Bond length, 2012 Midterm Question 6B

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Ashley Curtis 2O
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Joined: Wed Sep 21, 2016 2:59 pm

Bond length, 2012 Midterm Question 6B

Postby Ashley Curtis 2O » Tue Nov 01, 2016 8:17 pm

Using molecular orbital theory, list the following molecules from shortest bond length to the longest bond length.

B2^+, B2, B2^-, B2^2-

How would you tell which which would have to shortest or the longest length?

Camille_Rousculp_3A
Posts: 17
Joined: Wed Sep 21, 2016 3:00 pm

Re: Bond length, 2012 Midterm Question 6B

Postby Camille_Rousculp_3A » Tue Nov 01, 2016 8:24 pm

You use the molecular orbital diagram and find the bond order for each.

Diana_Visco_1l
Posts: 31
Joined: Fri Jul 15, 2016 3:00 am

Re: Bond length, 2012 Midterm Question 6B

Postby Diana_Visco_1l » Tue Nov 01, 2016 8:27 pm

Follow these steps.
1) Find lewis structures for all ions.
2) Ensure you draw structures correctly.
3) Examine the type of bonds being formed (i.e. single, double, triple, etc).

Note: The more bonds that appear between two atoms/ions, the more energy is present, and the closer the pull of electrons to the nucleus. In this sense, a triple bond is stronger and shorter than both a double bond and single bond. Likewise, a double bond is both stronger and shorter than a single bond.

Without revealing the answer at its entirety, I hope this helps :)

Ashley Curtis 2O
Posts: 21
Joined: Wed Sep 21, 2016 2:59 pm

Re: Bond length, 2012 Midterm Question 6B

Postby Ashley Curtis 2O » Sat Nov 12, 2016 11:13 pm

A better way to figure this out is by determining the bond order of each, rather than drawing out the lewis structures.


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