Polar and Non polar

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405404782 Gabriel Rigole 4F
Posts: 56
Joined: Sat Aug 17, 2019 12:18 am

Polar and Non polar

Postby 405404782 Gabriel Rigole 4F » Sun Nov 17, 2019 3:33 pm

How can you if a molecule is polar or nonpolar?

Trinity Vu 1D
Posts: 53
Joined: Fri Aug 30, 2019 12:15 am

Re: Polar and Non polar

Postby Trinity Vu 1D » Sun Nov 17, 2019 3:38 pm

You look for if the molecule can have dipole moments based on the difference of electronegativity between the two atoms. Electronegativity increases across and up the table. However, beware that a molecule can be overall non polar but still have polar bonds. This is because, for example, in a CO2 molecule each C-O bond is polar. However, using vector addition, the two dipole moments cancel each other out thus making CO2 non polar.

Aliya Jain 2B
Posts: 101
Joined: Wed Sep 11, 2019 12:16 am

Re: Polar and Non polar

Postby Aliya Jain 2B » Sun Nov 17, 2019 3:50 pm

You can also use molecular geometry to find polarity. For example, lone pairs on oxygen in h2o cause there to be bent geometry, which thus indicates that the molecule is polar.

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