Bond Angle

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

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Tracey Tran 3I
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Joined: Thu Jul 11, 2019 12:16 am

Bond Angle

Postby Tracey Tran 3I » Thu Nov 14, 2019 10:55 am

Why is the bond angle of a trigonal pyramidal a little less than 109.5 degrees instead of being exactly 109.5 degrees?

Shannon Asay 1C
Posts: 102
Joined: Fri Aug 09, 2019 12:16 am

Re: Bond Angle

Postby Shannon Asay 1C » Thu Nov 14, 2019 11:18 am

It's because the lone pair of electrons over the central atom pushes the other electrons away from it, making the bond angles slightly smaller.

Matthew ILG 1L
Posts: 112
Joined: Sat Aug 17, 2019 12:15 am

Re: Bond Angle

Postby Matthew ILG 1L » Thu Nov 14, 2019 1:10 pm

When labeling the bonds in a trigonal pyramidal model are we allowed to say that it is 109.5 degrees or do we have to specify that it is slightly less than that?

Maia_Jackson_2C
Posts: 101
Joined: Fri Aug 30, 2019 12:17 am

Re: Bond Angle

Postby Maia_Jackson_2C » Thu Nov 14, 2019 2:07 pm

You should probably say that it is less than 109.5 degrees because that is technically more correct.

Brandon Valafar
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Re: Bond Angle

Postby Brandon Valafar » Thu Nov 14, 2019 2:18 pm

If there are lone pairs of electrons, those make the angle a little bit less than what it actually would be, due to repulsion.

Emma Joy Schaetz 1E
Posts: 43
Joined: Wed Sep 18, 2019 12:16 am

Re: Bond Angle

Postby Emma Joy Schaetz 1E » Thu Nov 14, 2019 2:23 pm

Are we going to have to know all of the bond angles for the different shapes?

DMuth_1J
Posts: 63
Joined: Thu Jul 11, 2019 12:15 am

Re: Bond Angle

Postby DMuth_1J » Thu Nov 14, 2019 2:39 pm

The bond angle allows the most space between electrons as is possible. And yes, I believe we have to memorize them.

Emma Joy Schaetz 1E
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Joined: Wed Sep 18, 2019 12:16 am

Re: Bond Angle

Postby Emma Joy Schaetz 1E » Thu Nov 14, 2019 2:43 pm

DMuth_1J wrote:The bond angle allows the most space between electrons as is possible. And yes, I believe we have to memorize them.

Do you know which shapes we will have to know?

DMuth_1J
Posts: 63
Joined: Thu Jul 11, 2019 12:15 am

Re: Bond Angle

Postby DMuth_1J » Thu Nov 14, 2019 2:45 pm

So far he has only gone over six, so I would imagine those for sure (especially considering they are considered the basic ones without lone pairs). As he teaches more I believe we will be responsible for all the ones he shows us.

Emma Joy Schaetz 1E
Posts: 43
Joined: Wed Sep 18, 2019 12:16 am

Re: Bond Angle

Postby Emma Joy Schaetz 1E » Thu Nov 14, 2019 3:03 pm

DMuth_1J wrote:So far he has only gone over six, so I would imagine those for sure (especially considering they are considered the basic ones without lone pairs). As he teaches more I believe we will be responsible for all the ones he shows us.

Okay thank you! Do you know how many there will be in total?


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