Resonance Structures

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ElizabethP1L
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Joined: Wed Nov 15, 2017 3:01 am

Resonance Structures

Postby ElizabethP1L » Sat May 19, 2018 8:34 pm

Should all resonance structures have the same formal charge?

Odalys Cuevas 1C
Posts: 31
Joined: Fri Apr 06, 2018 11:02 am

Re: Resonance Structures

Postby Odalys Cuevas 1C » Sat May 19, 2018 8:53 pm

I believe that for resonance structures the formal charge may be different and when choosing which is the better structure you choose the one with the lowest formal charge or closest that adds to zero.

004985802
Posts: 27
Joined: Fri Feb 02, 2018 3:00 am

Re: Resonance Structures

Postby 004985802 » Sun May 20, 2018 2:11 pm

Usually the formal charges will not be consistent because the electron distribution varies between resonance structures

Lenaschelzig1C
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Joined: Fri Apr 06, 2018 11:05 am

Re: Resonance Structures

Postby Lenaschelzig1C » Sun May 20, 2018 10:22 pm

I think that the resonance structures can have different bond placements, making the formal charge different in some cases. However, if the same elements in each are bonded, then the charge will be the same.

Elena 1H
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Re: Resonance Structures

Postby Elena 1H » Sun May 20, 2018 10:50 pm

I think the overall formal charge should be the same for each resonance structure, the formal charges of the individual elements in the molecule could be different because of the different bond placements, but overall I think it should be the same.

Steven Luong 1E
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Joined: Fri Apr 06, 2018 11:03 am

Re: Resonance Structures

Postby Steven Luong 1E » Thu May 24, 2018 12:30 am

Resonance structures when drawn are generally the same with the differences being the location of the bond (i.e. single/double/triple). Formal charges should correspond to the element depending on the bond connecting it to the central element.

Amir Akhavan 1E
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Joined: Fri Apr 06, 2018 11:01 am

Re: Resonance Structures

Postby Amir Akhavan 1E » Sun May 27, 2018 2:59 pm

The formal charges do not have to be the same for the different resonance structures.

Raquel Floyd 1K
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Re: Resonance Structures

Postby Raquel Floyd 1K » Fri Jun 01, 2018 10:37 am

So can a molecule still "have resonance" even if there is one structure that is the most stable form of it?

Erin Li 1K
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Re: Resonance Structures

Postby Erin Li 1K » Sat Jun 02, 2018 8:49 pm

No, resonance structures do not have to have the same formal charge for each element. however, the overall formal charge should be the same. For example, if it was No3-, overall it should have a -1 formal charge for the -

Kuldeep Gill 1H
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Re: Resonance Structures

Postby Kuldeep Gill 1H » Sat Jun 02, 2018 10:19 pm

Raquel Floyd 1K wrote:So can a molecule still "have resonance" even if there is one structure that is the most stable form of it?


I had the same question and I asked in TA office hours and they said yes. When we are doing resonance we will probably mostly see resonance as moving the double or triple bonds around but there may be some cases like you mentioned. Hope that helps!


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