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AXE formula

Posted: Sun Jun 03, 2018 10:51 pm
by danielruiz1G
is it possible to determine the shape of a molecule if you're only given the AXE formula, if so how do you do it?

Re: AXE formula

Posted: Sun Jun 03, 2018 10:54 pm
by Jessica Urzua-1H
It is possible. The AXE formula tells you how many regions of electron density there are, which ones are specifically bonding pairs, and which ones are lone pairs. This is all that is needed to determine molecular shape.

Re: AXE formula

Posted: Sun Jun 03, 2018 10:57 pm
by Jack Martinyan 1L
The chart below will be helpful

Re: AXE formula

Posted: Sun Jun 03, 2018 10:58 pm
by Enzo_1I
From what i understand it is necessary to know the shape that corresponds to the formula. This means memorizing which formulas are associated to which shape.

Re: AXE formula

Posted: Sun Jun 03, 2018 11:04 pm
by Patience Olsen 1A
Yes. A represents the center atom, X represents atoms bonded to the center atom, and E represents lone electron pairs. X and E together represent regions of electron density.
Each AXE formula corresponds to a different molecular structure shown in the chart posted by Jack.

Re: AXE formula

Posted: Sun Jun 03, 2018 11:05 pm
by Miya Lopez 1I
I believe if they give you the molecular formula and the AXE formula you could determine the shape. Say if you were given H2O: AX2E2... then you know there are 2 bonding atoms and 2 lone pairs. Then once you draw the molecule out you could figure out its shape.

Re: AXE formula

Posted: Sun Nov 18, 2018 11:00 pm
by Daniela Alvarado 3B
Enzo_1I wrote:From what i understand it is necessary to know the shape that corresponds to the formula. This means memorizing which formulas are associated to which shape.


do you happen to know if theres anyway to know the corresponding shape aside form the AXE formula? or must we memorize those too?

Re: AXE formula

Posted: Mon Nov 19, 2018 1:16 pm
by Rachel Dang 1H
There really isn't another way, the best thing to do is just memorize them because the AXE formula tells you what shape the molecule is.

Re: AXE formula

Posted: Fri Nov 23, 2018 8:36 pm
by Rami_Z_AbuQubo_2K
The only way for you to know the shapes is to simply memorize them using the table above or one that you can search up online. By knowing AXE, that should in turn help you figure out the different geometric shapes of each molecule.

Re: AXE formula

Posted: Wed Nov 28, 2018 9:09 pm
by Kyither Min 2K
Yes. With the AXE formula you can deduce what shape and bond angle the molecule will have based on charts and tables.

Re: AXE formula

Posted: Sat Dec 01, 2018 3:16 pm
by Schem_student
Also be aware that AXE is a specific VSEPR Group that will help you determine MG or molecular geometry.

Re: AXE formula

Posted: Sat Dec 01, 2018 5:19 pm
by Erin Kim 2G
yes you can determine the molecular shape of the molecule, knowing the AXE formula because the number of electron densities are known. By counting the number of lone pairs and the number of atoms around the central atom you can know the shape and bond angles.

Re: AXE formula

Posted: Sat Dec 01, 2018 5:40 pm
by 005115864
It's possible but be aware of that there are molecules with different shapes but same AXE Formula. This is because they have the same number of electron densities. For instance, tetrahedral and trigonal pyramidal are both AXE4 because they both have 4 regions of electron densities.

Re: AXE formula

Posted: Sat Dec 01, 2018 8:10 pm
by SydBenedict2H
To learn these I just made a chart, or you can write down the one posted above as it can be super helpful, and then put it all into flashcards on quilt. I studied that until i had it memorized, then, doing a bunch of problems switches the memorization from route to actual understanding.

Re: AXE formula

Posted: Sun Dec 02, 2018 8:00 pm
by Phil Timoteo 1K
Yes with the AXE formula you can determine the shape of the molecule

Re: AXE formula

Posted: Mon Dec 03, 2018 6:00 pm
by Lauren Huang 1H
Yes, the AXE formula can help you draw the shape of the structure, but it will not tell you the elements involved.

Re: AXE formula

Posted: Mon Dec 03, 2018 8:27 pm
by Arlene Linares 3A
How do we figure out the AXE formula? I am still having trouble with this.

Re: AXE formula

Posted: Thu Dec 06, 2018 6:03 pm
by Jack Hewitt 2H
danielruiz1G wrote:is it possible to determine the shape of a molecule if you're only given the AXE formula, if so how do you do it?

Yes because the AXE formula tells you the regions of electron density which is all you need to determine the shape.

Re: AXE formula

Posted: Thu Dec 06, 2018 6:05 pm
by Jack Hewitt 2H
Arlene Linares 3A wrote:How do we figure out the AXE formula? I am still having trouble with this.

A is the central atom. X is the number of atoms bonded to the central atom. E is the number of lone pairs on the central atom.

Re: AXE formula

Posted: Sat Jul 20, 2019 6:25 pm
by Zachary Menz 1D
Yes, you can determine shape with the AXE formula. You should try to memorize them because it'll save time and guarantee correctness on exams, but you can also think about it in terms of regions of electron density, where X represents bonding pairs on the central atom and E represents lone pairs on the central atom.