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Bao Tram Nguyen
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Postby Bao Tram Nguyen » Sun Oct 27, 2019 1:01 am

When does a substance have resonance?

claribel charway 1I
Posts: 55
Joined: Wed Sep 11, 2019 12:15 am

Re: Resonance

Postby claribel charway 1I » Sun Oct 27, 2019 1:11 am

A substance has resonance when the molecule requires a double bond that can be shifted to another single bond. As long as there's at least three elements and a required double bond, a resonance structure can be made.

Posts: 102
Joined: Wed Sep 18, 2019 12:18 am

Re: Resonance

Postby CMaduno_1L » Sun Oct 27, 2019 1:42 am

That being said, some structures are more stable than others, even though the substance is the same. This is where the calculation of formal charges comes into play. Substances that have more atoms with a formal charge of 0 will be more stable.

Louise Lin 2B
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Joined: Sat Aug 17, 2019 12:15 am

Re: Resonance

Postby Louise Lin 2B » Sun Oct 27, 2019 2:34 am

Adding on to the replies above, make sure to always calculate the formal charge of each atom to make sure that you have arranged the best possible structure. Not all molecules with double or triple bonds will have resonant structures, so it is important to make sure.

Ada Chung 1C
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Re: Resonance

Postby Ada Chung 1C » Sun Oct 27, 2019 9:54 am

In the lecture, Dr. Lavelle also mentioned that resonance is the blend or average of structures. It is simpler to write different versions of the Lewis structure but as mentioned by other people it is important to check the formal charge and make sure that it is as close to 0 to find the best fitting structure.

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