Types of Bonds

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

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joanneyseung22
Posts: 31
Joined: Fri Sep 28, 2018 12:15 am

Types of Bonds

Postby joanneyseung22 » Sun Nov 18, 2018 9:15 pm

What are the main differences between sigma-bonds and pi-bonds?

Andrea Zheng 1H
Posts: 61
Joined: Fri Sep 28, 2018 12:26 am

Re: Types of Bonds

Postby Andrea Zheng 1H » Sun Nov 18, 2018 9:24 pm

sigma bonds have orbitals end to end and allow the bound atoms to rotate. pi bonds have orbitals that overlap side to side and don't allow bound atoms to rotate. a single bond is a sigma bond and a double bond is one sigma one pi bond

Chloe Likwong 2K
Posts: 70
Joined: Fri Sep 28, 2018 12:23 am

Re: Types of Bonds

Postby Chloe Likwong 2K » Sun Nov 18, 2018 9:25 pm

Sigma bonds: end-to-end overlap and must form before a pi bond
Pi bonds: side-by-side overlap and it cannot exist w/o a sigma bond

To further clarify:

Bonds-
Single: 1 sigma, 0 pi
Double: 1 sigma, 1 pi
Triple: 1 sigma, 2 pi

arif_latif_2G
Posts: 60
Joined: Fri Sep 28, 2018 12:23 am

Re: Types of Bonds

Postby arif_latif_2G » Sun Nov 18, 2018 9:28 pm

Sigma bonds are formed by the end-to-end overlap of orbitals while Pi bonds are formed by the lateral overlap of orbitals. Since the overlap in sigma bonds is larger than the overlap in Pi bonds, sigma bonds are stronger.

604656370
Posts: 30
Joined: Fri Sep 28, 2018 12:25 am

Re: Types of Bonds

Postby 604656370 » Sun Nov 18, 2018 9:28 pm

Sigma bonds are the initial and strongest bonds formed between two atoms, whereas pi bonds are the subsequent bonds (2nd and 3rd) formed between the same atoms. For example, in O2 (double bond), the first bond created would be a sigma bond and the second one would be a pi bond. In N2 (triple bond), the first would be a sigma bond and the second and third would be pi bonds. In addition, sigma bonds interact end-to-end and allow bound atoms to rotate. Pi bonds, on the other hand, overal side-by-side and don't allow rotation.


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