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2013 Final #4

Posted: Mon Mar 13, 2017 4:08 pm
by Michelle_Nguyen_3F
Given , how would we write the half reactions? Thank you!

Re: 2013 Final #4

Posted: Mon Mar 13, 2017 10:09 pm
by Andrea Medina 1A
I have a similar question how would we know the moles of electrons if we are not given the charges and Fe is a transition metal?

Re: 2013 Final #4

Posted: Tue Mar 14, 2017 10:52 pm
by Pauline Tze 3B
2Fe(s) + 2H2O --> 2Fe(OH)2(s) + 4e-
pay attention to the charge for Fe as Fe is oxidized from 0 to +2
O2 + 4e- ----> 2Fe(OH)2(s)
pay attention to the charge for O as O is reduced from 0 to -2

Re: 2013 Final #4

Posted: Wed Mar 15, 2017 11:00 pm
by Paul Adkisson 1D
Wait, How would that work? The reduction reaction isn't balanced (Fe on products but not in reactants). I also had trouble determining n for this question.

Re: 2013 Final #4

Posted: Sat Mar 18, 2017 2:29 pm
by alvarado_natalie_2H
So we would calculate the electron number from the changes in charges seen in the corresponding half reactions?