The complete question is as follows:
Determine whether each of the following changes represents oxidation or reduction?
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
Out of all the options provided, those that represents reductions are Fe2O3 to Fe, CH3CH2OH to CH3CH3, NO3- to NO2-, KClO3 to KCl, and SO2 to S. (1, 2, 4, 6 and 7)
Also, those that represent oxidation include Mg to MgO, Ca to CaO, and C2H6O to C2H4O2 (3, 5 and 8)
Oxidation reaction takes place when there is loss of one or more electron while reduction is the opposite, that is, it has to do with gain of electrons.
There are two types of chemical reactions and these:
Oxidation reaction involves loss of electron by a molecules, hydrogen atom or iron during a chemical reaction.
More examples of Oxidation reaction include:
2Mg+O2 to 2MgO
Mg + O₂ to MgO
Reduction reaction involves the process of gaining electrons by molecules, atom or iron in a chemical reaction.
More Examples of reduction include:
Zn(s) + 2H+(aq) to Zn2+(aq) + H2(g)
CuO + Mg to Cu + MgO
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