Sterling silver contains 92.5% silver and 7.5% copper by weight. Which term applies to sterling silver?

Sterling silver is an alloy, i.e., a solid solution composed of a solid solute (copper) dissolved in a solid solvent (silver).

A chemical compound is a single substance consisting of atoms of more than one element joined by chemical bonds.

An emulsion is a temporarily stable mixture of two or more mutually immiscible liquids, e.g., oil and water. When shaken, a mixture of oil and water breaks up into small droplets that become dispersed to create an emulsion.