1. A AlCl3 melt is electrolyzed to Al using a current of 0.63 amp. How much time would it take to plate out 3.4 grams of Al?
2. Sketch a construction of a electrolysis cell to carry out the electrolysis in #1. Identify the positive and negative electrodes.Indicate the direction of flow of the electrons and ions.
3. a) What is the chemical reaction that forms the basis of the lead storage battery? b) What are its advantages and disadvantages?
4. What is the minimum weight of lead needed in a lead storage battery to produce 1 kw-hour of electricity. 1 kw-hr = 1000voltsx1Coulombx3600 seconds = 3.6x106 Joules
(answer about 3.8 kg or 8.4 pounds of Pb, 1/2 in
form of
Pb and 1/2 in form of PbO2)
5. Describe in some detail one commercial
electrochemical
process. (Making of NaOH and Cl2
or the chemistry of a flashlight battery.)
6. What current would be needed to produce 50 mL
of H2 and 25 mL of O2 in 1 hour of electrolysis of H2O?