Question

9. Throughout history, gold has been treasured for its natural beauty and radiance. For this reason, many cultures have imagined gold to represent the sun. "Karatage' is the measurement of purity of gold alloyed with other metals, like copper. 24 karat is pure gold with no other metals; lower karatages contain less gold (see Table). The atomic radius of gold is 0.144 nm and the radius of copper is 0.128 nm. In 14 karat gold what kind of impurity is the copper? Parts of gold Number of karats 9K 10K 12K 14K 18K 22K 9/24 10/24 12/24 14/24 18/24 22/24 24/24 % of gold purity 37.5 41.7 50.0 58.3 75.0 91.7 99.9 24K

Answer 1

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