Sigma and Pi bonds

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

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Chloe Orsini 1K
Posts: 32
Joined: Fri Sep 28, 2018 12:18 am

Sigma and Pi bonds

Postby Chloe Orsini 1K » Tue Nov 27, 2018 4:21 pm

Will someone just explain the difference between sigma and pi bonds and the significance/importance of them please?

505095972
Posts: 69
Joined: Fri Sep 28, 2018 12:17 am

Re: Sigma and Pi bonds

Postby 505095972 » Tue Nov 27, 2018 5:00 pm

So single bonds are sigma bonds. They are an overlap of two orbitals in one place. They can rotate.

Pi bonds occur for double and triple bonds. Double bonds have 1 sigma and 1 pi bond, while triple bonds have 1 sigma and 2 pi bonds. Pi bonds basically are an overlap of two orbitals in two places. This means they can not rotate because if they rotated, one of the two places where the overlapping orbitals are would "break" or no longer be touching.

Does this make sense?

Veronica Soliman 4H
Posts: 51
Joined: Fri Sep 28, 2018 12:28 am

Re: Sigma and Pi bonds

Postby Veronica Soliman 4H » Tue Nov 27, 2018 6:21 pm

Sigma bonds
allow bound atoms to rotate resulting, the sigma bond has electron denity and has cylindrical symmetry around the internuclear axis. It is also more stable.

Pi Bond
make it impossible to rotate or pi bond breaks, restriction on double and triple bonds, when 2 atoms are bound, then additional pi bonds overlap side by side. Can come from overlap of p-p orbital.

George Ghaly 2L
Posts: 66
Joined: Fri Sep 28, 2018 12:29 am
Been upvoted: 1 time

Re: Sigma and Pi bonds

Postby George Ghaly 2L » Tue Nov 27, 2018 8:10 pm

The main difference between sigma and pi bonds is that sigma bonds consist of one bond, while pi bonds consist of 2 bonds. Another difference between these two bonds is that sigma bonds allow for rotation while sigma bonds do not allow for any movement.

Erin Nash - 4G
Posts: 29
Joined: Fri Sep 28, 2018 12:27 am

Re: Sigma and Pi bonds

Postby Erin Nash - 4G » Tue Nov 27, 2018 10:25 pm

To build off of what other students have answered, sigma bonds are only for single bonds while pi bonds are double bonds and triple bonds. Pi bonds cannot rotate around the bond axis or else the bond will break. A double bonds consists of a sigma bond and a pi bond.


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