Remembering

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

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Jennifer Torres 2L
Posts: 62
Joined: Tue Nov 14, 2017 3:01 am

Remembering

Postby Jennifer Torres 2L » Tue Nov 13, 2018 10:16 pm

I'm. having a hard time remembering how to determine the VSERP does anyone have any tricks or strategies to remember which go with which?

jonathanjchang2E
Posts: 61
Joined: Fri Sep 28, 2018 12:26 am

Re: Remembering

Postby jonathanjchang2E » Tue Nov 13, 2018 11:01 pm

I don't think you can get away without remembering the names of the different shapes but it is helpful to know the lewis structures and bonds and lone pairs when determining the shape.

2c_britneyly
Posts: 62
Joined: Fri Sep 28, 2018 12:16 am

Re: Remembering

Postby 2c_britneyly » Tue Nov 13, 2018 11:22 pm

It helps if you start by memorizing the basic models where the central atom is bonded to all atoms, such as octahedral. From there, you can replace each bonding atom with lone pairs of electrons and determine the shape. So for an octahedral, you can replace one bonding atom with a lone pair, and that would give you square pyramidal. If you remove another one, it will give you square planar. The best way to learn these is by organizing them into groups of structures that have the same number of high electron density sites.

Jessica Castro 2H
Posts: 60
Joined: Fri Sep 28, 2018 12:29 am

Re: Remembering

Postby Jessica Castro 2H » Tue Nov 13, 2018 11:42 pm

An easy way to do a VSEPR model is to start with the Lewis structures. Don't forget about formal charge. Once you have your designated lone pairs about the central atom, treat them as an area of high electron concentration, then space out all areas of high electron concentration away from each other. As far as the names, you're going to have to memorize them (start with the basic ones, the shape almost always correlates with its name).

Esther Lee 4H
Posts: 67
Joined: Fri Sep 28, 2018 12:29 am

Re: Remembering

Postby Esther Lee 4H » Wed Nov 14, 2018 10:46 am

https://i.pinimg.com/originals/8c/76/d0 ... bf7f24.png

here's a chart I've been using. you probably don't want to rely on it since we won't have it on the test but its been helpful for me to double check my answers with it before looking in the solutions manual

Alexa_Henrie_1I
Posts: 61
Joined: Fri Sep 29, 2017 7:03 am

Re: Remembering

Postby Alexa_Henrie_1I » Wed Nov 14, 2018 3:39 pm

^This chart is super helpful thank you for sharing it!

Nawaphan Watanasirisuk 3B
Posts: 58
Joined: Tue Nov 28, 2017 3:03 am

Re: Remembering

Postby Nawaphan Watanasirisuk 3B » Wed Nov 14, 2018 3:41 pm

Esther Lee 4D wrote:https://i.pinimg.com/originals/8c/76/d0/8c76d0df9e1d578b46a2d8fb02bf7f24.png

here's a chart I've been using. you probably don't want to rely on it since we won't have it on the test but its been helpful for me to double check my answers with it before looking in the solutions manual


Thank you so much for sharing!

Ethan Nishikawa 4D
Posts: 36
Joined: Fri Sep 28, 2018 12:16 am

Re: Remembering

Postby Ethan Nishikawa 4D » Wed Nov 14, 2018 5:05 pm

Are we expected to remember all of the shapes?

Alyssa Wilson 2A
Posts: 65
Joined: Fri Sep 28, 2018 12:18 am

Re: Remembering

Postby Alyssa Wilson 2A » Wed Nov 14, 2018 8:57 pm

I believe we will only be expected to know the shapes that Dr. Lavelle will cover in the following lectures, I think there are seven or eight shapes we will have to know.


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