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Bond Angles

Posted: Mon Nov 12, 2018 1:24 pm
by AlyssaBei_1F
When determining bond angles, will a linear structure always have 180 degrees? Will a trigonal planar structure always have 120 degrees? Will a tetrahedral structure always have 109.5 degrees?

Re: Bond Angles

Posted: Mon Nov 12, 2018 2:08 pm
by Kim Tran 1J
Linear structures will always be 180 degrees. But trigonal planar can be 120 degrees or if it is trigonal planar bent then it will be less than 120 degrees. Tetrahedral is 109.5 degrees but if bent or trigonal pyramidal then it will be less than 109.5 degrees. So if the molecular geometry is not linear then there is a possibility of a different bond angle.

Re: Bond Angles

Posted: Mon Nov 12, 2018 2:17 pm
by Rylee Nelsen 3A
Yes, the angles depend on the structure of the molecule so for example Trigonal Planar has 0 lone pairs and is 120 degrees, Tetrahedral also has zero lone pairs and is 109.5 degrees and a T - shape has 2 lone pairs and is 90 degrees. Hope this helps!

Re: Bond Angles

Posted: Mon Nov 12, 2018 3:03 pm
by 705088777
If there are lone pair electrons it will make the degrees slight less than the usual value.

Re: Bond Angles

Posted: Mon Nov 12, 2018 3:12 pm
by Tyler Vu 4I
The values of the angles will be close to the ones you mentioned, but lone pair electrons and electron repulsion can change them slightly.