## Dipole Moments and Polar Molecules

Meigan Wu 2E
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Joined: Fri Sep 28, 2018 12:29 am
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### Dipole Moments and Polar Molecules

How do you calculate for the dipole moment of a molecule and use it to determine whether a molecule is polar or nonpolar?

Andrew Sun 1I
Posts: 30
Joined: Fri Sep 28, 2018 12:18 am

### Re: Dipole Moments and Polar Molecules

You find the difference in electronegativity values between the elements, and if the difference is greater than 0.5 than the molecule will be polar towards the more negative atom. However, if all atoms point towards - for example - a central atom, then the molecule is non-polar as there is no overall direction.

Joonsoo Kim 4L
Posts: 61
Joined: Fri Sep 28, 2018 12:29 am

### Re: Dipole Moments and Polar Molecules

You also have to determine the shape of the molecule, which also has an effect on the polarity of the molecule. For instance, on paper, NH3 seems like it would be a nonpolar molecule, since all of the dipole moments cancel each other out. However, since it is a trigonal pyramid (not trigonal planar) molecule, there is a dipole moment.