molecular shapes

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

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aaronharouni
Posts: 72
Joined: Fri Sep 28, 2018 12:15 am

molecular shapes

Postby aaronharouni » Sun Nov 11, 2018 2:34 pm

In class, Dr. Lavelle only reviewed a few of the molecular shapes. Should we be memorizing and learning how to draw all of the other ones as well?

Elizabeth Kim 4E
Posts: 60
Joined: Fri Sep 28, 2018 12:29 am

Re: molecular shapes

Postby Elizabeth Kim 4E » Sun Nov 11, 2018 2:36 pm

I don't think we have to

Kathryn Wilhem 1I
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Joined: Fri Sep 28, 2018 12:27 am

Re: molecular shapes

Postby Kathryn Wilhem 1I » Sun Nov 11, 2018 2:39 pm

We will probably be going more in depth and learning more this week.

timothy_ho_4B
Posts: 61
Joined: Fri Sep 28, 2018 12:29 am

Re: molecular shapes

Postby timothy_ho_4B » Sun Nov 11, 2018 3:14 pm

I'm positive that we will go over a lot of other shapes because we haven't gone over shapes like bent shape, which is the shape of H2O.

Cienna Henry 1J
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Re: molecular shapes

Postby Cienna Henry 1J » Sun Nov 11, 2018 4:11 pm

Do we have to memorize the shapes or is there a method we can follow to draw the structure?

Estelle Jung
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Joined: Fri Sep 28, 2018 12:29 am

Re: molecular shapes

Postby Estelle Jung » Sun Nov 11, 2018 4:25 pm

Hopefully we will learn more about shapes in lecture or discussion. I found this website that does a good job in explaining the different molecular shapes: http://intro.chem.okstate.edu/1314F00/L ... VSEPR.html

Alma Carrera 3C
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Joined: Fri Apr 06, 2018 11:02 am

Re: molecular shapes

Postby Alma Carrera 3C » Sun Nov 11, 2018 6:27 pm

I don't think Dr. Lavelle has mentioned the trigonal pyramidal shape, but it is the answer to question 4.7 in the 6th edition. It also says that the bond angles are 109.5 degrees (which is the same angle as a tetrahedral shape) so are these two shapes the same?

KarlaArevalo2F
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Re: molecular shapes

Postby KarlaArevalo2F » Sun Nov 11, 2018 7:40 pm

I think we might (should) get like the general shapes and structures on the formula sheet, at least that is what a past chem prof. gave us not to sure

Carlos De La Torre 2L
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Joined: Tue Oct 09, 2018 12:16 am

Re: molecular shapes

Postby Carlos De La Torre 2L » Sun Nov 11, 2018 8:10 pm

I think we have to be able to name the different shapes but its important to note that shape is different than the electron arrangement, the shape is named after the how the molecule looks (excluding lone pairs) so its possible for some vsepr models to have the same angles as there can be a lone pair repulsing the other atoms in place of an atom, which is where h2o gets its bent shape there are two lone pairs that are repulsing the h atoms giving the molecule a bent shape.

505211599
Posts: 60
Joined: Fri Sep 28, 2018 12:28 am

Re: molecular shapes

Postby 505211599 » Sun Nov 11, 2018 8:16 pm

I’m pretty sure we will have to know most of the molecular geometry up to 6 bonds. So that includes bond angle and name.

Rhea Churi 4K
Posts: 62
Joined: Fri Sep 28, 2018 12:28 am

Re: molecular shapes

Postby Rhea Churi 4K » Sun Nov 11, 2018 8:30 pm

He'll go over them most likely but eventually we'll have to know shape, name, bond angle, and hoe to draw molecules with up to 6 bonds.

Cienna Henry 1J
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Re: molecular shapes

Postby Cienna Henry 1J » Sun Nov 18, 2018 10:09 am

KarlaArevalo4D wrote:I think we might (should) get like the general shapes and structures on the formula sheet, at least that is what a past chem prof. gave us not to sure

The formula sheet is posted online and doesn't have any of the shapes on it

Chem_Mod
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Re: molecular shapes

Postby Chem_Mod » Sun Nov 18, 2018 6:01 pm

What you have to be able to do is correlate Lewis structures to proper VSEPR shapes. For example, if I give you IF5 (since it is AX5E), you need to know that it would be square pyramidal, although the shape you draw wouldn't have to reflect 3D structure.

SophiaKohlhoff4B
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Joined: Fri Sep 28, 2018 12:16 am

Re: molecular shapes

Postby SophiaKohlhoff4B » Sun Nov 18, 2018 6:10 pm

Alma Carrera 3C wrote:I don't think Dr. Lavelle has mentioned the trigonal pyramidal shape, but it is the answer to question 4.7 in the 6th edition. It also says that the bond angles are 109.5 degrees (which is the same angle as a tetrahedral shape) so are these two shapes the same?


The trigonal pyramidal I think is the same as tetrahedral shape, except instead of one of the bonds, there is a lone pair.


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