Which of the following is a physical property that can be measured?

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

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 or changes into a new substance.
2. Analyze each option to determine if it involves a change in the substance's chemical identity or not.
3. Flammability involves burning, which changes the substance chemically, so it is a chemical property.
4. Ability to rust involves a chemical reaction (oxidation), so it is a chemical property.
5. Density is a measure of mass per unit volume and can be measured without changing the substance's identity, so it is a physical property.
6. Reactivity with acids involves a chemical reaction, so it is a chemical property.