Hand in when entering the lab. No admittance without a completed PreLab.

1. What is the purpose of this experiment? __________________________________________________________ __________________________________________________________________________________________
2. Why were pennies changed from all copper to copper plated zinc?_____________________________________ __________________________________________________________________________________________
3. What physical property of the penny changed as a result? ____________________________________________
4. When is a penny worth more than one cent?_______________________________________________________ __________________________________________________________________________________________
5. What is the purpose of the second larger iron ring? _________________________________________________
6. What is the purpose of the watch glass? _________________________________________________________
7. How much zinc will you use? __________________________________________________________________
8. What is the hazard associated with zinc chloride solution? ___________________________________________
9. What should you do if you get zinc chloride solution on you? _________________________________________
10. Why is one penny not put in the zinc-zinc chloride mixture? __________________________________________
11. How long should you heat treated coins? _________________________________________________________
12. Why use forceps or tongs to put the pennies into the zinc-zinc chloride mixture? _________________________
13. What is the Law of Conservation of Matter? ______________________________________________________ __________________________________________________________________________________________
14. What is a mixture of copper and zinc called? ______________________________________________________

Questioins? Comments??
Ted Richardson, Toledo Technology Academy