Polar/non-polar

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Emily Vainberg 1D
Posts: 102
Joined: Sat Jul 20, 2019 12:15 am

Polar/non-polar

Postby Emily Vainberg 1D » Sat Nov 16, 2019 1:14 pm

How do you determine if a molecular is polar or non polar?

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

Re: Polar/non-polar

Postby Ethan Lam 4A » Sat Nov 16, 2019 1:15 pm

A molecule is polar if it has dipole movement. It is nonpolar if no dipole movement.

lilymayek_1E
Posts: 107
Joined: Sat Aug 17, 2019 12:16 am

Re: Polar/non-polar

Postby lilymayek_1E » Sat Nov 16, 2019 1:23 pm

a lot of how a molecule is polar or not can be determined by the symmetry of the molecule. if a dipole is present in an individual bond but has an identical counterpart opposite to that bond, the dipoles will cancel and the molecule will be nonpolar. if dipoles do not cancel due to symmetry, the molecule will be polar. a molecule can also be polar if not all dipole moments cancel; a good example of this is CCl4 (nonpolar), but if instead CHCl3, not all the dipole moments cancel and is thus nonpolar. 2E.3 in the textbook (and the diagram 2E.7) explains this really well!

RobertXu_2J
Posts: 104
Joined: Fri Aug 30, 2019 12:17 am

Re: Polar/non-polar

Postby RobertXu_2J » Sat Nov 16, 2019 1:25 pm

You look at the bonds and symmetry. If the bonds are covalent with no dipole moments, then it is non-polar. If they are polar bonds but there is symmetry it is also non-polar. Only if both of these are false then can it be polar.


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