Specific Naming Question

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

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Specific Naming Question

Postby AChoudhry_1L » Thu Nov 21, 2019 6:54 pm

For 2F 11A, the molecule we are given is SCl4. This is both trigonal bipyramidal and described as seesaw. Which should we be memorizing? Which one will we be asked for on the test?

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Re: Specific Naming Question

Postby Chem_Mod » Thu Nov 21, 2019 7:13 pm

I assume you mean 2E 11A.

The question asks for shape, so you would have to look at the difference between bonded and nonbonded electrons. The molecular geometry is seesaw. The reason why it says trigonal bipyramidal also is because that describes the electron arrangement ie the electronic geometry. The electronic geometry just looks at the whole electron pattern regardless of the difference between bonded vs nonbonded. Molecular geometry focuses on the arrangement of bonded e-.

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Re: Specific Naming Question

Postby BryantChung_4B » Fri Nov 22, 2019 12:42 pm

The electron geometry is considering all areas of electron density. Because this molecule has 5 such areas, it would be a trigonal bipyramidal shape. However, because one of the areas is a lone pair, the actual shape is a see-saw

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Re: Specific Naming Question

Postby Matt F » Sun Nov 24, 2019 12:32 pm

I think we only have to worry about molecular geometry for this class, just be aware of how many regions of electron density there are in general

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Re: Specific Naming Question

Postby Martina » Sun Nov 24, 2019 5:24 pm

If it asks for the shape, then you have to say see-saw. If it asks for the electron geometry as well then it is trigonal bipyramid.

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