Page 1 of 1

Bond Length

Posted: Sun Nov 11, 2018 3:08 am
by Ashvi_Luthra_4H
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?

Re: Bond Length

Posted: Sun Nov 11, 2018 9:40 am
by Olivia L 4E
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.

Re: Bond Length

Posted: Sun Nov 11, 2018 10:42 am
by Nicole Elhosni 2I
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.

Re: Bond Length

Posted: Sun Nov 11, 2018 11:39 am
by Caitlin_Murphy_3C
can a double bond and single bond for the same element be the same length?

Re: Bond Length

Posted: Sun Nov 11, 2018 12:51 pm
by Dhwani Krishnan 1G
I don't think so. By definition, single bonds are generally longer than double bonds, especially between the same elements.

Re: Bond Length

Posted: Sun Nov 11, 2018 8:38 pm
by Pritish Patil 1K
The trend follows that triple are are the shortest while single are the longest.

Re: Bond Length

Posted: Tue Nov 13, 2018 11:03 am
by Riley Dean 2D
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

Re: Bond Length

Posted: Wed Nov 14, 2018 9:36 am
by Chem_Mod
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.

Re: Bond Length

Posted: Sun Nov 18, 2018 8:28 pm
by Layla Manoochehri
how do we know the bond length? is it something we have to look up?

Re: Bond Length

Posted: Sun Nov 18, 2018 8:45 pm
by Luis_Yepez_1F
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.