geometric angles

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

Moderators: Chem_Mod, Chem_Admin

Giovanni Anguiano-Gutierrez 3L
Posts: 52
Joined: Thu Jul 25, 2019 12:17 am

geometric angles

Postby Giovanni Anguiano-Gutierrez 3L » Sun Nov 17, 2019 4:38 pm

How do you determine the angles in a structure (i.e. 180 degrees of 109.5 degrees)?

Harry Zhang 1B
Posts: 101
Joined: Sat Sep 14, 2019 12:16 am

Re: geometric angles

Postby Harry Zhang 1B » Sun Nov 17, 2019 4:43 pm

The angles can only be determined experimentally but if there is no lone pair, each type of VSEPR structure has specific angles in between the bonds. To do this, you can only memorize the angles for more complex shapes such as tetrahedral... But for other shapes such as linear, the angles have to add up to 360, which makes the bond angle 180 between the atoms and in trigonal planar, 360/3=120.

Rhea Shah 2F
Posts: 97
Joined: Thu Jul 25, 2019 12:17 am

Re: geometric angles

Postby Rhea Shah 2F » Sun Nov 17, 2019 5:00 pm

Geometric angles in bonds are experimentally found. You can memorize the angles for each molecular shape, but each angle varies slightly as a result of lone pair interactions that are unique to each molecule. We're not expected to memorize the angles, but just know how to determine whether one angle is greater or less than another angle as a result of interactions within the molecule.

Kaylee Clarke 1G
Posts: 103
Joined: Fri Aug 30, 2019 12:15 am

Re: geometric angles

Postby Kaylee Clarke 1G » Sun Nov 17, 2019 5:04 pm

In the shapes without lone pairs, the angles are fairly simple; usually the 360 divided by the amount of elements bonding.. when there is a lone pair on the central atom, that changes. The angles of the structures will vary as a result of the new high electron density region

Nikki Razal 1L
Posts: 116
Joined: Fri Aug 30, 2019 12:17 am
Been upvoted: 1 time

Re: geometric angles

Postby Nikki Razal 1L » Sun Nov 17, 2019 5:05 pm

^^^ the geometric angles correspond with the VSEPR chart which depends on how many bonding pairs and lone pairs you have. for example a structure with 2 bonding pairs and 2 lone pairs would be bent and would have bond angles of less than 109.5 because of the lone pairs “pushing” on the angles in the structure

Return to “Determining Molecular Shape (VSEPR)”

Who is online

Users browsing this forum: No registered users and 3 guests