H
A molecule is polar when there is an unequal sharing of electrons between two atoms that arise due to differences in electronegativity. A molecule is nonpolar if electrons are shared equally, resulting in no dipole moment.

Re: Polar v. Nonpolar

Posted: Sun Nov 10, 2019 4:34 pm
by BCaballero_3A
If electrons are shared equally, it is nonpolar. If electrons are shared unequally, it is polar, which you should be able to see once you calculate formal charge.