* Rust is a new compound: Rust is iron oxide (Fe₂O₃), a completely different chemical compound than pure iron (Fe). It has different properties like color, hardness, and reactivity.
* Chemical reaction: Rusting is a chemical reaction called oxidation. Iron reacts with oxygen and water in the presence of air to form iron oxide, or rust.
* Chemical bonds change: The atoms in iron are rearranged and new chemical bonds are formed when rust is created. This fundamentally alters the substance's chemical makeup.
So, in summary: Rusting is a clear example of a chemical change where the original iron undergoes a transformation into a new compound with distinct chemical properties.
