Which of the following metals is commonly alloyed with copper to make brass?

Analysis

The question asks for the specific metal that, when combined with copper, forms the alloy known as brass.

Concept Explanation

An alloy is a homogeneous mixture of two or more elements, at least one of which is a metal. Alloys are created to improve the properties of pure metals, such as increasing hardness, preventing corrosion, or improving aesthetic appearance.

• Brass is a well-known binary alloy consisting primarily of copper and zinc.
• Bronze, by contrast, is an alloy of copper and tin.
• Cupronickel is an alloy of copper and nickel.

By understanding the composition of these common copper-based alloys, you can easily distinguish between them in exam scenarios.

Step-by-Step Solution

1. Identify the components of Brass: Brass is defined in chemistry as an alloy of copper (Cu) and zinc (Zn).
2. Evaluate the options: • A. Iron: Copper and iron do not form brass. • B. Nickel: Copper and nickel form cupronickel. • C. Aluminum: Copper and aluminum form aluminum bronze. • D. Zinc: Copper and zinc form brass.
3. Conclusion: Since brass is specifically defined as a copper-zinc alloy, option D is the correct component.

Exam Tip

To avoid mixing up these common alloys, use this simple mnemonic:

• Brass = Cu + Zn (Think "Brass has a Zinc-y sound").
• Bronze = Cu + Sn (Think "Bronze has a Tin-y sound").