Help with Oxidation - Organic Chemistry

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Question

A water molecule is converted to hydrogen peroxide through a series of reactions. What can you conclude about the oxygen molecule?

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Answer

Water, , has an oxygen atom with an oxidation number of whereas hydrogen peroxide, , has an oxygen atom with an oxidation number of . A less negative oxidation number suggests that the oxygen lost an electron. Recall that oxidation is the loss of electrons whereas reduction is the gain of electrons; therefore, the oxygen atom lost an electron and was oxidized when water was converted to hydrogen peroxide.

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