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

• A. Boiling water
• B. Frying an egg
• C. Chopping onions
• D. Melting butter

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 to determine if it involves a change in chemical composition:
3. Boiling water is a physical change because it changes water from liquid to gas without altering its chemical structure (H\_2O remains H\_2O).
4. Chopping onions and melting butter are physical changes because they only change the shape or state of the substance without creating new substances.
5. Frying an egg is a chemical change because heat causes proteins in the egg to denature and form new chemical bonds, resulting in new substances and irreversible changes.