Determine whether each change represents oxidation or reduction. Oxidation Reduction C 2 H 6 O C2H6O to C 2 H 4 O 2 C2H4O2 Fe 3 + Fe3+ to Fe 2 + Fe2+ Cu Cu to Cu 2 + Cu2+ NO − 3 NO3− to NO − 2 NO2− C 6 H 12 O 6 C6H12O6 to CO 2 CO2 ubiquinone (a ketone) to ubiquinol (an alcohol) 2 Ag + 2Ag+ to 2 Ag 2Ag CH 3 CH 2 OH CH3CH2OH to CH 3 CH 3 CH3CH3