Which of the following is a chemical change caused by light from a light bulb?

• A. Melting of wax in a candle
• B. Evaporation of water from a surface
• C. Condensation of water vapor on a cold window
• D. Photosynthesis in a plant leaf

Answer: (D)

Verified step by step guidance

1. Understand the difference between physical and chemical changes: Physical changes affect the form of a substance but not its chemical composition, while chemical changes result in the formation of new substances with different chemical properties.
2. Analyze each option to determine if it involves a chemical change: Melting of wax is a physical change because the wax changes from solid to liquid without altering its chemical structure.
3. Evaporation of water is also a physical change since water changes from liquid to gas but remains chemically H\_2O.
4. Condensation of water vapor is a physical change where water vapor turns back into liquid water without changing its chemical identity.
5. Photosynthesis in a plant leaf is a chemical change caused by light because it involves converting carbon dioxide and water into glucose and oxygen, creating new chemical substances through a light-driven reaction.