VSEPR

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

Moderators: Chem_Mod, Chem_Admin

Lauren Haight 1E
Posts: 73
Joined: Wed Sep 18, 2019 12:15 am
Been upvoted: 1 time

VSEPR

Postby Lauren Haight 1E » Sun Nov 17, 2019 12:39 pm

I am a little confused as to what VSPER actually is and how it allows us to determine molecular shape.

Goyama_2A
Posts: 107
Joined: Sat Aug 24, 2019 12:17 am

Re: VSEPR

Postby Goyama_2A » Sun Nov 17, 2019 12:44 pm

The valence shell electron repulsion theory is the model by which we determine molecular shapes by determining the form of the molecule which would minimize the electrostatic repulsion. This helps us to determine shapes because our Lewis structures tell us the bonds and line pairs in a molecule but not the actual arrangement of the molecules. By looking at the location of the line pairs and bonds, we can use the VSEPR model shapes in order to determine the actual arrangement of the molecules with the least electrostatic repulsion. It also helps us with estimating bond angles and polarity.

JTijerina_4A
Posts: 46
Joined: Mon Sep 23, 2019 12:17 am

Re: VSEPR

Postby JTijerina_4A » Sun Nov 17, 2019 12:47 pm

In order to determine shape, VSEPR tells us to examine the number of regions with high electron density (double bonds, lone pairs etc.). We then place those regions of high electron density as far as physically possible in three dimensions and this dictates the shape.

MinuChoi
Posts: 100
Joined: Wed Sep 18, 2019 12:15 am

Re: VSEPR

Postby MinuChoi » Sun Nov 17, 2019 12:56 pm

Adding on, minimal electrostatic repulsion is achieved when the electron-dense regions (bonds and lone pairs) on an atom are farthest from each other. There is an approximate maximum angle between bonds that can be achieved based on how many bonds are on that atom, and that is the basis of the bond angles and geometry determined by the VSEPR model.

chari_maya 3B
Posts: 108
Joined: Sat Sep 07, 2019 12:18 am

Re: VSEPR

Postby chari_maya 3B » Sun Nov 17, 2019 1:32 pm

Why are different strength bonds treated the same when applying VSEPR?

Ashley Kumar 3F
Posts: 50
Joined: Sat Sep 07, 2019 12:18 am

Re: VSEPR

Postby Ashley Kumar 3F » Sun Nov 17, 2019 1:34 pm

VSEPR is what we use to determine the shape of a molecule to limit repulsion

Lauren Sanchez 3D
Posts: 52
Joined: Sat Aug 24, 2019 12:17 am

Re: VSEPR

Postby Lauren Sanchez 3D » Sun Nov 17, 2019 2:52 pm

chari_maya 3B wrote:Why are different strength bonds treated the same when applying VSEPR?

I think it has to do with the idea that the electrons account for one region of electron density, as in the bond strength does not matter as much as how many actual regions of electron density a molecule has.


Return to “Determining Molecular Shape (VSEPR)”

Who is online

Users browsing this forum: No registered users and 1 guest