Shapes

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

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Andy Chen 3L
Posts: 11
Joined: Wed Sep 21, 2016 3:00 pm

Shapes

Postby Andy Chen 3L » Sun Oct 30, 2016 9:41 pm

Do we consider lone pairs when figuring out the shape of the molecule?

Daniel La Cava 4B
Posts: 4
Joined: Fri Jul 22, 2016 3:00 am

Re: Shapes

Postby Daniel La Cava 4B » Sun Oct 30, 2016 9:44 pm

Yes we do. It is considered a field of electron density, so it does affect it.

Julianne_Zingmond_1E
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Re: Shapes

Postby Julianne_Zingmond_1E » Mon Oct 31, 2016 10:16 am

To add on, even though we do consider the lone pairs as fields of electron density that affect the bond angles and shape of a molecule, we only consider the position of the bound electron pairs when we name the shape of a molecule.

veeksha25
Posts: 29
Joined: Wed Sep 21, 2016 2:56 pm

Re: Shapes

Postby veeksha25 » Fri Nov 04, 2016 1:06 pm

Yes, we do. The lone pairs are vital in determining VSEPR shapes because the repulsion causes a change in shape, and thus, bond angle. For example, many molecules have bond angles of "less than" (180, for example) because even though the atoms may seem to be 180 degrees apart, in reality the repulsion caused by the lone pairs causes the bond angles to differ.

veeksha25
Posts: 29
Joined: Wed Sep 21, 2016 2:56 pm

Re: Shapes

Postby veeksha25 » Fri Nov 04, 2016 1:06 pm

Yes, we do. The lone pairs are vital in determining VSEPR shapes because the repulsion causes a change in shape, and thus, bond angle. For example, many molecules have bond angles of "less than" (180, for example) because even though the atoms may seem to be 180 degrees apart, in reality the repulsion caused by the lone pairs causes the bond angles to differ.

Ann Zhang_1M
Posts: 25
Joined: Wed Sep 21, 2016 2:59 pm

Re: Shapes

Postby Ann Zhang_1M » Sun Nov 06, 2016 11:11 am

Yes, we do need to consider the lone pairs since the lone pairs repel other electrons and they can make the bond angle change. For example, if there are 2 molecules that both have 5 electron density regions, but 1 has only one lone pair in the central atom and another one has two, the molecular shapes of these two molecules are different.

Myra_Zhan_2N
Posts: 25
Joined: Fri Jul 22, 2016 3:00 am

Re: Shapes

Postby Myra_Zhan_2N » Mon Nov 07, 2016 11:27 am

Yes, the number of bonded atoms and number of unpaired electrons relative to the central atom is what determines the shape and bond angles of the molecule.


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