Molecular vs. VSEPR shape

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

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Husnia Safi - 1K
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Molecular vs. VSEPR shape

Postby Husnia Safi - 1K » Sun Jun 03, 2018 10:40 pm

In my discussion the molecular shape was discussed and the VSEPR shape. What is the difference? Does it have to do something with the lone pairs?

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Re: Molecular vs. VSEPR shape

Postby tmehrazar » Sun Jun 03, 2018 10:47 pm

What do you mean, like the lewis structure?

Elena 1H
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Re: Molecular vs. VSEPR shape

Postby Elena 1H » Sun Jun 03, 2018 10:48 pm

I think the VSEPR shape is determined by the number of regions of electron density and the molecular shape is the actual shape of the molecule once the lone pairs have been accounted for.

My TA used IF4+ as an example. It has 5 regions of electron density so its VSEPR shape is trigonal bipyramidal but since one of those regions is a lone pair, its molecular shape is seesaw.

Sorry a picture would probably be more helpful but i dont know how to put a picture on this

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Re: Molecular vs. VSEPR shape

Postby Chem_Mod » Sun Jun 03, 2018 10:49 pm

You draw the Lewis structure and you apply "VSEPR theory" to determine the molecular shape.

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