The reactants along with the oxidation states are: Zn = 0 CuSO4: Cu = +2, S = +6, O = -2 The products along with the oxidation states are: Cu = 0 ZnSO4: Zn = +2, S= +6, O=-2 Zn went from 0 to +2 i.e. it lost electrons so it was Oxidized Cu went from +2 to 0 i.e. it gained electrons so it was Reduced. Solution The reactants along with the oxidation states are: Zn = 0 CuSO4: Cu = +2, S = +6, O = -2 The products along with the oxidation states are: Cu = 0 ZnSO4: Zn = +2, S= +6, O=-2 Zn went from 0 to +2 i.e. it lost electrons so it was Oxidized Cu went from +2 to 0 i.e. it gained electrons so it was Reduced..