Which of the following warnings refers to a chemical property of the material?

• A. Flammable: Keep away from open flames.
• B. Keep container tightly closed to prevent evaporation.
• C. Do not drop: Fragile.
• D. Store in a cool, dry place.

Answer: (A)

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, such as evaporation or fragility. Chemical properties describe a substance's ability to undergo chemical changes, like flammability.
2. Analyze each warning to determine if it describes a physical or chemical property:
3. - "Flammable: Keep away from open flames." refers to the substance's ability to catch fire, which is a chemical property because it involves a chemical reaction (combustion).
4. - "Keep container tightly closed to prevent evaporation." relates to evaporation, a physical change, so this is a physical property.
5. - "Do not drop: Fragile." describes the material's tendency to break, a physical property related to mechanical strength.
6. - "Store in a cool, dry place." is a storage instruction based on physical stability, not a chemical property.