* Chemical Properties describe how a substance reacts with other substances. They involve changes in the composition of the substance. Examples include reactivity with acids, flammability, and ability to rust.
* Physical Properties describe the characteristics of a substance that can be observed without changing its chemical composition. Examples include color, density, melting point, and shininess.
Iron's shininess is a result of its smooth surface reflecting light. This is a physical property, not a chemical one.
While iron can rust, which is a chemical change, the rust (iron oxide) is not shiny. The shiny surface is a characteristic of pure iron.
