VSEPR and Lewis Structures

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

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VSEPR and Lewis Structures

Postby 805291863 » Fri Nov 15, 2019 4:17 pm

Now that we have learned the VSEPR model for determining molecular shapes, does this mean a correct lewis structure (for the purposes of assessments) needs to be drawn in a manner similar to its molecular geometry?

-Should the lewis structure of BF3 be drawn with the F's equidistant from each other or is it okay to draw 2 F's opposite of each other and another F 90 degrees from those two?
-Should the lewis structure of H2O be drawn with the O's opposite from each other or should they be in a bent shape?

Rohit Ghosh 4F
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Re: VSEPR and Lewis Structures

Postby Rohit Ghosh 4F » Fri Nov 15, 2019 4:31 pm

No, Lewis structures do not have to be drawn according to the VSEPR model. Dr. Lavelle said this was the case in class.

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Re: VSEPR and Lewis Structures

Postby chemboi » Fri Nov 15, 2019 4:32 pm

To elaborate on the previous response, a valid lewis structure for NH3 would have the 3 H drawn perpendicularly to eachother.

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