* Chemical Properties describe how a substance reacts or changes its chemical composition when interacting with other substances.

* Physical Properties can be observed or measured without changing the substance's chemical composition.

Displacing hydrogen from water involves a chemical reaction, where the original substance reacts with water (H₂O) to form new substances. This change in chemical composition is a hallmark of a chemical property.

Example:

* Sodium (Na) reacts vigorously with water, displacing hydrogen gas and forming sodium hydroxide (NaOH). This is a chemical reaction that demonstrates a chemical property of sodium.

Key takeaway: When a substance reacts with water to displace hydrogen, it's changing its chemical identity. This is a chemical property, not a physical one.