Which of the following processes represents a chemical change?

• A. Breaking a glass
• B. Rusting of iron
• C. Boiling of water
• D. Melting of ice

Answer: (B)

Verified step by step guidance

1. Understand the difference between physical and chemical changes: A physical change affects the form of a substance but not its chemical composition, while a chemical change results in the formation of one or more new substances with different properties.
2. Analyze each process given: Breaking a glass changes its shape but the chemical composition of the glass remains the same, so it is a physical change.
3. Boiling of water involves changing water from liquid to gas phase, but the chemical identity of H\_2O remains unchanged, so it is a physical change.
4. Melting of ice changes solid water to liquid water, which is a phase change without altering the chemical composition, so it is a physical change.
5. Rusting of iron involves iron reacting with oxygen and moisture to form iron oxide, a new substance with different properties, indicating a chemical change.