Molecule Shape

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Victoria Luu - 1C
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Joined: Fri Sep 28, 2018 12:15 am

Molecule Shape

Postby Victoria Luu - 1C » Sat Nov 10, 2018 4:25 pm

How can you tell the shape of the molecule from the Lewis Structure?

Anjali_Kumar1F
Posts: 62
Joined: Fri Sep 28, 2018 12:25 am

Re: Molecule Shape

Postby Anjali_Kumar1F » Sat Nov 10, 2018 4:26 pm

Why is Hydrogen bond shape not 90 degrees but 109 degrees I didn't understand that part.

Julia Lee
Posts: 80
Joined: Fri Sep 28, 2018 12:29 am

Re: Molecule Shape

Postby Julia Lee » Sat Nov 10, 2018 4:30 pm

Anjali_Kumar3E wrote:Why is Hydrogen bond shape not 90 degrees but 109 degrees I didn't understand that part.


This is because in reality, molecules exist in 3 dimension, not 2. So in 3D, a molecule such as CH4 will try to maximize the distance between each bond, which will lead it to have 109.5 degrees between each bond rather than 90 degrees. If you were strictly looking at the shape in 2 dimension, it would be 90 degrees.

Germar G 4F
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Joined: Fri Sep 28, 2018 12:28 am

Re: Molecule Shape

Postby Germar G 4F » Sat Nov 10, 2018 4:45 pm

Lewis structures are a good starting point in finding the 3-D structure of a molecule, because they help us find an approximate location of binding e- and lone pair e-, which is what we need to determine the shape of a molecule (for example, if it's bent(H20) or linear (CO2)).

Kenan Kherallah 2C
Posts: 78
Joined: Fri Sep 28, 2018 12:17 am

Re: Molecule Shape

Postby Kenan Kherallah 2C » Sat Nov 10, 2018 4:49 pm

VSEPR also gives you structures based on experimentally observed results. Hence, the rules outlined in VSEPR will allow you to essentially represent structures in a 2-D manner.

Elizabeth Kim 4E
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Joined: Fri Sep 28, 2018 12:29 am

Re: Molecule Shape

Postby Elizabeth Kim 4E » Sun Nov 11, 2018 4:58 pm

VSPER allows you to tell the shape of the structure

Vanadium Wang 4H
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Joined: Fri Sep 28, 2018 12:19 am

Re: Molecule Shape

Postby Vanadium Wang 4H » Wed Nov 14, 2018 12:46 am

Using the Lewis structure, you can see how many electron pairs and lone electron pairs there are. From that you can write the VSEPR equation in the form AXnEn. From the VSEPR equation, you can refer to a chart for the molecular shape

Archana Biju 1G
Posts: 29
Joined: Fri Sep 28, 2018 12:18 am

Re: Molecule Shape

Postby Archana Biju 1G » Fri Nov 16, 2018 3:56 pm

From the lewis structure we can identify the number of lone pair and bonded electrons and from this we could classify the molecule to a shape.

Anjali_Kumar1F
Posts: 62
Joined: Fri Sep 28, 2018 12:25 am

Re: Molecule Shape

Postby Anjali_Kumar1F » Fri Nov 16, 2018 10:46 pm

Do we have to know how to draw each molecular shape for the test or are we just going to be identifying them?


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