Bond Angles

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

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Michael Du 1E
Posts: 117
Joined: Sun Sep 22, 2019 12:16 am

Bond Angles

Postby Michael Du 1E » Fri Nov 15, 2019 5:25 pm

Are we expected to know the exact bond angles on the test? Or just naming the shape of the molecule. Thank you!

Ryan Chang 1C
Posts: 105
Joined: Sat Aug 24, 2019 12:17 am

Re: Bond Angles

Postby Ryan Chang 1C » Fri Nov 15, 2019 5:31 pm

We are expected to know the shape of the molecule but not the exact bond angles. However, when there are lone pairs surrounding the central atom, we are expected to know that the bond angles are slightly less compared to central atoms with no lone pairs.

WesleyWu_1C
Posts: 117
Joined: Thu Jul 25, 2019 12:16 am

Re: Bond Angles

Postby WesleyWu_1C » Fri Nov 15, 2019 5:58 pm

Just know the basic bond angles for the shapes where there are no lone pairs attached to the central atom. The only bond angle that is a bit tricky to figure out is that for tetrahedral the bond angle is 109.5 degrees.

Arianna Perea 3H
Posts: 50
Joined: Thu Jul 25, 2019 12:17 am

Re: Bond Angles

Postby Arianna Perea 3H » Fri Nov 15, 2019 6:29 pm

The more lone pairs there are, the smaller the angles get?

Adrianh72
Posts: 48
Joined: Sat Aug 17, 2019 12:16 am

Re: Bond Angles

Postby Adrianh72 » Fri Nov 15, 2019 7:19 pm

Arianna Perea 3H wrote:The more lone pairs there are, the smaller the angles get?

Not always because sometimes the lone pairs are on opposite sides so the repulsions can cancel each other out.

Maeve Miller 1A
Posts: 51
Joined: Fri Aug 09, 2019 12:16 am

Re: Bond Angles

Postby Maeve Miller 1A » Fri Nov 15, 2019 7:38 pm

I think we will need to know the shape as well as the bond angles; we won't necessarily need to know the exact bond angle (in cases where lone pairs are present), but we will need to know an approximation (i.e. <109.5 in cases of trigonal pyramidal shape).


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