Which of the following is an example of a chemical change?

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

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 option: Boiling of water involves changing water from liquid to gas, which is a physical change because the chemical composition (H\_2O) remains the same.
3. Melting of ice is also a physical change because it changes the state from solid to liquid without altering the chemical identity of water.
4. Breaking a glass is a physical change because it changes the shape and size of the glass but does not change its chemical composition.
5. Rusting of iron is a chemical change because iron reacts with oxygen and moisture in the environment to form a new substance, iron oxide (rust), which has different properties from pure iron.