1. BELLWORK Balance the following redox reaction using the “half-reaction” method HNO 2 + I -  NO + I 2 2e - + 2H + + 2 HNO 2  2 NO + 2H 2 O 2 I -  I 2 + 2e - 2H + + 2HNO 2 + 2I -  2NO + 2H 2 O + I 2

2. Electrochemical cells produce an electric current from redox reactions CAN ALSO BE CALLED A Voltaic cell Galvanic cell Battery

6. To make the Zinc half cell Add a strip of Zinc metal to a solution containing Zn 2+ 1M ZnSO 4 Zn(s) Zinc metal

7. To make the copper half cell Add a strip of copper metal to a solution containing Cu 2+ 1M CuSO 4 Cu(s) Copper metal

10. When a wire connects the half cells an electrical current is created. This can’t occur for long because positive charge will build up at the anode and negative charge will build up at the cathode A salt bridge is used to keep the two cell compartments neutral

14. Describe the voltaic cell represented as: Al (s) | Al 2 (SO 4 ) 3 (aq) || NiSO 4 (aq) | Ni (s)