Stable Structures

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

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Arezo Ahmadi 3J
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Stable Structures

Postby Arezo Ahmadi 3J » Fri Nov 20, 2020 8:14 pm

When determining the molecular shape of a molecule, do you have to consider the most stable structure for its Lewis structure?

BaileyB1F
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Re: Stable Structures

Postby BaileyB1F » Fri Nov 20, 2020 8:18 pm

Yes, I think we do have to consider the most stable structure. Like in the lecture video on Wednesday from this week, try thinking of removing the individual atoms and seeing how stable they would be if you removed one from the side or one from the top (seesaw example). The more stable structure will have more repulsion (the atoms that are farther apart). I hope that helps.

Haochen He 3L
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Re: Stable Structures

Postby Haochen He 3L » Sat Nov 21, 2020 12:03 am

Yes, I think we should always consider the most stable structure when determining the shapes of molecules.

Sejal Parsi 3K
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Re: Stable Structures

Postby Sejal Parsi 3K » Sat Nov 21, 2020 4:37 am

Yes, as stated above, I think we always consider the most stable structure while determining the shapes of molecules.

Ava Nickman
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Re: Stable Structures

Postby Ava Nickman » Sat Nov 21, 2020 8:39 am

It depends what the question is asking. Sometimes you will need to draw all resonance structures while other times you will be asked to draw the most stable structure... it just depends. When in doubt being able to determine the most stable structure is very helpful.

Sean Wang 1F
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Re: Stable Structures

Postby Sean Wang 1F » Sat Nov 21, 2020 2:44 pm

Yes, and to add on, you find the most stable structure by calculating the formal charges of the atoms.

Stephen Min 1I
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Re: Stable Structures

Postby Stephen Min 1I » Sat Nov 21, 2020 2:45 pm

Usually we consider the most stable structure for its Lewis structure and we can do this by looking at the fewest number and magnitude of the formal charge.

Inderpal Singh 2L
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Re: Stable Structures

Postby Inderpal Singh 2L » Sat Nov 21, 2020 3:28 pm

The more stable the better :)

Emma_Barrall_3J
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Re: Stable Structures

Postby Emma_Barrall_3J » Sat Nov 21, 2020 4:00 pm

I would always use the most stable structure unless specifies otherwise. I think this was also sated in the instructions for the midterm :)

Nhu Pham-Dis3G
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Re: Stable Structures

Postby Nhu Pham-Dis3G » Sat Nov 21, 2020 4:24 pm

Yes, and you can determine stability based on formal charge!

Mahika More 1H
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Re: Stable Structures

Postby Mahika More 1H » Sat Nov 21, 2020 4:26 pm

Yes you must otherwise you may get a completely different shape then what is right.


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