Vsepr Formula

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Netpheel Wang 4L
Posts: 60
Joined: Fri Sep 28, 2018 12:15 am

Vsepr Formula

Postby Netpheel Wang 4L » Thu Nov 15, 2018 8:59 pm

What is the difference between a vsepr formula and Lewis structures? What exactly is a vsepr formula supposed to look like?

505095972
Posts: 69
Joined: Fri Sep 28, 2018 12:17 am

Re: Vsepr Formula

Postby 505095972 » Thu Nov 15, 2018 9:02 pm

Basically VESPR is the 3D representation of the lewis structure. However, we won't be asked to draw them, we just have to be able to name the shape and draw the lewis structure.

Chase Yonamine 1J
Posts: 62
Joined: Fri Sep 28, 2018 12:17 am

Re: Vsepr Formula

Postby Chase Yonamine 1J » Thu Nov 15, 2018 10:51 pm

Molecule shapes can be predicted based on Lewis dot structure using the VSEPR theory. VSEPR stands for Valence Shell Electron Pair Repulsion. It states that electron pairs in the valence shell of an atom repel each other; their molecular geometry is the result of this repulsion. Basically, we use Lewis Dot Structures to help us predict the VSEPR shape of a molecule and how other molecules interact with it.

Nathan Tran 4K
Posts: 92
Joined: Fri Sep 28, 2018 12:16 am

Re: Vsepr Formula

Postby Nathan Tran 4K » Thu Nov 15, 2018 11:08 pm

In addition, when we are working with VSEPR theory, we might be asked to put the molecule in the form AXnEm. This helps us predict the actual 3d shape of the molecule while a lewis structure really only predicts the molecule in the 2d plane. Also, the lewis structure has things like single bonds, double bonds, and triple bonds, but VSEPR theory assumes that these bonds are already hybridized; we can see this by the principle that the number of bonds has no bearing on the shape, as regardless of the number of bonds between two atoms, there will still only be one region of electron density.

Dakota_Campbell_1C
Posts: 51
Joined: Fri Sep 28, 2018 12:15 am

Re: Vsepr Formula

Postby Dakota_Campbell_1C » Thu Nov 15, 2018 11:53 pm

For the E in the vesper formula does that take in account only the lone pairs of electrons on the central atom or in the whole structure.

duenezjuleny1D
Posts: 48
Joined: Fri Sep 28, 2018 12:24 am

Re: Vsepr Formula

Postby duenezjuleny1D » Fri Nov 16, 2018 12:53 am

The VSEPR Theory is basically a prediction of the molecular structure/geometry of a model based off of the number of electron lone pairs and attached atoms of molecules it is more 3D while Lewis structures are 2D.

LaurenJuul_1B
Posts: 65
Joined: Fri Sep 28, 2018 12:17 am

Re: Vsepr Formula

Postby LaurenJuul_1B » Fri Nov 16, 2018 1:12 am

VSEPR just helps us visualize the 3-D structure of a molecule while a lewis structure is a 2-D drawing. While lewis structures are useful in showing where bonds and lone pairs are, the VSEPR model helps us understand more about how a molecule will act in an environment and what 3-D structure it will appear in.

LedaKnowles2E
Posts: 62
Joined: Fri Sep 28, 2018 12:27 am

Re: Vsepr Formula

Postby LedaKnowles2E » Fri Nov 16, 2018 10:34 am

Lewis structures are the drawings we've been doing of where the electrons and bonds are in molecules. VSEPR formulas indicate the number of atoms and lone pairs of electrons around the central atom in a molecule, written as AXnEm, where A is the central atom, X are the surrounding atoms, n is the number of surrounding atoms, E are the surrounding lone pairs, and m is the number of surrounding lone pairs.


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