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Chapter 12: Problem 47

Which element or elements are alloyed with gold to make the following types of "colored gold" used in the jewelry industry? For each type, also indicate what type of alloy is formed: (a) white gold, (b) rose gold, (c) green gold.

Short Answer

Expert verified
White gold is an alloy of gold and white metals like nickel, forming a substitutional alloy. Rose gold is an alloy of gold and copper, also forming a substitutional alloy. Green gold is an alloy of gold and silver, resulting in a substitutional alloy.

Step by step solution

01

White Gold

White gold is an alloy of gold and at least one white metal, typically either nickel, manganese, or palladium. Sometimes, other metals like silver or zinc can also be added to adjust color and properties. To make white gold, gold is usually alloyed with nickel, which is a strong, hard, and silvery-white metal.
02

Step 1a: Type of Alloy for White Gold

White gold is a substitutional alloy, which means that the atoms of the different metals are mixed together in the crystal lattice, substituting each other's places randomly.
03

Rose Gold

Rose gold, also known as pink or red gold, is an alloy of gold and copper. The presence of copper gives it a reddish color. The addition of other metals like silver may be used to adjust the shade of the rose gold.
04

Step 2a: Type of Alloy for Rose Gold

Like white gold, rose gold is a substitutional alloy. The atoms of copper and gold are mixed together in the crystal lattice and randomly substitute each other's places.
05

Green Gold

Green gold, also known as electrum, is an alloy of gold and silver. The presence of silver gives it a greenish color. The ratio between gold and silver can vary, with a higher silver content resulting in a more pronounced green color.
06

Step 3a: Type of Alloy for Green Gold

Green gold is also a substitutional alloy. The atoms of gold and silver are mixed together in the crystal lattice and substitute each other's places randomly. In summary: - White gold is an alloy of gold and nickel (or other white metals) and forms a substitutional alloy. - Rose gold is an alloy of gold and copper and forms a substitutional alloy. - Green gold is an alloy of gold and silver and forms a substitutional alloy.

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