Sigma vs pi bonds

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

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Madelyn Cearlock
Posts: 72
Joined: Fri Sep 28, 2018 12:19 am

Sigma vs pi bonds

Postby Madelyn Cearlock » Sun Nov 25, 2018 5:07 pm

Can someone please explain to me the difference between sigma and pi bonds?

Schem_student
Posts: 29
Joined: Fri Sep 28, 2018 12:19 am

Re: Sigma vs pi bonds

Postby Schem_student » Sun Nov 25, 2018 5:13 pm

Sigma bonds are made up of two orbitals in which 1 electron from each atom interact end to end. This is an s-s orbital overlap and allows for rotation. A pi bond is made up of a side by side overlap of orbitals and prevents rotation.

Yvonne Du
Posts: 64
Joined: Fri Sep 28, 2018 12:23 am

Re: Sigma vs pi bonds

Postby Yvonne Du » Sun Nov 25, 2018 5:14 pm

A sigma bond is the very first bond between two atoms, while pi bonds are the ones that come after the sigma bond. For example in a triple bond, there is one sigma bond and two pi bonds.
Hope this helps.

Kavya Juwadi 3C
Posts: 30
Joined: Fri Sep 28, 2018 12:25 am

Re: Sigma vs pi bonds

Postby Kavya Juwadi 3C » Sun Nov 25, 2018 6:10 pm

Also, sigma bonds are generally more stable than pi bonds due to the fact that there is greater orbital overlap in sigma bonds

Jessica Chen 1F
Posts: 61
Joined: Fri Sep 28, 2018 12:17 am

Re: Sigma vs pi bonds

Postby Jessica Chen 1F » Sun Nov 25, 2018 6:35 pm

Sigma bonds are also stronger than pi bonds, so a double bond (sigma + pi) would overall still be weaker than 2 sigma bonds.

Raphael_SanAndres3C
Posts: 33
Joined: Fri Sep 28, 2018 12:24 am

Re: Sigma vs pi bonds

Postby Raphael_SanAndres3C » Sun Nov 25, 2018 6:41 pm

Think of sigma bonds being the inital bond between two molecules and every additional bond being a pi bond.

Desiree1G
Posts: 62
Joined: Fri Sep 28, 2018 12:16 am
Been upvoted: 2 times

Re: Sigma vs pi bonds

Postby Desiree1G » Sun Nov 25, 2018 6:44 pm

A sigma bond is the strongest type of covalent chemical bond. A pi bond contains p-p orbitals and it is a covalent bond formed by the side to side overlap of orbitals, which can be easily broken. Also, a single bond consists of a sigma bond, and let's say you have a double bond, this consists of a sigma bond and a pi bond.

Jonathan Pai 2I
Posts: 121
Joined: Fri Sep 28, 2018 12:27 am

Re: Sigma vs pi bonds

Postby Jonathan Pai 2I » Sun Nov 25, 2018 6:47 pm

Sigma's bond along the same orientation axis. Pie bonds don't, so there is no rotation. Pie bonds are weaker than Sigma bonds because they don't have overlap, so weaker attraction


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