Bond angles

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

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Saachi_Kotia_4E
Posts: 68
Joined: Fri Sep 28, 2018 12:23 am

Bond angles

Postby Saachi_Kotia_4E » Sun Nov 11, 2018 11:21 pm

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?

danicatran4
Posts: 35
Joined: Fri Sep 28, 2018 12:17 am

Re: Bond angles

Postby danicatran4 » Sun Nov 11, 2018 11:24 pm

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.

Ivan Tadeja 4B
Posts: 31
Joined: Fri Sep 28, 2018 12:28 am

Re: Bond angles

Postby Ivan Tadeja 4B » Sun Nov 11, 2018 11:27 pm

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.

Katelyn Phan 2A
Posts: 61
Joined: Fri Sep 28, 2018 12:23 am

Re: Bond angles

Postby Katelyn Phan 2A » Mon Nov 12, 2018 10:40 am

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.


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