Bond Angles

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

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Bond Angles

Postby VGonzalez » Wed Nov 14, 2018 2:42 pm

Will we be asked for bond angles on shapes like trigonal pyramidal? Should we just memorize the generic angles of 109.5?

Sameen Mahmood 3D
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Re: Bond Angles

Postby Sameen Mahmood 3D » Wed Nov 14, 2018 2:49 pm

Considering they're always being brought up not just in lectures but also discussions and homework, I definitely think we'll be asked for bond angles for all structures.

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Re: Bond Angles

Postby Alexa_Henrie_1I » Wed Nov 14, 2018 3:37 pm

So the best way to know the angles is just through memorization of the structures right?

Fayez Kanj
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Re: Bond Angles

Postby Fayez Kanj » Wed Nov 14, 2018 3:40 pm


Yes, you need to memorize the bond angle of 109.5 for any tetrahedral molecule geometry. However, when there are shapes that are trigonal pyramidal ( 3 bonding pairs and 1 lone pair), you do not need to know the angles, just that they will be slightly less that 109.5. A good rule of thumb is that for every lone pair of electrons, subtract 2-3 degrees.

Hope this helps :)

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