Which process is an example of a chemical change?

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

Answer: (A)

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: Breaking a glass is a physical change because the glass is only physically broken into pieces, but its chemical composition remains the same.
3. Melting of ice is a physical change because ice changes from solid to liquid water, but the chemical formula H\_2O remains unchanged.
4. Boiling of water is also a physical change where liquid water turns into water vapor, but the chemical identity of H\_2O does not change.
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 chemical properties from pure iron.