Which of the following describes a chemical property of water?

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

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 and changes its chemical composition.
2. Examine each option to determine if it describes a physical or chemical property:
3. - "Water freezes at 0^\text{o}C" describes a phase change, which is a physical property because the chemical identity of water remains the same.
4. - "Water is colorless and odorless" describes sensory characteristics, which are physical properties.
5. - "Water reacts with sodium to produce hydrogen gas" describes a chemical reaction where water changes chemically, indicating a chemical property.
6. - "Water has a density of 1.0 \text{ g/cm}^3 at 4^\text{o}C" is a physical property related to mass and volume.