Which of the following is considered a physical property?

• A. Reactivity with acid
• B. Ability to rust
• C. Boiling point
• D. Flammability

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 how a substance interacts with other substances, resulting in a chemical change.
2. Analyze each option to determine if it involves a chemical change or not:
3. Reactivity with acid involves a chemical reaction, so it is a chemical property.
4. Ability to rust is a chemical property because rusting is a chemical change involving oxidation.
5. Boiling point is a physical property because it describes the temperature at which a substance changes from liquid to gas without changing its chemical identity.
6. Flammability is a chemical property because it describes the ability of a substance to undergo combustion, a chemical reaction.