lewis structure and vsepr

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

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An Dang 3F
Posts: 20
Joined: Fri Sep 29, 2017 7:07 am

lewis structure and vsepr

Postby An Dang 3F » Sat Nov 11, 2017 8:53 pm

When determining, the vsepr of a molecule, do we have to draw the lowest energy Lewis structure of the molecule first and then determine the vsepr?

allyz1F
Posts: 58
Joined: Sat Jul 22, 2017 3:00 am

Re: lewis structure and vsepr

Postby allyz1F » Sat Nov 11, 2017 9:03 pm

Drawing the Lewis structure usually helps to visualize what the actually VSEPR shape for the molecule is, but you can otherwise just memorize which shapes have how many bonds and lone pairs or use the notation (A= central atom, X= bonded atom, E= lone pair) to know which model a molecule is.

StephanieRusnak
Posts: 19
Joined: Fri Sep 29, 2017 7:07 am

Re: lewis structure and vsepr

Postby StephanieRusnak » Sun Nov 12, 2017 11:12 pm

you don't have to but it's very helpful

Sabah Islam 1G
Posts: 50
Joined: Sat Jul 22, 2017 3:01 am

Re: lewis structure and vsepr

Postby Sabah Islam 1G » Sun Nov 12, 2017 11:33 pm

Using the notation with (A= central atom, X= bonded atom, E= lone pair) is an alternative to drawing the lowest energy Lewis Structure because typically, molecules with the same AXE formula have the same general shape, so it may be helpful to understand which VSEPR shape coordinates to which AXE formula. Also, keep in mind that even though molecules with the same AXE formula have the same general shape, their bond angles may slightly differ.


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