SiO2 Polar or Nonpolar

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

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Joined: Sat Jul 22, 2017 3:00 am

SiO2 Polar or Nonpolar

Postby allyz1F » Sat Dec 09, 2017 5:58 pm

On the midterm there was a question on the bond type (polar, non polar, or ionic) of some molecules, and SiO2 was one of them. When you draw the structure it looks like it should be the oxygens flanking the silicon atom and both with double bonds connecting them. There are no lone pairs on the Si and theres a total of 16 e's, so I put the molecule is non polar and I got it wrong. Which means it must be polar, but how/why?

Emily Glaser 1F
Posts: 156
Joined: Thu Jul 27, 2017 3:01 am

Re: SiO2 Polar or Nonpolar

Postby Emily Glaser 1F » Sat Dec 09, 2017 6:00 pm

Hi Ally ;)

This question is talking about the bond polarity not the compound polarity. The dipole moments between Si and O are not equal. As a compound , yes, it is nonpolar

Angel R Morales Dis1G
Posts: 50
Joined: Sat Jul 22, 2017 3:01 am

Re: SiO2 Polar or Nonpolar

Postby Angel R Morales Dis1G » Sat Dec 09, 2017 9:51 pm

SiO2 has a linear shape, and since the elements at each end are the same, the pull is canceled out, making the overall compound non-polar.

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