Which of the following is NOT a chemical change?

• A. Rusting of iron
• B. Melting of ice
• C. Digestion of food
• D. Burning of wood

Answer: (B)

Verified step by step guidance

1. Understand the difference between a chemical change and a physical change. A chemical change results in the formation of new substances with different properties, while a physical change affects the form or state of a substance without changing its chemical identity.
2. Analyze each option to determine if it involves a chemical change:
3. Rusting of iron involves iron reacting with oxygen to form iron oxide, which is a new substance, so it is a chemical change.
4. Digestion of food involves breaking down complex molecules into simpler ones through chemical reactions, so it is a chemical change.
5. Burning of wood involves combustion, producing new substances like carbon dioxide and ash, so it is a chemical change.
6. Melting of ice involves changing water from solid to liquid state without altering its chemical composition, so it is a physical change and NOT a chemical change.