Which of the following is considered a physical property of matter?

• A. Reactivity with acids
• B. Flammability
• C. Melting point
• D. Ability to rust

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. Review each option and classify it as physical or chemical: Reactivity with acids involves a chemical change, so it is a chemical property.
3. Flammability refers to the ability of a substance to burn, which is a chemical change, so it is a chemical property.
4. Melting point is the temperature at which a substance changes from solid to liquid without changing its chemical identity, so it is a physical property.
5. Ability to rust involves a chemical reaction with oxygen and moisture, so it is a chemical property.