Resonance Structure Confusion

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Aimee Alvarado 3J
Posts: 62
Joined: Wed Sep 30, 2020 9:47 pm

Resonance Structure Confusion

Postby Aimee Alvarado 3J » Sun Nov 29, 2020 11:36 pm

There was a problem on Sapling that asked if all three structures were resonance structures. Why are they not considered this?

Emma Healy 2J
Posts: 100
Joined: Wed Sep 30, 2020 9:45 pm

Re: Resonance Structure Confusion

Postby Emma Healy 2J » Sun Nov 29, 2020 11:40 pm

They are not considered resonance structures because the structures and number of single, double, and triple bonds were changing for each one, and the electrons were not delocalized between the atoms.

Rose_Malki_3G
Posts: 123
Joined: Wed Sep 30, 2020 10:02 pm

Re: Resonance Structure Confusion

Postby Rose_Malki_3G » Sun Nov 29, 2020 11:40 pm

This is because the structures have different atom connectivities.

Ke Huang 2G
Posts: 74
Joined: Wed Sep 30, 2020 9:35 pm

Re: Resonance Structure Confusion

Postby Ke Huang 2G » Sun Nov 29, 2020 11:41 pm

This is because the structures are different for each drawn.

Kainalu Puu-Robinson
Posts: 51
Joined: Wed Sep 30, 2020 9:46 pm

Re: Resonance Structure Confusion

Postby Kainalu Puu-Robinson » Sun Nov 29, 2020 11:42 pm

I believe the question in the Sapling you were referring to was #17. These are not resonance structures of each other because the arrangement of the bonds is not the same between structures. Resonance structures by definition are "bonding in certain molecules or ions by the combination of several contributing structures into a resonance hybrid", and the bond strengths are actually the average between the different resonance structures. However, as you can see the shape of the molecules are different meaning they have very different bond strengths/lengths.

Emma Healy 2J
Posts: 100
Joined: Wed Sep 30, 2020 9:45 pm

Re: Resonance Structure Confusion

Postby Emma Healy 2J » Sun Nov 29, 2020 11:43 pm

An example of a resonance structure would be O3 because there is one single bond between an O and another O and one double bond between an O and another O. The electrons are delocalized and are shared in the molecule, and the single and double bonds could rotate between atoms and keep the same structure and follow the octet rule.


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