Which statement describes a chemical property of water?

• A. Water is colorless and odorless.
• B. Water has a density of 1.0 g/cm^3 at 4^ext{o}C.
• C. Water freezes at 0^ext{o}C.
• D. Water reacts with sodium to produce hydrogen gas.

Answer: (D)

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 statement to determine if it describes a physical or chemical property:
3. - "Water is colorless and odorless" describes observable characteristics without changing water's identity, so it is a physical property.
4. - "Water has a density of 1.0 g/cm^3 at 4^\text{o}C" is a measurable physical property related to mass and volume.
5. - "Water freezes at 0^\text{o}C" describes a phase change, which is a physical change, so this is a physical property.
6. - "Water reacts with sodium to produce hydrogen gas" describes a chemical reaction where water changes into new substances, indicating a chemical property.