Which of these alloys contains copper?

1. Analyze the question

The question asks you to identify which of the listed alloys is composed of copper as one of its primary metallic components.

2. Explain the concept

An alloy is a mixture of two or more elements, where at least one of the elements is a metal. To answer this, we need to look at the composition of each option provided:

• Solder: Primarily composed of tin and lead. It is commonly used in electronics for joining components.
• Steel: Primarily composed of iron and carbon. It is a fundamental material in construction and engineering.
• Permalloy: Primarily composed of nickel and iron. It is known for its high magnetic permeability.
• Bronze: Primarily composed of copper and tin. It is a classic alloy used historically for tools, weapons, and statues.

3. Show the solution

Let’s break down the composition of each option:

• A. Solder: Sn (Tin) + Pb (Lead) — No copper.
• B. Steel: Fe (Iron) + C (Carbon) — No copper.
• C. Permalloy: Ni (Nickel) + Fe (Iron) — No copper.
• D. Bronze: Cu (Copper) + Sn (Tin) — Contains copper.

Since the question specifically asks for an alloy that contains copper, we can clearly see that Bronze is the correct choice.

4. Identify the answer

The correct option is D.

5. Exam Tip

To remember common alloys, use a simple mnemonic or grouping:

• Brass = Copper + Zinc (Think "C-Z")
• Bronze = Copper + Tin (Think "C-T")
• Solder = Lead + Tin (Think "L-T")

Always remember that "Bronze" and "Brass" both start with copper, but they differ by their second metal (Tin vs. Zinc).