1. CHEM GEMS: Redox Andy Cherkas Stouffville DSS 801 Hoover Park Drive
Stouffville ON
Canada L4A 0A4

2. Visible Dissolution of a Copper Anode During Electrolysis
Cu (s)  Cu+2 (aq) e-
Copper- citrate complex shows blue colour of dissolved copper ions.
[Benedict’s Solution for reducing sugar test.]

3. Can Rip
3 Cu+2 (aq) Al (s)  3 Cu (s) Al+3 (aq)
chloride or bromide present to penetrate the Al2O3 protective coating on the aluminium.

4. Separation of Reactants: Electrochemical Cell
Cu+2 (aq) e-  Cu (s)
Zn (s)  Zn+2 (aq) e-

5. Reversible Reaction? Peroxide as an Oxidizing Agent or Reducing Agent
Acidic Solution
8 H+ (aq) H2O2 (aq) + Cr2O7-2 (aq)  2 Cr+3 (aq) O2 (g) + 7 H2O (l)
Basic Solution
8 OH- (aq) H2O2 (aq) Cr+3 (aq)  Cr2O7-2 (aq) H2O (l)