VSEPR Notation

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

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Genisis Cabral
Posts: 20
Joined: Fri Sep 29, 2017 7:07 am

VSEPR Notation

Postby Genisis Cabral » Sun Nov 12, 2017 12:43 pm

When we use the VSEPR notation, we learned about how some molecules have the same formula. To clarify, in these situation, would the only difference between them be the slightly different bond angles?

Ivy Lu 1C
Posts: 54
Joined: Thu Jul 27, 2017 3:00 am

Re: VSEPR Notation

Postby Ivy Lu 1C » Sun Nov 12, 2017 2:48 pm

If two molecules have the same VSEPR formula, then they have the same shape. From the formula, we can only estimate what the bond angle is, though they may vary a bit for different molecules. We can't find out the true bond angle with the VSEPR formula, that has to be found experimentally.

Alexia Joseph 2B
Posts: 56
Joined: Thu Jul 27, 2017 3:01 am

Re: VSEPR Notation

Postby Alexia Joseph 2B » Sun Nov 12, 2017 3:45 pm

Basically there is the electron domain geometry and the actual shape of the molecule. The electron domain formula is AXn , where n is the number of domains. The number of domains includes both the lone pairs and the bonded pairs around the central atom. To determine the shape, the same basic concept is applied, except this needs to take into account the lone pairs and the bonded pairs, as the bond angles change depending on whether or not there is repulsion from a lone pair.

Timothy Kim 1B
Posts: 62
Joined: Fri Sep 29, 2017 7:04 am

Re: VSEPR Notation

Postby Timothy Kim 1B » Sun Nov 12, 2017 11:12 pm

With VSEPR Models, molecules can have the same amount of electron densities. The difference in these molecules can lie in the angles between the bonds. For instance, trigonal pyramidals have different bond angles. Sulfite have O-S-O bond angles of 106 degrees while NH3 has H-N-H bond angles that are 109.5 degrees.

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