Naming shape

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

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Nicole Shak 1L
Posts: 35
Joined: Wed Nov 22, 2017 3:03 am

Naming shape

Postby Nicole Shak 1L » Sat Jun 02, 2018 10:28 am

In our discussion, we were trying to clarify what the wording of the problem will be when it's asking for the shape, looking at lone pairs or not. To clarify, if a problem asks to state the molecular shape, is this the shape only looking at the atoms, and the geometry of the molecule is the VSEPR name including the lone pairs? For example, molecular shape of a molecule is see-saw, and VSEPR geometrical shape of that molecule is trigonal bipyramidal.

Eli Esagoff_1I
Posts: 38
Joined: Fri Apr 06, 2018 11:02 am

Re: Naming shape

Postby Eli Esagoff_1I » Sat Jun 02, 2018 11:01 am

I believe the ones with lone pairs have different names for the shapes.

ErinKim1I
Posts: 31
Joined: Fri Apr 06, 2018 11:03 am

Re: Naming shape

Postby ErinKim1I » Sat Jun 02, 2018 11:18 am

When a question asks for molecular shape, you have to take into account the number of areas of electron density, lone pairs, etc., not just the number of atoms.

MadelynNguyen1F
Posts: 59
Joined: Fri Apr 06, 2018 11:04 am

Re: Naming shape

Postby MadelynNguyen1F » Sat Jun 02, 2018 1:22 pm

You have to account for lone pairs, as they count as areas of electron density.

Alejandro Salazar 1D
Posts: 31
Joined: Fri Sep 29, 2017 7:05 am

Re: Naming shape

Postby Alejandro Salazar 1D » Sat Jun 02, 2018 2:21 pm

I believe we will need to know both the electronic(lone pair present) shape and the molecular shape

Therefore, it is a good idea to be able to recognize the AXE formula

Nandhini_2K
Posts: 60
Joined: Fri Apr 06, 2018 11:03 am

Re: Naming shape

Postby Nandhini_2K » Sat Jun 02, 2018 4:20 pm

Should look at its VSPER formula and that will take both the lone pairs and bonds into consideration to determine the shape.

AlyssaRivera
Posts: 29
Joined: Fri Apr 06, 2018 11:04 am

Re: Naming shape

Postby AlyssaRivera » Sun Jun 03, 2018 11:00 am

You have to take the lone pairs into consideration as well. As mentioned previously, you should memorize the AXE formula. The E in this formula represents the lone pairs. It can change the shape of the molecule a lot.

Alma Flores 1D
Posts: 64
Joined: Wed Nov 08, 2017 3:01 am

Re: Naming shape

Postby Alma Flores 1D » Sun Jun 03, 2018 3:17 pm

Since you are taking into consideration the lone pairs, the molecule would not be trigonal bipyramidal.


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