Draw the lewis structure for the polyatomic hydroperoxyl ho2- anion. be sure to include all resonance structures that satisfy the octet rule. c

.. .. .. [h-o-o:]- <--> [h-o=o:]- .. .. .. .. There is an overall negative charge for the ion due to the additional unbonded electron on the second oxygen atom. The electrons, although not favored, can form an oxygen-oxygen double bond, as a resonance structure.

In hydroperoxil an extra unbounded electron form double bond between oxygen as resonance structure.  

Hydroperoxil's  Lewis structure is given in picture.

As we can see here,

The net negative charge on compound is forming  This is due to an extra electron on second oxygen atom.This extra electron led to the formation of an Oxygen=Oxygen double bond. Usually not favored.

Hence, we can conclude that In hydroperoxil an extra unbounded electron form double bond between oxygen as resonance structure.  

To know more about Lewis structure, refer to the link:

link

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The teacher is mostly talking about the distillation of a mixture