Final answer:
An alloy is a mixture of metallic elements that give the substance a new chemical identity. Brass is an example of an alloy made of copper and zinc.
Step-by-step explanation:
An alloy is a mixture composed of two or more elements, at least one of which is a metal. Alloys can give the substance a new chemical identity because they have different properties compared to the individual metals. For example, brass is an alloy of copper and zinc, and bronze is an alloy of copper and tin.