## Bond Angles

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

Emily Vainberg 1D
Posts: 102
Joined: Sat Jul 20, 2019 12:15 am

### Bond Angles

Are we just suppose to know what bond angles a shape has, or specifically the angle between each of the atoms in the given molecule. For example, SCl4 is a seesaw which has both 120 degree angles and 90 degree angles. Do we need to know where each of these angles are in the molecule.
- also I know for this one it may be easy to tell, but it isn't for all of them

Ellen Amico 2L
Posts: 101
Joined: Thu Sep 19, 2019 12:16 am

### Re: Bond Angles

You should know where the bond angles are in the structures if there's multiple. For example, in trigonal bipyramidal, you should know the 120 bond angles are between the 3 atoms in the same plane, the 90 degree angles are between the trigonal plane and the atoms above and below, and there's a 180 axial bond angle for the atoms above and below the trigonal plane. Sometimes it can be hard to tell but if you draw it out then it'll be easier to see!

Sanjana Munagala_1j
Posts: 103
Joined: Sat Aug 24, 2019 12:17 am
Been upvoted: 1 time

### Re: Bond Angles

It would also be helpful to know the general bond angles since there might be a question where you have a molecule with lone pairs in which case the bond angles are slightly lower than the normal angles we learn in class. You won't need to know the exact bond angle but just compare it with the common bond angles for the shapes with no lone pairs.
Hope that helps!

305416361
Posts: 50
Joined: Fri Aug 09, 2019 12:17 am

### Re: Bond Angles

I think we need to know the general bond angles and where they are located, however, for example in a bent structure, where the bond angle is <120, we only have to know that it is <120, not the exact angle for each specific structure.