How does a resonance structure work?

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Adrienne B 1J
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How does a resonance structure work?

Postby Adrienne B 1J » Sat May 19, 2018 2:52 pm

I was wondering what defines resonance structures.

Dennisse Diaz 1D
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Re: How does a resonance structure work?

Postby Dennisse Diaz 1D » Sat May 19, 2018 3:00 pm

Resonance or mesomerism is a way of describing delocalized electrons within certain molecules or polyatomic ions where the bonding cannot be expressed by one single Lewis structure.

Tiffany Tufenkjian 1E
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Re: How does a resonance structure work?

Postby Tiffany Tufenkjian 1E » Sat May 19, 2018 7:14 pm

You are able to rearrange the bonds in different equivalent locations and still have the same formal charges. The real structure will be a resonance hybrid.

Cindy Nguyen 1L
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Re: How does a resonance structure work?

Postby Cindy Nguyen 1L » Sun May 20, 2018 12:17 am

If you can draw more than one Lewis structure that is equivalent to each other, then it displays resonance. This usually occurs in molecules that have double bonds and single bonds. For example, benzyne has double bonds on every other bond between two carbons (and single bonds for the other carbons). Another way of drawing benzyne would be putting the double bonds as the single bonds in the previous structure and single bonds as double bonds. These structures are equivalent, and therefore benzyne displays resonance.

breannasung_1K
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Re: How does a resonance structure work?

Postby breannasung_1K » Sun May 20, 2018 12:24 am

Resonance structures are lewis structures of the same compound, but the bonds may be arranged differently. However, all resonance structures still represent the same compounds.

Johanna Caprietta 1E
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Re: How does a resonance structure work?

Postby Johanna Caprietta 1E » Sun May 20, 2018 9:40 am

To add on, resonance can have different bonds as mentioned earlier. They can have partial bonds meaning that they could be between a single and double bond or between a double and triple bond.

Sarai Ventura 1L
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Re: How does a resonance structure work?

Postby Sarai Ventura 1L » Sun May 20, 2018 4:35 pm

Resonance structures are two forms of a molecule where the chemical connectivity is the same but the electrons are distributed differently around the structure. Resonance occurs when electrons can flow through neighboring pi systems. It is also known as a mesomerism and it is a way of describing delocalized electrons.

inlovewithchemistry
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Re: How does a resonance structure work?

Postby inlovewithchemistry » Tue Oct 30, 2018 11:39 pm

An important thing to remember about resonance structures, along with the above definitions, is that all of the bonds in the Lewis Structure have the same length. This displays that drawing resonance is just a way of showing that all of the bonds have the same length no matter where they are placed.

Zubair Ahmed 1L
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Re: How does a resonance structure work?

Postby Zubair Ahmed 1L » Wed Oct 31, 2018 11:24 am

Just to reiterate, resonance structures are basically lewis structures that can be written in multiple forms, the difference being the arrangement of the bonds between each resonance structure. The chemical properties are all the same.

Ian Marquez 2K
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Re: How does a resonance structure work?

Postby Ian Marquez 2K » Wed Oct 31, 2018 1:44 pm

Another important thing to note is the formal charges present within these structures. If you are trying to determine if something has resonance, check to see if the formal charges make sense when changing a bond. For example, a formal charge of +1 for chlorine in a possible resonance hybrid is highly unlikely since chlorine has a high electron affinity and high ionization energy. This should be a signal that there may not be resonance.

Sophie Roberts 1E
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Re: How does a resonance structure work?

Postby Sophie Roberts 1E » Wed Oct 31, 2018 2:46 pm

Resonance basically means that the lewis structure of a molecule can be written in different forms, but the one that is the most appropriate to use would be the one that has a formal charge of 0, because it means it is most stable. The general lewis structure of molecules with resonance would be the combination of all or the resonance hybrid as it is called.


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