HW 4.43

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

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Hannah Guo 3D
Posts: 56
Joined: Fri Sep 29, 2017 7:06 am

HW 4.43

Postby Hannah Guo 3D » Thu Nov 23, 2017 10:28 am

4.43 Noting that the bond angle of an sp3 hybridized atom is 109.5 and that of an sp2 hybridized atom is 120, do you expect the bond angle between two hybrid orbitals to increase or decrease as the s-character of the hybrids is increased?

The answer is: As the s-character of a hybrid orbital increases, the bond angle increases.

I don't understand the answer and can anyone please explain why. Thank you!

Janine Chan 2K
Posts: 71
Joined: Fri Sep 29, 2017 7:04 am

Re: HW 4.43

Postby Janine Chan 2K » Thu Nov 23, 2017 1:22 pm

The s-character in sp2 is more than that in sp3. The way I see it is in sp2, the ratio of s:p is 1:2, while the ratio in sp3 is 1:3. If the bond angle in sp2 is larger, that would mean an increased s-character would result in a larger bond angle.

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