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Homework 4.43

Posted: Fri Nov 04, 2016 6:21 pm
by Taravat_Lakzian_1C
For question 43, it gives you that the bond angle of the sp^3 hybridized atom is 109.5 degrees and the bond angle of an sp^2 hybridized atom is 120 degrees.
The question asks if you expect the bond angle between two hybrid orbitals to increase or decrease as the s-character of the hybrids is increased? I know that the answer from the back of the books says that as the s-characters increase, the bond angle between two hybrid orbitals increases. Could someone please explain why, thank you.

Re: Homework 4.43

Posted: Fri Nov 04, 2016 7:03 pm
by Xinyi_Yan_3L
I don't know the exact reason, but we can make generalization by comparing sp3 and sp2 orbitals. The sp2 orbitals has less p-character and more s-character than sp3 (you may think of sp2 has 1/3 s, while sp3 has 1/4 s), and has lager bond angles.
Generally, the more s-character the hybrid orbital has, the more bonds the molecules has. Thus the bond angles are decreasing.