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Bond angles

Posted: Sun Nov 11, 2018 11:21 pm
by Saachi_Kotia_4E
how do you know what the bond angles between atoms are from just knowing the structure? for example for 7th edition 2E.7 part c, how do you know that there is a 109.5 degree angle?

Re: Bond angles

Posted: Sun Nov 11, 2018 11:24 pm
by danicatran4
I have the sixth edition textbook so I don't think the problem coresponds, but I believe if you are given a molecule, you first would decide the struture - tetrahedral - which would then tell you the angles are 109.5 degrees.

Re: Bond angles

Posted: Sun Nov 11, 2018 11:27 pm
by Ivan Tadeja 4B
I believe that it has something to do with the shape of the molecule. VSEPR configurations include shapes such as: linear, trigonal, tetrahedral, etc... and since we know that each of the electrons distance themselves equally then we can use this to determine the angle. Ex: 2 molecules would be 180 degrees apart because 360/2. The process goes on to be more computational when computing angles in 3d, but I think the values are always consistent with respect to the orientation.

Re: Bond angles

Posted: Mon Nov 12, 2018 10:40 am
by Katelyn Phan 2A
You would know the bond angles from knowing the shape based on electron repulsion. The number of pairs around the central atom will repel one another creating semi-symmetric bond angles. This is based on the angle that allows the electrons to be as far as possible away from others.