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Correct Bond Angles

Posted: Wed Nov 28, 2018 12:05 pm
by Michelle Fu 1H
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?

Re: Correct Bond Angles

Posted: Wed Nov 28, 2018 12:51 pm
by Kobe_Wright
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.

Re: Correct Bond Angles

Posted: Fri Dec 07, 2018 5:01 pm
by Cameron_Greenberg_3C
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.

Re: Correct Bond Angles

Posted: Fri Dec 07, 2018 5:45 pm
by Rosha Mamita 2H
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

Re: Correct Bond Angles

Posted: Fri Dec 07, 2018 5:47 pm
by Raphael_SanAndres3C
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.

Re: Correct Bond Angles

Posted: Fri Dec 07, 2018 7:05 pm
by Danny Zhang 4L
There will always be a slight difference because of the unique properties of molecules that affect their interactions.

Re: Correct Bond Angles

Posted: Fri Dec 07, 2018 10:25 pm
by Joaquin Andrade
A general rule of thumb to remember is that the more lone pairs there are, the smaller the bond angle.