(Polar molecules, Non-polar molecules, etc.)

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Tim Foster 2A
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Postby Tim Foster 2A » Mon Nov 27, 2017 3:16 pm

Why is this molecule polar? What's stopping the chlorines from being on opposite sides of the carbon, and their dipoles canceling? Why are they adjacent to each other instead?

Mike Vinci 2B
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Re: CH2Cl2

Postby Mike Vinci 2B » Mon Nov 27, 2017 4:42 pm

Given that we have 4 regions of electron density around the C atom, and also no loner pairs on the C atom, the shape of the molecule is tetrahedral. Therefore, it appears symmetrical in structure, and many times symmetry means non-polar. However, relating to your question, the difference in electronegatvity between the C and Cl, and C and H bonds makes the molecule polar. While an equal polarity is distributed by the the C and Cl, the opposite half of the molecule has a less/different polarity. As a result of the differing polarities on opposite sides of the molecule, they do not fully cancel each other out making the molecule polar.

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