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Rust.
rust
Rust is one example.
Rust
Rust is a chemical compound, essentially an iron oxide.
There are various chemicals that make things rust and a good example is muriatic acid. Rust occurs when iron is oxidized.
For example sand in water, insects in milk, rust in beer.
Stainless steel is an example of a metal that is rust-proof. It contains chromium, which forms a protective layer on the surface of the metal that prevents it from rusting.
Rusting of iron is a common example of an oxidation reaction where iron reacts with oxygen in the presence of water to form iron oxide (rust).
Chemical change.
Rust on a car
rust is a chemical change for iron