Posted by Chelsea on Tuesday, May 18, 2010 at 11:07am.
Zn + OH^- ==> Zn(OH)4^- + 2e
6H2O + NO3^- + 8e ==>NH3 + 9OH^-
Here is a site that you can access for rules for assigning oxidation states up to an including how to balance redox equations (and half reactions).
http://www.chemteam.info/Redox/Redox.html
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