Polar vs Non Polar

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

Reese - Dis 1G
Posts: 31
Joined: Fri Sep 28, 2018 12:15 am

Polar vs Non Polar

How can you tell if a molecule is polar or non polar?

Diviya Khullar 1G
Posts: 59
Joined: Fri Sep 28, 2018 12:19 am

Re: Polar vs Non Polar

You can determine if a molecule is polar or non-polar by looking at its symmetry. If there are dipole moments that are across from each other and cancel each other out, the molecule is non-polar. Or, if there is equal sharing of electrons between the atoms of the molecule, the molecule is polar. If, however, the dipole moments don't cancel out then the molecule is polar. In a water molecule, for example, there are two dipole moments one on each of the O--H bonds, but since the molecule is a bent shape, the dipole moments don't cancel out and the molecule is polar.

Rebecca Park
Posts: 30
Joined: Fri Sep 28, 2018 12:17 am

Re: Polar vs Non Polar

You will either get the electronegativity and if the difference is greater than 0.4, then it will be polar.
If you aren't given the electronegativities, then you have to find it by looking at the shape of the lewis structure

705192887
Posts: 77
Joined: Fri Sep 28, 2018 12:18 am

Re: Polar vs Non Polar

Polarity of a molecule depends on whether or not the molecule is symmetrical in regards to its partial charges and sharing of electrons. If the molecule is symmetrical and has no dipole moments, or the dipole moments on opposite sides cancel out (like in water) the molecule is non-polar. However, if the molecule is asymmetrical and dipole on one side, then the molecule is polar.