* Physical properties can be observed or measured without changing the substance's chemical composition. Examples include color, density, melting point, and conductivity.
* Chemical properties describe how a substance reacts with other substances. Corrosion involves a chemical reaction between a metal and its environment, resulting in a change in the metal's composition.
In corrosion:
* The metal reacts with substances like oxygen, water, or acids.
* This reaction forms new compounds (like oxides or hydroxides) on the metal's surface.
* These compounds are different from the original metal and change its properties.
Therefore, corrosion is a chemical change, not a physical one.
