Polarity with non-polar bonds

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romina_4C
Posts: 100
Joined: Thu Jul 11, 2019 12:17 am

Polarity with non-polar bonds

Postby romina_4C » Fri Nov 22, 2019 10:20 am

Can a molecule be polar if it only has non-polar bonds? How do lone pairs factor into the polarity of a molecule?

Sartaj Bal 1J
Posts: 101
Joined: Thu Jul 25, 2019 12:17 am

Re: Polarity with non-polar bonds

Postby Sartaj Bal 1J » Fri Nov 22, 2019 10:52 am

If a molecule only has non polar bonds, then the it will be non polar. Usually when a molecule has a lone pair, it is polar. However, in molecules like XeF4 (2 lone pairs), the dipole moments and lone pairs cancel out, rendering the molecule non polar. Hope this helps!

405335722
Posts: 56
Joined: Fri Aug 30, 2019 12:16 am

Re: Polarity with non-polar bonds

Postby 405335722 » Fri Nov 22, 2019 11:31 am

as long as dipoles (differences in electronegativity) cancel out symmetrically around the central atom, the molecule will be nonpolar

Kaitlyn Ang 1J
Posts: 116
Joined: Fri Aug 09, 2019 12:17 am
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Re: Polarity with non-polar bonds

Postby Kaitlyn Ang 1J » Fri Nov 22, 2019 12:12 pm

Adding to this, make sure to recognize that just because a Lewis structure might look like it's symmetrical, you have to take into account the VSEPR shape to see if the molecule truly is symmetrical (i.e. tetrahedrals such as CH2Cl2 in a Lewis structure looks symmetrical, but in VSEPR, it's not)


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