Section 11.6- Precious Metals Flashcards
metals that are valued for their appearance, durability, workability, and scarcity
precious metals
several rare metals in the periodic table are similar to platinum and are collectively known as the
platinum group
small amounts of gold may be separated from river sediments and other loose deposits by
panning or sluicing
gold and silver can be extracted from low-grade ores using the _____________
cyanide process
soft, yellow
most malleable and ductile metal known
Gold
the purity of gold is often expressed in
karats
a relatively soft, lustrous, and malleable metal that has long been used in coins and jewelry
silver
mercury alloy
is contains silver is still used in dentistry as fillings for teeth, since it can withstand the chemical reactions occurring in the partial digestion of food in the mouth
amalgam
precious used primarily as a catalyst in pollution-control devices and in the productions of petroleum products
platinum
most valuable precious metal
platinum
lesser-known precious metals that are used as industrial and automotive catalysts
palladium and rhodium
precious metal that is commonly alloyed with platinum to increase its corrosion resistance
iridium
the densest NATURALLY occurring element
osmium
used to determine purity of gold
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an alloy consisting of 92.5% silver and 7.5% copper
sterling silver
