Sigma vs Pi

Moderators: Chem_Mod, Chem_Admin

Bao Tram Nguyen
Posts: 35
Joined: Sat Aug 24, 2019 12:17 am

Sigma vs Pi

Postby Bao Tram Nguyen » Sun Nov 10, 2019 9:48 pm

What is the difference between these two bonds and why are they significant?

Maya Serota 3G
Posts: 53
Joined: Tue Sep 24, 2019 12:17 am

Re: Sigma vs Pi

Postby Maya Serota 3G » Sun Nov 10, 2019 9:49 pm

Sigma bonds are formed by end-to-end overlapping of atomic orbitals and Pi bonds are when the lobe of one atomic orbital overlaps another

saigorijavolu2k
Posts: 108
Joined: Sat Sep 28, 2019 12:15 am

Re: Sigma vs Pi

Postby saigorijavolu2k » Sun Nov 10, 2019 9:57 pm

Sigma bonds are found in all type of bond. Pi are found in at minimum a double bond.

KSong_1J
Posts: 101
Joined: Thu Jul 11, 2019 12:17 am

Re: Sigma vs Pi

Postby KSong_1J » Sun Nov 10, 2019 10:06 pm

You can find sigma bonds in single, double, and triple bonds while pi bonds are only found in double bonds (where there’s one sigma and one pi bond) and triple bonds (one sigma and two pi bonds).

saigorijavolu2k
Posts: 108
Joined: Sat Sep 28, 2019 12:15 am

Re: Sigma vs Pi

Postby saigorijavolu2k » Sun Nov 17, 2019 7:15 pm

Sigma bonds are found in double triple bonds and Pi bonds are found in single bonds. Sigma are stronger than pi

kevinolvera1j
Posts: 103
Joined: Fri Aug 02, 2019 12:15 am

Re: Sigma vs Pi

Postby kevinolvera1j » Sun Nov 17, 2019 8:28 pm

All single covalent bonds are sigma bonds. Double bonds include one sigma and one pi bond. Triple bonds include one sigma bond and two pi bonds.

PriscillaLi_3G
Posts: 63
Joined: Fri Sep 27, 2019 12:30 am

Re: Sigma vs Pi

Postby PriscillaLi_3G » Mon Nov 18, 2019 11:43 am

Do we have to know Sigma and Pi bonds for the test?

Paul Hage 2G
Posts: 105
Joined: Thu Jul 25, 2019 12:17 am

Re: Sigma vs Pi

Postby Paul Hage 2G » Mon Nov 18, 2019 1:00 pm

PriscillaLi_3G wrote:Do we have to know Sigma and Pi bonds for the test?

Yes, sigma and pi bonds are the last concepts we need to know for the test. Hybridization will not be covered on Test 2.

805394719
Posts: 104
Joined: Wed Sep 11, 2019 12:16 am

Re: Sigma vs Pi

Postby 805394719 » Mon Nov 18, 2019 1:04 pm

Sigma bonds overlap end-to-end to form a bond, whereas pi bonds form by overlapping side-by-side with each other. A significant difference is that sigma bonds allow rotation of atoms, whereas the pi bonds break if one of the atom rotates. Also, sigma bonds are more stable than pi bonds and form before pi bonds, therefore, pi bonds are only found in double and triple bonds.

Paul Hage 2G
Posts: 105
Joined: Thu Jul 25, 2019 12:17 am

Re: Sigma vs Pi

Postby Paul Hage 2G » Mon Nov 18, 2019 1:07 pm

Bao Tram Nguyen wrote:What is the difference between these two bonds and why are they significant?

The electrons in a sigma bond are referred to as localized between the internuclear space due to the way in which the orbitals overlap; on the other hand, pi bond electrons can be delocalized and can move around the molecule rather than remain in the internuclear space.
Sigma bonds affect molecular shape, whereas pi bonds do not affect molecular shape as defined by VSEPR (because VSEPR is an idealized model). In reality, it does contribute more electron density, but pi bonds do not affect the shapes that are determined by VSEPR.

Milisuryani Santoso 1L
Posts: 44
Joined: Thu Jul 11, 2019 12:15 am

Re: Sigma vs Pi

Postby Milisuryani Santoso 1L » Mon Nov 18, 2019 1:17 pm

Pi bonds also prevent atoms from rotating while sigma ones really only keep the atoms connected to each other

ariaterango_1A
Posts: 57
Joined: Wed Sep 18, 2019 12:15 am

Re: Sigma vs Pi

Postby ariaterango_1A » Mon Nov 18, 2019 1:20 pm

You should know the differences pi and sigma bonds form in orbital overlap. Pi bonds form side-to-side while sigma bonds form end to end. Additionally, single bonds are made up of one sigma bond, double bonds are made up of one sigma and one pi bond, and triple bonds are made up of one sigma and two pi bonds. Hope this helps!


Return to “Sigma & Pi Bonds”

Who is online

Users browsing this forum: No registered users and 1 guest