Identify the products formed at the electrodes and describe the observations made during the electrolysis of aqueous copper(II) sulfate using inert carbon/graphite electrodes and when using copper electrodes

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+} )