Question

Why is 18-karat gold considered a mixture rather than a pure substance? A) It has a variable composition. B) Its color is different than pure gold. C) The gold atoms are not arranged in a repeating pattern. D) It can be melted and transformed into a different substance.

Answer 1

a) bcz it is not pure gold and is a mixture os some other metals..
thats the reason its cheaper than 24 karat gold

Answer 2

Answer:

The correct option is option A.

Explanation:

18-karat gold is not a pure substance because it is composed of a variable composition, so 18-karat gold is a mixture. The composition of 18 karat is not pure gold but a mixture of gold and some other metals. Since it is not pure gold hence it is cheaper than 24 karat gold. The purity of gold is given in karats. 24 karat gold is the pure gold while 18 karat gold is a mixture of gold the composition of other metals.