In each of the following reactions, identify the atom oxidized, the atom reduced, and balance the equation.
1. KBr + Fe2(SO4)3 -> Br2 + K2SO4 + FeSO4
2. Sn + HNO3 + H2O -> H2SnO3 + NO
3. Cu + AgNO3 -> Ag + Cu(NO3)2
Calculate the cell potential for each of the following reactions and determine whether the reaction is spontaneous.
4. Cr+3 + 3Na -> Cr +3Na+
5. Mn+2 + Cd -> Mn + Cd+2