Three Penny Lab
Informal
Chemistry – Lab #6
Performance date: Friday, 3/27/2015
Due date: Monday, 3/30/2015
(2 pts. extra credit if received today)
Three Penny Lab
Chemistry – Lab #9
Physical Science – Lab #8
• Goggles and apron a must. Wipe up spills
immediately.
• The solution is mixed up for you already. If
your two pennies don’t get “coated” in a
reasonable amount of time, let me know.
• Leave crucible on the hot plate and DO NOT
let it boil. (Obnoxious fumes will be produced
if boiled.)
Safety and Cleanup
Goggles, Aprons, Tie back long hair, DON’T let
solution boil. Wipe up spills immediately.
Avoid: heat and chemical burns
Use metal tools (forceps) provided
Cleanup:
Wipe up counters with sponge
Throw all used paper towels away
Leave evaporating dish on hot plate
Turn down hot plate
***Rinse off forceps, glass rod, and beaker and
leave at your station.
Informal Report
• One cover sheet per group
• Per Person: (stapled with 3x5 card on top)
– One 3x5 card with name, period and 3 pennies
– Copper
Silver
Gold
• Attach: Completed questions #1- #15 on hand
out.
IX Discussion Section
1. What is an alloy?
2. Discuss the means by which the copper and
zinc atoms form an alloy.
3. What is unique about a metallic bond that
makes it completely different from all other
bond types?
4. How many valence electrons does copper
have? Zinc?
5. Why is the solution of zinc and sodium
hydroxide heated before the copper pennies
are added?
6. What are the chief characteristics of metals?
7. What is solubility? What factors effect
solubility?
8. What are the four characteristics of a metallic
bond?
9. What is the relative strength of the metallic
bond between zinc and copper (both
transition metals) in the formation of Bronze.
10. What special characteristics of zinc and copper
make it readily bond together to form brass?
11. What are the sizes of the atomic radii and ionic
radii of the metals involved?
12.What are the ionization energies of the metals
involved in the bond?
13.What are the electron affinities of the metals
involved in the bond?
14. What are the electronegativities of the metals
involved in the bond?
15. What do we know about the activity of these
two metals involved in the bond?