Pi and Sigma Bonds


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MedhaVallurupalli1F
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Joined: Wed Feb 27, 2019 12:15 am

Pi and Sigma Bonds

Postby MedhaVallurupalli1F » Sun Jul 21, 2019 4:08 pm

If there is a double bond or a triple bond, how many of the bonds would be pi and how many would be sigma?

Yilun Ding
Posts: 31
Joined: Tue Jun 25, 2019 12:15 am

Re: Pi and Sigma Bonds

Postby Yilun Ding » Sun Jul 21, 2019 5:19 pm

For a double bond, there will be one pi and one sigma, and one triple bond consists of two pi bonds and one sigma bond.

Yasmin Olvera 1D
Posts: 29
Joined: Thu Feb 14, 2019 12:15 am

Re: Pi and Sigma Bonds

Postby Yasmin Olvera 1D » Sun Jul 21, 2019 6:55 pm

I believe for Single bond it is a sigma bond .
Double bond is a sigma bond plus on pi bond.
A triple bond is a sigma bond plus two pi bonds .

Quynh Vo
Posts: 45
Joined: Sun Sep 29, 2019 12:15 am

Re: Pi and Sigma Bonds

Postby Quynh Vo » Thu Nov 14, 2019 7:49 pm

single bond = 1 sigma
double bond = 1 sigma, 1 pi
triple bond = 1 sigma, 2 pi

Jorge Ramirez_4H
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Joined: Wed Nov 21, 2018 12:19 am

Re: Pi and Sigma Bonds

Postby Jorge Ramirez_4H » Thu Nov 14, 2019 9:38 pm

Is this necessary to know?

AKatukota
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Joined: Thu Jul 25, 2019 12:18 am

Re: Pi and Sigma Bonds

Postby AKatukota » Thu Nov 14, 2019 10:10 pm

I think it's good to know!

Jenna Ortiguerra 4G
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Joined: Sat Aug 17, 2019 12:18 am

Re: Pi and Sigma Bonds

Postby Jenna Ortiguerra 4G » Thu Nov 14, 2019 11:19 pm

A single bond is one sigma. A double bond is one sigma and one pi. A triple bond is one sigma and two pi. As an example, think about CO2 where both oxygens are double bonded to carbon. In CO2, there are two sigmas and two pis.

Leyna Dang 2H
Posts: 87
Joined: Thu Jul 25, 2019 12:17 am

Re: Pi and Sigma Bonds

Postby Leyna Dang 2H » Thu Nov 14, 2019 11:28 pm

A single bond would have 1 sigma bond, a double bond would have a sigma bond and a pi bond, and a triple bond would have a sigma bond and 2 bonds.

Shail Avasthi 3C
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Joined: Fri Aug 30, 2019 12:17 am

Re: Pi and Sigma Bonds

Postby Shail Avasthi 3C » Fri Nov 15, 2019 12:48 am

Every bond after the first is a pi bond. (i.e. single bond = 1 sigma ; double bond = 1 sigma & 1 pi ; triple bond = 1 sigma & 2 pi)

William Francis 2E
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Re: Pi and Sigma Bonds

Postby William Francis 2E » Fri Nov 15, 2019 3:24 am

A double bond contains one sigma bond and one pi bond. A triple bond is one sigma bond and two pi bonds. You can remember this because sigma bonds correspond to orbitals in the s subshell of valence electrons. Since there is only one orbital in the s subshell, only one sigma bond can be made; the rest are pi bonds corresponding with orbitals from the p subshell.

ATingin_3I
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Joined: Fri Aug 30, 2019 12:17 am

Re: Pi and Sigma Bonds

Postby ATingin_3I » Sat Nov 16, 2019 3:21 pm

Valence bond theory goes as follows:
single bond = sigma bond
double bond= sigma and pi bond
triple bond = sigma and two pi bonds

Abraham De Luna
Posts: 31
Joined: Sat Sep 14, 2019 12:16 am

Re: Pi and Sigma Bonds

Postby Abraham De Luna » Sun Nov 17, 2019 7:56 pm

The way that it works is that a single bond would have a sigma bond. A double bond would have a sigma bong and pi bond and a triple bond would have a sigma bond and two pi bonds.

205150314
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Joined: Wed Feb 20, 2019 12:16 am

Re: Pi and Sigma Bonds

Postby 205150314 » Sun Nov 17, 2019 8:13 pm

why do we need to give bonds a secondary name? what do the names mean?

205389184
Posts: 85
Joined: Sat Sep 07, 2019 12:18 am

Re: Pi and Sigma Bonds

Postby 205389184 » Sun Nov 17, 2019 11:02 pm

For a double bond, there is 1 sigma bond and 1 pi bond and for a triple bond, there is 1 sigma bond and 2 pi bonds.

Ashley Osorio
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Joined: Thu Jul 11, 2019 12:17 am

Re: Pi and Sigma Bonds

Postby Ashley Osorio » Sun Nov 17, 2019 11:04 pm

205150314 wrote:why do we need to give bonds a secondary name? what do the names mean?

Yeah, why does it matter? It feels like they have no other significance other than giving bonds a new name.

Yiyang Jen Wang 4G
Posts: 76
Joined: Wed Nov 21, 2018 12:18 am

Re: Pi and Sigma Bonds

Postby Yiyang Jen Wang 4G » Sun Nov 17, 2019 11:30 pm

One sigma bond for single, double, triple bond. One pi bond for double bond, and two pi bonds for triple bonds.

Diana A 2L
Posts: 58
Joined: Sat Aug 17, 2019 12:16 am

Re: Pi and Sigma Bonds

Postby Diana A 2L » Sun Nov 17, 2019 11:52 pm

Ashley Osorio wrote:
205150314 wrote:why do we need to give bonds a secondary name? what do the names mean?

Yeah, why does it matter? It feels like they have no other significance other than giving bonds a new name.


the significance of sigma and pi bonds are that they indicate the angles and axis upon which the covalent bonds between atoms will occur and with which orbitals each bond is associated. For example, sigma bonds are normally bonds between the s-orbitals, and bonds between p-orbitals of different atoms are categorized by pi bonds. Sigma and pi bonds are different shapes also.

Diana A 2L
Posts: 58
Joined: Sat Aug 17, 2019 12:16 am

Re: Pi and Sigma Bonds

Postby Diana A 2L » Sun Nov 17, 2019 11:53 pm

Basically, pi and sigma bonds give you an idea of how electrons from different orbitals are shared within atoms in 3D space. That's really the only significance, and I believe that may be beyond the scope of this chemistry course.


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