Correct Bond Angles

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

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Michelle Fu 1H
Posts: 35
Joined: Fri Sep 28, 2018 12:19 am

Correct Bond Angles

Postby Michelle Fu 1H » Wed Nov 28, 2018 12:05 pm

So I was checking my HW and noticed that there is discrepancies between the angles accepted by the textbook and online guides for VSEPR angles. For example, the accepted angles found in the seesaw molecular shape is 120 and 90, yet most online sources list to angles to be slightly less in both.

I was wondering 1) Why there is a difference and 2) Is there a chart with the accepted bond angles for the book?

Kobe_Wright
Posts: 83
Joined: Fri Sep 28, 2018 12:16 am

Re: Correct Bond Angles

Postby Kobe_Wright » Wed Nov 28, 2018 12:51 pm

There will always be a slight difference between different molecules, and their intramolecular processes which we probably won't cover, but lmk if anyone gives you a table with Lavelles exact wants because right now it seems like as long as you're close it's okay.

Cameron_Greenberg_3C
Posts: 60
Joined: Fri Sep 28, 2018 12:26 am

Re: Correct Bond Angles

Postby Cameron_Greenberg_3C » Fri Dec 07, 2018 5:01 pm

Lone pairs will always have a stronger repulsion force than atoms, so it is unlikely that the bond angles would be exactly 90 or 120. The lone pair makes each angle slightly smaller.

Rosha Mamita 2H
Posts: 63
Joined: Fri Sep 28, 2018 12:19 am

Re: Correct Bond Angles

Postby Rosha Mamita 2H » Fri Dec 07, 2018 5:45 pm

This usually has to do with the lone pairs and how they create a grear repulsion, which makes bond angles slightly more different than the textbook value. In this case you would write that it is less than the normal bond angle

Raphael_SanAndres3C
Posts: 33
Joined: Fri Sep 28, 2018 12:24 am

Re: Correct Bond Angles

Postby Raphael_SanAndres3C » Fri Dec 07, 2018 5:47 pm

The angles of molecules with lone pair electrons always push the other bonds out of place and closer together, thus the bond angles are smaller in such situations.

Danny Zhang 4L
Posts: 62
Joined: Fri Sep 28, 2018 12:26 am

Re: Correct Bond Angles

Postby Danny Zhang 4L » Fri Dec 07, 2018 7:05 pm

There will always be a slight difference because of the unique properties of molecules that affect their interactions.

Joaquin Andrade
Posts: 31
Joined: Fri Sep 28, 2018 12:27 am

Re: Correct Bond Angles

Postby Joaquin Andrade » Fri Dec 07, 2018 10:25 pm

A general rule of thumb to remember is that the more lone pairs there are, the smaller the bond angle.


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