Bond Length

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Caroline C 1G
Posts: 53
Joined: Fri Sep 29, 2017 7:05 am

Bond Length

Postby Caroline C 1G » Wed Nov 01, 2017 5:31 pm

Is there a way to calculate bond length, or is it a given value?

Emma Boyles 1L
Posts: 19
Joined: Thu Jul 27, 2017 3:00 am

Re: Bond Length

Postby Emma Boyles 1L » Wed Nov 01, 2017 7:12 pm

I think bond length is always a given value because we have no way to calculate it.

Catherine Yang 3G
Posts: 24
Joined: Fri Sep 29, 2017 7:06 am
Been upvoted: 2 times

Re: Bond Length

Postby Catherine Yang 3G » Wed Nov 01, 2017 10:20 pm

I agree. Dr. Lavelle mentions pretty frequently in class that he looks up the values.

Allyson Charco Dis1G
Posts: 21
Joined: Fri Sep 29, 2017 7:04 am

Re: Bond Length

Postby Allyson Charco Dis1G » Thu Nov 02, 2017 7:57 pm

Question: How do we know if we should make a bond : single, double, or triple?
Would we try to achieve a formal charge of 0 and that is how we would know.

Julie Steklof 1A
Posts: 50
Joined: Thu Jul 13, 2017 3:00 am

Re: Bond Length

Postby Julie Steklof 1A » Thu Nov 02, 2017 10:47 pm

I'm pretty sure bond length is determined experimentally.

Brandon Fujii 1K
Posts: 51
Joined: Fri Sep 29, 2017 7:04 am

Re: Bond Length

Postby Brandon Fujii 1K » Thu Nov 02, 2017 10:48 pm

First we must find the total number of electrons in the molecule. I usually make everything a single bond first and then adjust accordingly by adding double/triple bonds if I have too many electrons (more than the calculated total number of electrons that belongs in the molecule). Then we would calculate the Formal Charge of each atom to find the total formal charge of the molecule (which we would want to be zero because that is when the molecule is at the lowest energy state). I hope that this helps.

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