Bond Angles

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

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Clarissa Cabil 1I
Posts: 66
Joined: Fri Sep 28, 2018 12:19 am

Bond Angles

Postby Clarissa Cabil 1I » Tue Nov 13, 2018 4:21 pm

When doing the homework, the solutions manual sometimes mentions how certain bond angles are "slight less than" 109.5º or 120º etc., but how can you tell if a certain shape is exactly, approximately, or slightly less than a certain degree?

Rachel Yoo 1F
Posts: 65
Joined: Fri Sep 28, 2018 12:24 am

Re: Bond Angles

Postby Rachel Yoo 1F » Tue Nov 13, 2018 4:32 pm

I think bond angles is something you just need to memorize by VSEPR

Becky Belisle 1A
Posts: 81
Joined: Fri Sep 28, 2018 12:18 am

Re: Bond Angles

Postby Becky Belisle 1A » Tue Nov 13, 2018 4:46 pm

I think slightly less than has to do with lone pairs affecting what the angle normally is for a certain structure.

Posts: 62
Joined: Wed Nov 15, 2017 3:04 am

Re: Bond Angles

Postby Shibhon_Shepard » Tue Nov 13, 2018 5:36 pm

If you do draw them out, I would recommend explicitly writing the degrees somewhere just to be safe. This will also show your TA that you know what bond angle is actually there without having to actually draw out a 109.5 degrees vs a 120 degree angle.

Grace Kim 1J
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Joined: Fri Sep 28, 2018 12:18 am
Been upvoted: 1 time

Re: Bond Angles

Postby Grace Kim 1J » Wed Nov 14, 2018 12:12 am

I had the same question at first, but I used resources online (like the link above) to help me know the bond angles. I think as you do more problems, you start to familiarize yourself with the different angles according to their molecular shape and eventually memorize them!

Veronica Soliman 4H
Posts: 51
Joined: Fri Sep 28, 2018 12:28 am

Re: Bond Angles

Postby Veronica Soliman 4H » Wed Nov 14, 2018 12:51 am

We did a demo in class where if it’s 4 bonds, you just recall it’s a 3d shape so while you would think it is 90 degrees, it’s actually 109 because it’s 3dinensional. The first 3 are pretty self explanatory so 2 bonds would likely be farther apart and are at 180 degrees.

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