Which of the following best describes a chemical property?

• A. The density of water
• B. The ability of iron to rust when exposed to oxygen
• C. The color of copper metal
• D. The melting point of ice

Answer: (B)

Verified step by step guidance

1. Understand that a chemical property describes a substance's ability to undergo a specific chemical change or reaction, resulting in a new substance.
2. Recognize that physical properties, such as density, color, and melting point, describe characteristics that can be observed or measured without changing the substance's identity.
3. Analyze each option: density of water, color of copper, and melting point of ice are physical properties because they do not involve a change in chemical composition.
4. Identify that the ability of iron to rust when exposed to oxygen involves a chemical reaction where iron reacts with oxygen to form a new compound (iron oxide), which is a chemical property.
5. Conclude that the best description of a chemical property among the options is the ability of iron to rust when exposed to oxygen.