Activity 3.4: Physical Behavior of Metals (page 201)
Name:
What Do You See? ______________________________________________________________________________
What Do You Think? How can the physical properties of metals be modified? ___________________________________
__________________________________________________________________________________________________
What properties of metals make them useful as works of art or tools for creating art? ____________________________
__________________________________________________________________________________________________
Part A: Making Brass – We did this part when we made brass pennies! Proceed to Part B.
Part B: Properties of Steel - Find your instructions on page 202 – How are you going to change
the properties of iron? _________________________________________________________
1. Table
“Spring” Steel
Annealed Steel
Hardened Steel
Tempered Steel
2. What special kind of steel are bobby pins made of? ________________ What is steel? ___________________
follow the procedure for 2 and record above:
3. Follow Procedure
4. Follow Procedure
a. Was it easier or difficult when it’s hot?________________________________________
5. Follow Procedure
6. Follow Procedure
What is annealing? _______________________________________________________ What
does heating of the bobby pin do the iron-crystal structure? _________________________________
Where does
the carbon come from? ________________________________________________________________________
a. Come and contrast the annealed steel with the original spring steel:_____________________________________
_____________________________________________________________________________________________
b. Would annealed steel be useful for tools? Why or why not?____________________________________________
7. Follow Procedure
8. Follow Procedure
a. Observations: __________________________________________________________
b. Explain your observations:_____________________________ ________________________________________
What is hardening? _____________________________________________________________________________
What did the hardening do to the malleability of the metal? ____________________________________________
c. Would hardened steel be useful for tools? Why or why not?__________________________________________
9. Follow Procedure a. What type of steel have you made again?__________________________________________
10. Follow Procedure a. What type do you have now?________________________________________
11. What does it mean to temper steel? ______________________________________________________________
12. Follow Procedure
13. Follow Procedure
a. Describe the properties of this steel:____________________________________________
b. Is tempered steel safe for making tools? Explain:_________ ________________________________________
14. Turn off your burner, wipe debris from your station. Throw the used bobby pins in the trash and leave unused ones
on the station.
ALLOYS and their PROPERTIES: Begin on page 204.
1.
What is the electron-sea model? _______________________________________
2. Define cation: ________________________________________________________
3. Explain what makes metals malleable: _______________________________________
___________________________________________________________________
4. Define alloy: _________________________________________________________
5. Do the properties of the metal change when other metals are added to make an alloy? ____
6. How long ago were blades and cutting tools 1st made? ______________ What was one of
the earliest alloys made by humans? ____________ It’s a mixture of _______ and _____
7. How is brass better than just pure Cu? _____________________________________
8. What metal was eventually used that made tremendous changes in human culture? ______
9. You used three processes to alter the arrangement of Fe and C atoms. Describe each
process and what it does to the steel structure below:
Process
Description of how it’s performed:
What structural effect does it have?
annealed
hardened
tempered
10. What does 24karat Au mean? ____________ Why is it not usually used? _____________
11. What is brass? ________________________What does Si do to it? _______________
12. What is bronze? ___________________ Why is it preferred over brass?____________
13. What are SMAs? _______________________________________________________
What are they used for? _________________________________________________
14. What does Krahenbuhl do? _______________________________________________