• anonymous
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  • Stacey Warren - Expert
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  • chestercat
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  • Ciarán95
Everything you've said above seems to be correct @Itsokay - The oxygen goes from a 0 oxidation state in the reactants (on the left) to -2 in both of the products (on the right). So, its oxidation number has decreased, meaning it must have gained electrons. Memory Tip: Oxidation is Loss (of electrons), Reduction is Gain (of electrons) (OIL RIG) So, O has been reduced. If something has been reduced, then another species in the reaction must have been oxidised (loss of electrons). Can you spot what that is? (Hint: Oxygen will nearly always have an oxidation state of -2 when bonded to a less electronegative element, except in the case of H2O2).

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