1. Electrochemistry
Electrolysis

2. Complete Galvanic Cell

3. Electrolysis-requires energy
Electrolysis with Active Electrodes

4. Electrochemical cells
galvanic cell – spontaneous chemical reaction produces an electric current
Electrolytic cell – electric current drives a nonspontaneous reaction
Redox reactions involve a transfer of electrons.
Zn(s) + CuCl2(aq) g ZnCl2(aq) + Cu(s)
Zn(s) + Cu2+(aq) g Zn2+(aq) + Cu(s)

5. Galvanic vs Electrolytic

6. Electrolysis
Process that involves forcing a current through a cell to produce a chemical change for which the cell potential is negative.
Electrolytic cells
Electron flow is reversed from galvanic
Anode and cathode are reversed from galvanic

7. Electroplating
How much chemical change occurs with the flow of a given current for a specified time?
Current is measured in amperes (A).
1 A = 1 C/s

8. Another Question For You
What mass of Cu is plated out when a current of 10.0 A is passed for 30.0 min through a solution containing Cu2+?
Cu2+ + 2e-  Cu
30.0 min  (60 s / 1 min) = 1800 s
1800 s  (10.0 C/ 1 s) = 18,000 C
18,000 C  (1 mol e- / 96,485 C) = mol e-
0.187mol e-  (1mol Cu / 2mol e-) = 0.094mol Cu
0.094 mol Cu  ( g /1 mol Cu) = 5.94 g Cu

9. multimeter
ring stand
clamp
inverted buret