Construct ionic half-equations for reactions at the anode (to show oxidation) and at the cathode (to show reduction)

Describe the use of a flame test to identify the cations: (a) lithium, Li^+ (b) sodium, Na^+ (c) potassium, K^+ (d) calcium, Ca^2+ (e) barium, Ba^2+ (f) copper(II), Cu^2+