2015-05-13
428
cobalt - кобальт
tricobalt tetroxide - тетроксид трикобальта
ferromagnetic - ферромагнитный
Curie point - температура Кюри
deposit - месторождение
cobaltite - кобальтин, кобальтовый блеск
smaltite - смальтин
sulphide - сульфид
arsenide - арсенид
to reduce - восстанавливать
to alloy - сплавлять, легировать
alnico - альнико
anhydrous cobalt (II) chloride paper - индикаторная бумага, пропитанная безводным хлоридом кобальта (II)
heat-sensitive ink - термочувствительные чернила
stainless steel - нержавеющая сталь
strength - прочность
resistant - устойчивый
oxidation - окисление
oxidation state - степень окисления
to oxidize - окислять
phosphorus - фосфор
dilute mineral acids - разбавленные минеральные кислоты
tiles - черепица, кафель
pottery - керамика, гончарные изделия
turbine blade - лопатка турбины
cutting tool - режущий инструмент
amount - количество
precipitate - осадок
to convert - превращать, преобразовывать
mammal - млекопитающее
radioactive tracer - радиоактивный индикатор
cancer-treatment agent - агент (препарат), используемый при лечении рака
composition - состав
to dissolve - растворять
tungsten - вольфрам
|
|
|
chromium - хром
brittle - хрупкий
ignition - воспламенение, сжигание, зажигание, прокалывание
high-speed tools - высокоскоростные приборы
high-strength alloy - высокопрочный сплав
Exercise 2. Answer the following questions.
1. Where is cobalt present?
2. What uses of cobalt do you know?
3. What compounds does cobalt have? Give their main characteristics.
4. What elements does cobalt steel contain?
5. What is Cobalt (III)?
Exercise 3. Put questions to the bold-typed words.
1. Artificially produced cobalt-60 is an important radioactive tracer and cancer-treatment agent.
2. Small amounts of metallic cobalt are present in meteorites but it is usually extracted from the ore deposits.
3. Cobalt is oxidized by hot air and also reacts with carbon.
4. Cobalt (II) oxide forms tricobalt tetrooxide.
5. Cobalt (III) is produced by the ignition of cobalt nitrate.
6. On heating cobalt (III) readily forms Co3O4.
7. Cobalt ores are usually roasted to the oxide and then reduced with carbon.
8. Cobalt (III)is a black grey insoluble solid.
9.
10. Cobalt (II) oxide shape is cubic.
11. Alnico is a well-known magnetic alloy.
12. Cobalt steelcontains 14-20% of tungsten.
Exercise 4. Give the equivalents for the following words and make up sentences with them: amount, phosphorous, to reduce, reduction, to oxidize, oxidation, oxidation state, high-speed tools, cutting tools, pottery, cancer-treatment agent, potassium, turbine blade, tiles, mammals, to convert, brittle, strength, dilute, compound, radioactive tracer, stainless steel, smaltite, cobaltite, copper, to dissolve, tungsten.
Exercise 5. Match the beginnings of the sentences with the endings.
1. Cobalt (II) oxide is a a) make stainless steel.
2. Iron is also used to b) in high –speed tools.
3. Alnico is a c) pink solid.
4. This metal is produced d) a well-known magnetic alloy.
5. Stainless steel is used e) by the ignition of cobalt nitrate.
6. Tungsten often f) brittle.
7. Cobalt steel is very g) occurs naturally.
8. The metal h) contains 12%of cobalt.
9. Cobalt steel i) is oxidized by hot air.
10. This precipitate k) has a violet colour.
Exercise 6. Put the following words in the gaps: stainless steel, alnico, ferromagnetic, transition, brittle, to dissolve, oxidation state, glass, pottery, to contain, violet, hot air, tungsten, cutting tool, alloy.
1. … is a magnetic alloy.
2. This compound doesn’t … in water.
3. All little children should drink a lot of milk, because their bones are ….
4. He will remain the head of the government during … period.
5. All electrotechnical devices are made of ….
6. Cobalt is … metal.
7. … of this substance is very low.
|
|
|
8. Windows are made of ….
9. Pots and dishes are made of clay are called ….
10. Cobalt steel … 2% of vanadium.
11. This substance is oxidized in ….
12. … is used in making filaments for light bulbs.
13. … are made of high – strength alloys.
14. Bismuth is employed to make low-melting-point casting ….
15. Yesterday I bought the hat which was of a … colour.
Exercise 7. Put the words into the right order.
1.
2. Is / solid / a / grey / cobalt (III) / black / insoluble.
3. To make / steels / cobalt / is / and / that / resistant to / at / stainless / used / in / oxidation / high - strength / alloys / high temperatures / alloys / are.
4. Bluish / precipitate / the / potassium / to / hydroxide / cobalt (II) nitrate / gives / addition / a / violet / solution /of / of / the.
5. Brittle / somewhat / are /very /they / hard / but.
6. Tungsten / contains / cobalt steel / vanadium / and.
7. Is / artificially / cobalt -60 / used / cancer - treatment agent / produced / as / a.
8. Alnico /is / what?
9. Are / usually / cobalt ores / roasted / the / to / oxide.
10. Dissolves / strong / solutions / cobalt (III) oxide / acid / to / unstable / give / brown/ usually / in.
11. The / cobalt / of / what / properties / physical /are?
12. This / gives / the / solution / the / of / a / colour / precipitate /violet / addition.
13. Can / identify / the / substance / I / of / composition / how / the?
14. Differ / terbium / does / oxygen / from?
15. This / of / steel / very / is / brittle / type.
16. Is / cobalt / in / present / minerals.
17. Cobalt / associated / copper / with / as / is / arsenides.
