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PRECIOUS METALS




АWhen Christopher Columbus discovered the Americans in 1492, Spanish expeditions soon followed, and though they are much criticised for their cruelty, greed and treachery, the military achievements of the 'Conquistadors' were remarkable. First they conquered Mexico and took away its valuable treasures. Seeking more land and wealth they invaded Peru, home of the Incas. Here they murdered the king and stole his vast hoard of gold - probably the greatest in the world. The natives were enslaved and set to work to win more gold. Later the Spanish conquered Chile and Bolivia, both of these countries being rich in precious metals, particularly silver.
 
BTo the metallurgists, the most exciting discovery made by the Spaniards was the finding of platinum in the silver mines of Mexico. At that time the new metal was regarded as more of a nuisance than of value. It could not be melted by any known method, though it was possible to make a very realistic imitation of gold from it. Later it joined the group of precious metals and is now used for jewelry and in industry.
 
CGold is the most malleable of all the metals. It can be hammered into sheets so thin that 250 of them would equal the thickness of a sheet of paper. It is also the most ductile metal. One gram of gold can be drawn into a wire 1.8 miles in length. Gold is the least chemically active of all metals and does not combine with oxygen to form rust. This ability to resist corrosion makes it very durable, i.e. it may last for centuries. Pure gold is too soft to be used in jewelry so it is usually alloyed with other metals. The proportion of gold in an alloy is measured in karats. Pure gold is 24 karats. A 14 karat gold ring is an alloy of about 58% of gold and small percentages of copper and silver.
 
DSilver is similar to gold in many ways. Like gold, it is very malleable and ductile and so it is also used for jewelry. Silver differs from gold in that it is more reactive and tarnished when exposed to the traces of sulfur in the air. Pure silver is too soft and so it is usually alloyed with copper to increase its hardness and durability. Silver is used for coins and for photographic film because certain com­pounds of silver, such as silver bromide, reflect light. Silver is the best conductor of electricity known.

1) В каком абзаце текста (A-C) рассказывается о:

1. самом мягком металле?

2. самом лучшем проводнике?

3. необходимом компоненте для получения фотографий?

4. находке нового металла?

5. открытии, повлекшем смерть людей?







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