Polar Bonds

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Chase Yonamine 1J
Posts: 62
Joined: Fri Sep 28, 2018 12:17 am

Polar Bonds

Postby Chase Yonamine 1J » Mon Nov 26, 2018 12:19 am

How do polar bonds with dipoles cancel?

Daniel Lai
Posts: 65
Joined: Fri Sep 28, 2018 12:28 am

Re: Polar Bonds

Postby Daniel Lai » Mon Nov 26, 2018 1:40 am

If they are opposite each other or have the same relative force of attraction, then they cancel out.

Alicia Gibbons 1B
Posts: 31
Joined: Fri Sep 28, 2018 12:17 am

Re: Polar Bonds

Postby Alicia Gibbons 1B » Mon Nov 26, 2018 1:16 pm

Consider SiF4. Si-F bond would be ionic (and polar, and have dipoles) because the electronegativity difference is greater than 2. However, since SiF4 is tetrahedral, this same force is exerted in four directions opposite to each other. The vectors would thus cancel out and the molecule would be nonpolar.

Kate_Santoso_4F
Posts: 72
Joined: Fri Sep 28, 2018 12:29 am

Re: Polar Bonds

Postby Kate_Santoso_4F » Mon Nov 26, 2018 1:47 pm

A good example of a nonpolar molecule with polar bonds is CO2. The central carbon will have a net positive charge and the two outer electrons will have a net negative charge. Since the shape of the molecule is linear, these two bond dipoles will cancel each other and the overall molecule will have zero dipole moment (nonpolar).


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