Bond Length

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Ashvi_Luthra_4H
Posts: 33
Joined: Wed Jun 13, 2018 3:00 am

Bond Length

Postby Ashvi_Luthra_4H » Sun Nov 11, 2018 3:08 am

Are there cases which a double bond and a single bond can be the same length? Is bond length dependent on what atoms are involved?

Olivia L 4E
Posts: 59
Joined: Fri Sep 28, 2018 12:23 am
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Re: Bond Length

Postby Olivia L 4E » Sun Nov 11, 2018 9:40 am

Yes they can be the same length. This would indicate that this Lewis structure is a resonance structure. We all know double bonds and single bonds are not equivalent so if the structure shows they are, this means the electron is delocalized and shifts from one atom to another in the middle.

Nicole Elhosni 2I
Posts: 62
Joined: Fri Sep 28, 2018 12:28 am

Re: Bond Length

Postby Nicole Elhosni 2I » Sun Nov 11, 2018 10:42 am

Bond length is dependent on what atoms are involved, but the trend follows that a triple bond will be the shortest and strongest and a single bond will be the longest and weakest.

Caitlin_Murphy_3C
Posts: 36
Joined: Fri Sep 28, 2018 12:23 am

Re: Bond Length

Postby Caitlin_Murphy_3C » Sun Nov 11, 2018 11:39 am

can a double bond and single bond for the same element be the same length?

Dhwani Krishnan 1G
Posts: 63
Joined: Fri Sep 28, 2018 12:17 am

Re: Bond Length

Postby Dhwani Krishnan 1G » Sun Nov 11, 2018 12:51 pm

I don't think so. By definition, single bonds are generally longer than double bonds, especially between the same elements.

Pritish Patil 1K
Posts: 60
Joined: Fri Sep 28, 2018 12:24 am

Re: Bond Length

Postby Pritish Patil 1K » Sun Nov 11, 2018 8:38 pm

The trend follows that triple are are the shortest while single are the longest.

Riley Dean 2D
Posts: 60
Joined: Fri Sep 28, 2018 12:15 am

Re: Bond Length

Postby Riley Dean 2D » Tue Nov 13, 2018 11:03 am

within a lewis structure if there is single and double bonds, then the bond length of all the bonds is going to going to be the same and it will be a length somewhere in between that of the length of the single bond and the length of the double bond, this is because this creates a more stable structure

Chem_Mod
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Re: Bond Length

Postby Chem_Mod » Wed Nov 14, 2018 9:36 am

Nominally, double bonds are shorter than single bonds. However, if you can draw a resonance structure in which the same atoms have a double or a single bond, this indicates the true bond length of those atoms is somewhere between single and double. Note this only applies if the resonance structures drawn are all valid (as in the case of nitrate NO3-). Because NO3- has a double bond and a single bond between N and O, and all the structures are equally valid, the true bond length is somewhere between an NO single bond and NO double bond.

Layla Manoochehri
Posts: 29
Joined: Fri Sep 28, 2018 12:28 am

Re: Bond Length

Postby Layla Manoochehri » Sun Nov 18, 2018 8:28 pm

how do we know the bond length? is it something we have to look up?

Luis_Yepez_1F
Posts: 50
Joined: Fri Sep 28, 2018 12:18 am

Re: Bond Length

Postby Luis_Yepez_1F » Sun Nov 18, 2018 8:45 pm

Layla Manoochehri wrote:how do we know the bond length? is it something we have to look up?

We do not need to know the exact bond length, we just need to know the trend of the size of bonds. There was an example of this on the midterm with how we have a double and single bond in resonance, which showed that the actual bond length would be between the measurements that were given to us.


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