textbook problem 2E 25

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

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Nan_Guan_1L
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textbook problem 2E 25

Postby Nan_Guan_1L » Sun Dec 13, 2020 4:55 am

in textbook problem 2E 25, the answer said that SF4 is a non polar molecule. however when I drew out the VSEPR, the molecule has a lone pair on S atom and shouldn't it be polar? thanks!
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Benjamin_Hugh_3F
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Re: textbook problem 2E 25

Postby Benjamin_Hugh_3F » Sun Dec 13, 2020 5:13 am

I think you're right on this question. SF4 is a non-polar molecule with a see-saw shape.
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Nancy Yao
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Re: textbook problem 2E 25

Postby Nancy Yao » Wed Dec 16, 2020 6:13 am

In VSEPR theory, the lone pair forces the molecular geometry of SF4 into a see-saw shape. Two of the S-F bonds are pointing away from each other, and their bond dipoles cancel. But the other two S-F dipoles are pointing "down". Their bond dipoles do not cancel, so the molecule is polar.
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