Which of the following statements describes a chemical property?

• A. Gold has a shiny, metallic luster.
• B. Ice melts at 0 ^\circ C.
• C. Iron reacts with oxygen to form rust.
• D. Copper is a good conductor of electricity.

Answer: (C)

Verified step by step guidance

1. Understand the difference between physical and chemical properties: Physical properties can be observed or measured without changing the substance's identity, while chemical properties describe a substance's ability to undergo a chemical change or reaction.
2. Analyze each statement to determine if it describes a physical or chemical property:
3. 1. "Gold has a shiny, metallic luster" describes an appearance, which is a physical property.
4. 2. "Ice melts at 0 ^\circ C" describes a phase change, which is a physical property.
5. 3. "Iron reacts with oxygen to form rust" describes a chemical reaction where iron changes into a new substance (rust), indicating a chemical property.
6. 4. "Copper is a good conductor of electricity" describes an electrical property, which is physical.