* Physical Properties are characteristics of a substance that can be observed or measured without changing the substance's chemical composition. Examples include color, density, melting point, boiling point, and hardness.
* Chemical Properties describe how a substance reacts with other substances or how it changes its chemical composition. These properties are revealed through chemical reactions.
Rusting is a chemical reaction. Iron reacts with oxygen and water in the presence of air to form iron oxide (rust).
Therefore, the lack of ability to rust is a chemical property because it describes a substance's resistance to a specific chemical reaction (oxidation).
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