Molecular shape

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

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804991762_4A
Posts: 47
Joined: Fri Apr 06, 2018 11:04 am

Molecular shape

Postby 804991762_4A » Sun Jun 03, 2018 4:39 pm

When it asks to predict the shape of a species, how would you visualize it? Do we need to know the names by memory?

Elizabeth Parker 1K
Posts: 33
Joined: Wed Nov 15, 2017 3:00 am

Re: Molecular shape

Postby Elizabeth Parker 1K » Sun Jun 03, 2018 4:48 pm

Yeah do the Lewis structure first and then write out the VSEPR formula to help with the shape. The easiest way to get it is to just create a chart with all of the VSEPR formulas and shapes and commit it to memory so when you get a formula you know what shape. But you should be able to infer from the formula what the ape is or at least narrow it down to a few possibilities.

Madison Hacker 1L
Posts: 30
Joined: Fri Apr 06, 2018 11:03 am

Re: Molecular shape

Postby Madison Hacker 1L » Sun Jun 03, 2018 8:20 pm

You would visualize by the shape of the Lewis structure and number of lone pairs/bonded pairs. We only need to memorize the VSEPR shapes but not for each molecule.

Caitlyn Ponce 1L
Posts: 30
Joined: Fri Apr 06, 2018 11:04 am
Been upvoted: 1 time

Re: Molecular shape

Postby Caitlyn Ponce 1L » Sun Jun 03, 2018 9:04 pm

To help with visualization, you should look at the Lewis structure first to determine the areas of electron density. Then, you can determine the molecular structure based on the number of these areas.
We do need to know the names by memory since they will not be given on the exam (TA mentioned this).


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