Redox reaction is a reactions involving transfer of electrons between two systems such that both reduction and oxidation occurs. Reduction is the gain of electrons while oxidation is the loss of electrons. In this case, if we write half balanced equations Zn (s) = Zn 2+(aq) + 2e (oxidation) 2O 2- (aq) + 4e = O2 (g) (reduction) therefore combining the two equations 2Zn (s) + 2O 2- (aq) = 2Zn 2+ (aq) + O2 (g) ( balanced equation)
