Методические указания и контрольное задание №5 по английскому языку для студентов заочного факультета специальностей 170600, 170700, 120100, 120200. Доржиева Г.Б - 22 стр.

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But in 1844 this metal or metallic element was rediscovered by
Rose. And because it looked like tantalum it was named niobium
after Niobe, the daughter of Tantalus, and the mythological
goddess of tears.
But the new name (niobium) was not immediately accepted.
And only after more than 100 years of controversy, was adopted
by the International Union of Pure and Applied Chemistry in
1960.
Today American scientists refer to the metal as niobium. But,
most American metallurgists and producers of the metal use the
name columbium.
For many years niobium was not only useless, but it was, in fact, a
nuisance. Chemists looked upon it as an impurity in the ores of
important metals.
In recent years metallurgists discovered that niobium was an
excellent alloy for strengthening many kinds of steel, and that in
resistance to heat and corrosion it was a miracle-metal.
Now niobium is beginning to be used in making synthetic silk,
as well as in aircraft industry.
But since it is still a rare metal its uses are limited.
Is it found in many parts of the world? Not at all. Deposits of
columbite, its ore, are worked in Australia, Africa (Nigeria and
Congo- Kinshasa), in the Kola peninsula Canada, Brazil and
Norway.
2. Scan the text for information that answers the questions below:
1. How many years did it take to scientists to recognize
columbite as a chemical element?
2. Why is this chemical element called niobium or
Columbium?
3. Why is niobium considered to be a miracle metal?
4. In what industries is niobium used?
5. What parts of the world is niobium found? (look at the
map)
3. Match the following words and definitions:
a. ore 1. a quarrel
b. deposit 2. free from anything that contaminates.
c. controversy 3. making stronger
d. pure 4. a place where ore is in great quantity.
e. strengthening 5. a mixture with another substance
f. miracle 6.a natural underground substance.
g. impurity 7. supernatural happening regarded as
an act of God.
4. Arrange the following sentences according to the text.
1. Niobium is referred to metals by American scientists.
2. Niobium or Columbium was named after Christopher
Columbus.
3. This alloy strengthens steel and makes metals rust-proof.
4. Deposits of niobium ore are limited.
5. American metallurgists used two names for this chemical
element.
5. Discuss with your partner:
1. What is the specific gravity of niobium?
2. Why do metallurgists consider niobium an excellent
alloy? 
   But in 1844 this metal or metallic element was rediscovered by
Rose. And because it looked like tantalum it was named niobium
after Niobe, the daughter of Tantalus, and the mythological           3. Match the following words and definitions:
goddess of tears.
  But the new name (niobium) was not immediately accepted.            a. ore             1. a quarrel
And only after more than 100 years of controversy, was adopted        b. deposit         2. free from anything that contaminates.
by the International Union of Pure and Applied Chemistry in           c. controversy     3. making stronger
1960.                                                                 d. pure            4. a place where ore is in great quantity.
   Today American scientists refer to the metal as niobium. But,      e. strengthening   5. a mixture with another substance
most American metallurgists and producers of the metal use the        f. miracle          6.a natural underground substance.
name columbium.                                                       g. impurity         7. supernatural happening regarded as
For many years niobium was not only useless, but it was, in fact, a                         an act of God.
nuisance. Chemists looked upon it as an impurity in the ores of
important metals.                                                      4. Arrange the following sentences according to the text.
In recent years metallurgists discovered that niobium was an
excellent alloy for strengthening many kinds of steel, and that in    1. Niobium is referred to metals by American scientists.
resistance to heat and corrosion it was a miracle-metal.              2. Niobium or Columbium was named after Christopher
   Now niobium is beginning to be used in making synthetic silk,        Columbus.
as well as in aircraft industry.                                      3. This alloy strengthens steel and makes metals rust-proof.
   But since it is still a rare metal its uses are limited.           4. Deposits of niobium ore are limited.
   Is it found in many parts of the world? Not at all. Deposits of    5. American metallurgists used two names for this chemical
columbite, its ore, are worked in Australia, Africa (Nigeria and      element.
Congo- Kinshasa), in the Kola peninsula Canada, Brazil and
Norway.                                                                5. Discuss with your partner:

2. Scan the text for information that answers the questions below:    1. What is the specific gravity of niobium?
                                                                      2. Why do metallurgists consider niobium an excellent
   1. How many years did it take to scientists to recognize           alloy?
      columbite as a chemical element?
   2. Why is this chemical element called niobium or
      Columbium?
   3. Why is niobium considered to be a miracle metal?
   4. In what industries is niobium used?
   5. What parts of the world is niobium found? (look at the
      map)

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