Determine whether each of the following changes represents oxidation or reduction.

I dont know really your options in this question bt I guess they are 1) Fe2O3 to Fe 2) CH3CH2OH to CH3CH3 3) Mg to MgO 4) NO3- to NO2- 5)Ca to CaO 6) KClO3 to KCl 7) SO2 to S 8) C2H6O to C2H4O2
And if its like that we can say that All the ones that are REDUCTION are: 1,2,4,6 and 7 and the ones that are OXIDATION are 3,5 and 8. For you to remember we can say that oxidation involves loss of electrons and reduction involves gain of electrons 

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