Bond Angles

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

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Nickolas Manipud 1C
Posts: 60
Joined: Fri Sep 29, 2017 7:07 am

Bond Angles

Postby Nickolas Manipud 1C » Sun Nov 19, 2017 4:19 pm

Do we have to know any other specific bond angles beside 90, 120, 180, and 109.5? For example, should we know that a trigonal pyramidal molecule has bond angles of 107 degrees or just that it is less than 109.5?

An Dang 3F
Posts: 20
Joined: Fri Sep 29, 2017 7:07 am

Re: Bond Angles

Postby An Dang 3F » Sun Nov 19, 2017 4:43 pm

I believe you do not have to memorize all the bond angles except for the ones you have listed. Instead, you should just know if the bonds are less than a certain angle due to lone pairs.

Emma Miltenberger 2I
Posts: 51
Joined: Thu Jul 27, 2017 3:00 am

Re: Bond Angles

Postby Emma Miltenberger 2I » Sun Nov 19, 2017 4:44 pm

I don't think you need to know any other specific angles as long as you know the general trend. For example, I think it would be acceptable to know that a trigonal pyramidal molecule has a bond angle slightly less than 109.5 degrees if you are able to explain why.

Miguel Velasco 2J
Posts: 40
Joined: Fri Sep 29, 2017 7:07 am
Been upvoted: 1 time

Re: Bond Angles

Postby Miguel Velasco 2J » Mon Nov 20, 2017 1:11 am

Know its less than (>109.5) and why (possible lone pairs)

McKenna disc 1C
Posts: 60
Joined: Fri Sep 29, 2017 7:04 am

Re: Bond Angles

Postby McKenna disc 1C » Mon Nov 20, 2017 12:16 pm

Agreed, I think it's important to note that bond angles will be smaller than expected in species with lone pairs because the lone pair-lone pair repulsion as well as the lone pair-bond repulsion will be stronger than any bond-bond repulsion, and therefore the bonds are forced closer to one another to minimize repulsion.


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