Test 2 Sigma and Pi bonds

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Aiden Metzner 2C
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Test 2 Sigma and Pi bonds

Postby Aiden Metzner 2C » Sun Nov 17, 2019 1:38 pm

Will Sigma and Pi bonds be on test 2? And if so what is the difference between a sigma and a pi bond, I don't recall going over this in class.

Naji Sarsam 1F
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Joined: Sat Aug 17, 2019 12:18 am

Re: Test 2 Sigma and Pi bonds

Postby Naji Sarsam 1F » Sun Nov 17, 2019 1:42 pm

Yes, sigma and pi bonds will be on the exam. Dr. Lavelle discussed them very shortly at the end of Friday's lecture on 11/15/19. He will discuss them more on the upcoming Monday lecture on 11/18/19.

Briefly: single bonds have a sigma bond; double bonds have one sigma bond and one pi bond; triple bonds have one sigma bond and two pi bonds. The difference between sigma and pi bonds are the three-dimensional shape the bonding electron clouds make when the electrons are being shared between atoms.

Jielena_Bragasin2G
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Re: Test 2 Sigma and Pi bonds

Postby Jielena_Bragasin2G » Sun Nov 17, 2019 10:09 pm

Another thing to add to that is sigma bonds are able to rotate while pi bonds cannot rotate due to the strength of the bond.

Hussain Chharawalla 1G
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Re: Test 2 Sigma and Pi bonds

Postby Hussain Chharawalla 1G » Sun Nov 17, 2019 10:40 pm

I am confused as to why these bonds occur. Wouldn't you have electron-electron repulsion between adjacent electron clouds?

Caroline Zepecki
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Re: Test 2 Sigma and Pi bonds

Postby Caroline Zepecki » Sun Nov 17, 2019 10:44 pm

What is the relevance of having a sigma vs. a pi bond? is there an effect on bond strength and energy?

Vuong_2F
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Re: Test 2 Sigma and Pi bonds

Postby Vuong_2F » Mon Nov 18, 2019 1:43 am

905289082 wrote:What is the relevance of having a sigma vs. a pi bond? is there an effect on bond strength and energy?


They are used to predict the behavior of molecules in molecular orbital theory. In general, sigma bonds are stronger than pi bonds simply because there is more overlap.


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