3 .Metals
1. Discuss the following questions.
a) What metals do you know?
b) How much do you know about copper?
c) Where is copper used today? Make a list of possible applications of copper. Compare it with that of your group-mates.
d) Do you know any copper alloys? What are their constituents?
2. The students are at the seminar on metals technology. Listen to their discussion and learn what properties copper has and where it can be used.
Teacher: Dear students, today we're going to discuss the main properties and applications of copper. So far, what can you say about this metal?
Andrew: If I'm not mistaken, copper is a non-ferrous metal. And it can be found in a free state in nature.
A
lice:
And
as far as I remember, people were able to extract
this
metal in prehistoric times. Various things such as weapons, tools
and decorations
could
be made of it.
Teacher: Very good. Were those copper tools very reliable?
Andrew: I think not. Pure copper is a soft ductile metal. Strong cutting tools could be made only of copper alloys such as bronze.
Teacher: OK. What are the present applications of copper?
Alice: Well, they are numerous. Copper metals can be used in most domestic appliances. Electrical industry is impossible without copper wiring as it is a very good conductor of electricity. Also, copper is corrosion resistant which makes it valuable for marine industry. Besides, this metal is even used in making money!
Teacher: You are quite right. Tomorrow we will be able to study the valuable properties of copper in the practical class.
3.Match a line in a with a line in b.
А В
1. Copper was discovered |
a. Yes, it is. |
long ago. |
b. Where exactly? |
2. Is copper used in automobile |
с. You are welcome. |
industry? |
d. You are quite right. |
3. Bronze was first produced |
e. Because of its valuable |
in Asia and Africa. |
properties. |
4. Why is copper so widely |
f. Certainly. |
used today? |
|
5. Electric wiring is made of |
|
pure copper, isn't it? |
|
6. Thank you very much. |
|
4. Use the table to complete the sentences.
FOR EXAMPLE: 1. Brass is an alloy whereas aluminium is a pure metal.
2. Brass and pewter are non-ferrous alloys whereas steel is a ferrous alloy.
1. Brass is an alloy _______ aluminium ….
2. Brass and pewter … whereas steel is ….
3. Brass and bronze _____ copper alloys … and … lead alloys.
4. Zinc ____ an element _____ pewter ….
5. Solder … whereas invar ….
6. Steel has less than 2% of carbon _____ cast iron ….