2E.25 (7th ed)

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

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2E.25 (7th ed)

Postby Duby3L » Fri Nov 16, 2018 10:09 am

For the molecule CH2Cl2 if I arrange the two H's opposite of each other and the Cl's opposite of each other the dipole moments cancel out making it nonpolar, but if I don't rearrange the H's and Cl's opposite of each other it's a polar molecule. How would I know which is the correct polarity?

Raymond Ko 1H
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Re: 2E.25 (7th ed)

Postby Raymond Ko 1H » Fri Nov 16, 2018 11:18 am

The first instance with the Cl atoms arranged on opposite ends of the molecule would result in a nonpolar molecule as the Cl atoms, which are more electronegative, would have dipoles that cancel. However, when the Cl atoms are on the same side of the molecule, there is a net delta negative charge towards the Cl atoms, creating a dipole that makes the molecule polar.

juliefilice 4A
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Re: 2E.25 (7th ed)

Postby juliefilice 4A » Fri Nov 16, 2018 1:58 pm

But which is the correct way to arrange the atoms?

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