Dipole Moment

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Layal Suboh 1I
Posts: 61
Joined: Fri Sep 28, 2018 12:23 am

Dipole Moment

Postby Layal Suboh 1I » Tue Nov 20, 2018 8:31 pm

When are tetrahedrals polar and non polar? For example, a molecule like CCl4 is non polar because the atoms around Carbon are the same, but wouldn't there still be a dipole moment because of the 109.5 angle? I'm a little confused about when you know a molecule (in two planes) is polar or nonpolar.

Posts: 61
Joined: Fri Sep 28, 2018 12:26 am

Re: Dipole Moment

Postby jonathanjchang2E » Tue Nov 20, 2018 8:45 pm

The tetrahedral molecule has a dipole moment if one of the outer atoms is heavier than the others. For example, CH3Cl is polar because of the greater amount of electrons on the Cl than the three H atoms. If the non-central atoms are all the same like in CH4 or CCl4 the molecule will be nonpolar because the dipoles cancel out. The angle of the molecule is not as important when determining the polarity of a molecule.

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