Bond Angles

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

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Milena Aragon 2B
Posts: 60
Joined: Fri Sep 28, 2018 12:19 am

Bond Angles

Postby Milena Aragon 2B » Sun Nov 11, 2018 4:03 pm

Will we ever be asked to find the bond angles of a molecular structure? And if so, how would we go about doing that?

Srikar_Ramshetty 1K
Posts: 64
Joined: Fri Sep 28, 2018 12:27 am

Re: Bond Angles

Postby Srikar_Ramshetty 1K » Sun Nov 11, 2018 4:20 pm

I'm am pretty sure we will. Bond angles can be determined after finding the molecular structure of an atom. Certain structures have certain angles. For example, a tetrahedral structure will always have bond angles of ~109.5 degrees and a square planar structure will always have bind angles of 90 degrees. First, you would need to find the structure of a molecule then learn their specific bond angles, once you start drawing them you will be able to determine them without memorizing them.

Hope that helps!

arif_latif_2G
Posts: 60
Joined: Fri Sep 28, 2018 12:23 am

Re: Bond Angles

Postby arif_latif_2G » Sun Nov 11, 2018 4:27 pm

In the lecture outlines, it is mentioned on how we need to know " lone pairs are more likely to found in certain locations around a central atom and
how and why they affect the bond angles in a molecule, cation, or anion;" so it is not out of the question that we may need to know bond angles. You would have to ask Dr. Lavelle or your TA about it. Nevertheless, in order to find bond angles, you would need to know the VSEPR model. The model has associated bond angles that we may need to memorize, but remember that these values are theoretical so experiments can show different bond angles. I hope this clears up some confusion.

Michael_Navarro_1H
Posts: 29
Joined: Fri Sep 28, 2018 12:17 am

Re: Bond Angles

Postby Michael_Navarro_1H » Sun Nov 11, 2018 4:33 pm

Knowing bond angles is pretty much a matter of memorization. We'll be going over plenty of examples in class and be exposed to all the molecular geometries within the VSEPR model and their appropriate bond angles.

Jaedyn_Birchmier3F
Posts: 30
Joined: Fri Sep 28, 2018 12:26 am

Re: Bond Angles

Postby Jaedyn_Birchmier3F » Sun Nov 11, 2018 4:47 pm

Bond angles are determined by the shape of the molecule. For example BF3 is a trigonal planar shape so therefore all of the B-F angles are 120 degrees.

Aakash Tammana 3H
Posts: 18
Joined: Wed Nov 15, 2017 3:02 am

Re: Bond Angles

Postby Aakash Tammana 3H » Sun Nov 11, 2018 5:05 pm

We probably will, but it's not an overly complicated topic. Khan academy has some great videos covering this topic.

Phil Timoteo 1K
Posts: 101
Joined: Fri Apr 06, 2018 11:05 am

Re: Bond Angles

Postby Phil Timoteo 1K » Sun Nov 11, 2018 5:30 pm

I think we will, and there are also patterns to certain shapes that correlate with certain bond angles

joanneyseung22
Posts: 31
Joined: Fri Sep 28, 2018 12:15 am

Re: Bond Angles

Postby joanneyseung22 » Sun Nov 11, 2018 6:39 pm

As a follow up question: Do we need to know how to figure out the bond angles with lone pairs attached to the central atom? I know that there are pretty simple bond angles that we can memorize, like 180 degrees or 109.5, but I was wondering how that changes once there is a central atom with a lone pair for VSEPR.

Javier_Ochoa_DIS_3J
Posts: 33
Joined: Fri Sep 28, 2018 12:23 am

Re: Bond Angles

Postby Javier_Ochoa_DIS_3J » Sun Nov 11, 2018 7:03 pm

I assume that if we are expected to memorize the angles it would be the most commons ones.

Phil Timoteo 1K
Posts: 101
Joined: Fri Apr 06, 2018 11:05 am

Re: Bond Angles

Postby Phil Timoteo 1K » Sun Dec 02, 2018 7:31 pm

I believe we should know and depending on different shapes determine there bond angles

Minsub Lee 3E
Posts: 32
Joined: Fri Sep 28, 2018 12:25 am

Re: Bond Angles

Postby Minsub Lee 3E » Sun Dec 02, 2018 7:33 pm

@joanneyseung22 If there are lone pairs on the central atom, it will want to take up more space. Therefore, the bonded atoms will be condensed away from the lone pairs. Therefore, the bond angle will be slightly less than the standard bond angles of the molecular shape.

chris_tsai_4H
Posts: 52
Joined: Fri Sep 28, 2018 12:26 am

Re: Bond Angles

Postby chris_tsai_4H » Sun Dec 02, 2018 7:53 pm

Determine the VSEPR model for each individual atom and then determine what the bond angle would be based off of the model.

taryn_baldus2E
Posts: 62
Joined: Fri Sep 28, 2018 12:24 am

Re: Bond Angles

Postby taryn_baldus2E » Sun Dec 02, 2018 7:56 pm

Using the VSEPR model, you will be expected to list the bond angle of a molecule in relation to its central atom.


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