VESPR Model of H2O

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

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JinwooLee_1F
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VESPR Model of H2O

Postby JinwooLee_1F » Wed Nov 13, 2019 4:15 pm

I was looking up the VESPR model of H2O and it wasn't linear, which I expected it to be. Are there new models we are going to learn?

xenamclean_1G
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Joined: Sat Jul 20, 2019 12:15 am

Re: VESPR Model of H2O

Postby xenamclean_1G » Wed Nov 13, 2019 4:17 pm

I think we will learn more about its shape in particular (bent) on Friday or next week.

EmilyJoo_1G
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Re: VESPR Model of H2O

Postby EmilyJoo_1G » Wed Nov 13, 2019 4:19 pm

I was wondering the same thing. There are several other VSEPR shapes in the textbook he hasn't gone over, so he probably will in the next few lectures or so.

Abby Soriano 1J
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Re: VESPR Model of H2O

Postby Abby Soriano 1J » Wed Nov 13, 2019 4:25 pm

The presence of the two lone pairs on the oxygen makes it so that water has a bent (or angular) shape rather than linear. Lone pairs generally take up more space than bonded pairs do (since the electrons exist in a probability cloud rather than being confined in a bond) and so the repulsion of the lone pairs makes the molecule take on a bent shape. Dr. Lavelle will most likely go over this in more accurate detail on Friday.

Edmund Zhi 2B
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Re: VESPR Model of H2O

Postby Edmund Zhi 2B » Wed Nov 13, 2019 4:52 pm

We haven't gone over molecules with lone pairs yet. But in H2O, there are 4 regions of electrons. The two lone pairs repel the bonding pairs and the shape is actually bent.

annikaying
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Re: VESPR Model of H2O

Postby annikaying » Wed Nov 13, 2019 5:06 pm

H2O is bent. I'm assuming we will cover molecular shapes with lone pairs sometime in the next week.

Esha Chawla 2E
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Re: VESPR Model of H2O

Postby Esha Chawla 2E » Wed Nov 13, 2019 9:00 pm

JinwooLee_1F wrote:I was looking up the VESPR model of H2O and it wasn't linear, which I expected it to be. Are there new models we are going to learn?


Kind of - right now we have only considered the VSEPR model by looking at atoms. However, we also need to consider lone pairs when determining the molecular geometry of a given molecules, such as H2O. In lecture so far we have only considered shape based on atoms. Once we learn how lone pairs affect molecular shape, we will be able to understand why H2O is not linear, but rather bent.

Nare Nazaryan 1F
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Re: VESPR Model of H2O

Postby Nare Nazaryan 1F » Wed Nov 13, 2019 9:54 pm

H2O would be bent, with oxygen in the center and one hydrogen on the lower left of oxygen and the other on the lower right. This is due to the polarity of water, with the hydrogen atoms having partial positive charge and the dipole arrows being directed toward the oxygen (partial negative charge). Otherwise, if it was linear, the dipole arrows would cancel each other (both pointing from hydrogen to oxygen) and water would be nonpolar, which is definitely not the case.
Last edited by Nare Nazaryan 1F on Wed Nov 13, 2019 9:58 pm, edited 1 time in total.

Micah3J
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Re: VESPR Model of H2O

Postby Micah3J » Wed Nov 13, 2019 9:56 pm

I was wondering about the example of the VSEPR Model of CO3 that we went over in lecture today. Does the double bond cause it to have any polarity?

Julieta Serobyan4D
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Re: VESPR Model of H2O

Postby Julieta Serobyan4D » Wed Nov 13, 2019 10:57 pm

Micah3J wrote:I was wondering about the example of the VSEPR Model of CO3 that we went over in lecture today. Does the double bond cause it to have any polarity?

Yes!! C has partially positive charge and O has partially negative charge.

ABombino_2J
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Re: VESPR Model of H2O

Postby ABombino_2J » Thu Nov 14, 2019 3:33 pm

H20 has a bent shape because it has 2 lone pairs and 2 single bonds. When trying to determine shape, count all the bonding regions and lone pairs. I assume we will learn about this in class on Friday.

705198479
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Re: VESPR Model of H2O

Postby 705198479 » Thu Nov 14, 2019 4:31 pm

H20 is bent

Michelle Xie 2B
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Re: VESPR Model of H2O

Postby Michelle Xie 2B » Thu Nov 14, 2019 7:47 pm

H2O is bent because of the two lone pairs on the oxygen.


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