Equal Bond Length

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Equal Bond Length

Postby emaad_3H » Sun Oct 27, 2019 9:16 pm

Can someone explain how a molecule has equal bond length when some are single and others are double?

Claire Stoecklein 1E
Posts: 49
Joined: Sat Jul 20, 2019 12:15 am

Re: Equal Bond Length

Postby Claire Stoecklein 1E » Sun Oct 27, 2019 9:28 pm

When we draw Lewis structures, we draw some bonds as single bonds and others as double bonds for the sake of simplicity; however, experimental bond lengths show us that extra electrons that make up double bonds simultaneously exist in the orbitals of all the bonds for that atom. Resonance structures are a blend of all the possible structures we could draw.

Angelo Mapalo 4E
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Joined: Sat Aug 24, 2019 12:18 am

Re: Equal Bond Length

Postby Angelo Mapalo 4E » Sun Oct 27, 2019 9:49 pm

Single and double bonds are drawn in Lewis dot structures, but those bonds are capable of being different equivalent locations. Electrons move around so that actual bond length is equal, representing the average bond length of the structure. This is represented in resonance.

Maeve Miller 1A
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Joined: Fri Aug 09, 2019 12:16 am

Re: Equal Bond Length

Postby Maeve Miller 1A » Sun Oct 27, 2019 10:14 pm

The structures have equal bond length because of resonance blending; we give the structures a single or double bond to simplify it. However, the real structure is an average of all the possibilities where each bond is the same length.

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Joined: Mon Sep 30, 2019 12:16 am

Re: Equal Bond Length

Postby AryaG_4C » Sun Oct 27, 2019 10:18 pm

In resonance, the single and double bond length is the same and is then the approx average of the two.

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