Metals. ESO 3
Name:______Group:______
METALS
Write 5 properties of metals in general.
1. What is the difference between ferrous metals and non-ferrous metals?
2. What is the name of the iron alloy which carbon concentration varies from 0.03% to 1.76%?
3. List at least eight non-ferrous metals classifying them according to their density.
4. Write the most important characteristics of copper and how it is used in industry
5. Write five objects made of aluminium.
6. Write the name of the metal that the following objects are made of.
a) wrench.
b) ring.
c) rain cover.
d) can of soda.
7. Complete the following sentences:
a) Brass is an alloy of ______and ______.
b) The alloy of copper and ______produces bronze.
c) Tin is produced using ______and ______.
d) The process of coating steel with a light coat of zinc is called ______.
8. Classify the following materials according to their hardness.
Iron, steel, cast iron
9. Write one main property of the following non-ferrous metals and one product that can be manufactured with such metals:
Aluminium, copper, tin, zinc, brass, bronze.
10. Make a simple scheme with the process followed by the iron to become steel.
11. Explain the difference between hardness and toughness.
12. What is a brittle material?
13. Explain why copper it is said to be a ductile and malleable material.
1. What is brass?
a. An alloy of copper and zinc
b. An alloy of copper and nickel
c. An alloy of copper and tin
2. What is steel?
a. An alloy of iron and carbon
b. An alloy of iron and chromium
c. An alloy of iron and tin
3. Which of the following metals is lighter?
a. Aluminium
b. Copper
c. Steel
4. Which of the following is used to make stainless steel?
a. Tin
b. Copper
c. Nickel
5. What is the function of the metal industry?
a. Obtaining copper and aluminium
b. Obtaining all metals
c. Obtaining iron and its derivatives
6. What is brass?
a. An alloy of copper and tin
b. An alloy of copper and nickel
c. An alloy of copper and zinc
7. What properties have cast iron?
a. They are soft and fragile
b. They are hard and brittle
c. They are hard and tough
8. What do we call the mixture of two or more metals?
a. Ore
b. Alloy
c. Bargain
9. What is the bargain of a mineral?
a. The non-metallic ore
b. The metal parts of the ore
c. The hardest part of the ore
10. What is the metal most used by man?
a. Copper
b. Aluminum
c. Iron
11. Which of the following materials is the best conductor of electricity?
a. Aluminum
b. Copper
c. Tin
12. What are ferrous materials?
d. The iron and their alloys
e. Copper and its alloys
f. Aluminium and its alloys
13. Most metals are ...
a. In nature, forming minerals that may be located on the inside surface earth.
b. In the factory, where they are produced from junk cars..
c. It is found in nature in its purest form.
14. The metals are denser than other materials. This means that ...
a. That can be worked more easily than other materials.
b. They are lighter and weigh less than other materials.
c. That having the same volume, metals are heavier than other materials.
15. Metals have high mechanical strength. This means that ...
a. They are difficult to work in the machine shops.
b. Support great efforts, pressure and shock.
c. Not conduct electricity well.
16. Metals are very hard. This means that ...
a. No scratch easily, so they are very resistant to wear and used to make tools.
b. When you hit them do not break.
c. Do not bend or twist easily.
17. Metals are conductors of heat and electricity. Thanks to this property:
a. We used to make cables and kitchen appliances
b. Heat and electricity are shared and we do not burn..
c. They are very suitable for building objects that have to withstand high temperatures.
18. Alloys used to ...
a. Metals look better and they will not rust.
b. Using less metal materials as part of the product is another material.
c. Vary some properties of metals.
19. Pure iron has no use for being very brittle. To improve it, iron is alloyed, What do we obtain?
a. Stainless irons.
b. Brasses and bronzes.
c. Steels and cast iron.
20. The iron is alloyed with carbon in different proportions ...
a. With less than 1.7% steel is obtained..
b. The more carbon carries the heavier iron.
c. Should take more than 10% carbon..
21. Special steels ...
a. Are mixed with chromium and nickel to become steel.
b. They are much carbon steels, which gives heat resistance.
c. Steels are mixed with excess iron to be cheaper.
METALS 2.
1. Write five general properties of metals.
2. Based on what property we can say, in general, metals are heavy.
3. Why do we say that metals are ductile and malleable?
4. What is an alloy?
5. Based on what criteria are classified metals.
6. What is the main difference between Non-ferrous and ferrous metals?
7. Why carbon is added to iron? What is the name of the alloys obtained?
8. What chemical element is added to steel to improve its resistance to oxidation?
9 Write two properties and two applications of the following pure non-ferrous metals: copper, tin, zinc and aluminium.
10. Write what pure metals or alloy is good to build the following objects:
a. legs of a chair of a spaceship
b. femur implant
c. wing of an airplane
d. an elevator cable
e. container to molten copper.
11. What metal are we talking about?
a. Light weight, very resistant and used in pyrotechnics
b. red, widely used in electrical and heating
c. highly resistant to corrosion, used in aviation
d. Soft and used in metallic drink cans.
12. What material is the sink of your kitchen made?
13. The high-voltage electric wires are made of steel and aluminium, but copper conducts electricity better than both. How do you explain this?
14. Explain that two things we can all do to reduce the environmental impact due to the use of metals.