What chemical property does iron exhibit when it reacts under specific conditions?

When iron reacts under specific conditions, it exhibits the chemical property of rusting, which is a form of corrosion. Rusting occurs when iron reacts with oxygen in the presence of moisture, forming iron oxide, commonly known as rust. This process is a fundamental example of a chemical change, as it involves the formation of a new substance (iron oxide) through a reaction with oxygen and water.

Unlike physical properties such as melting point or electrical conductivity, rusting is a clear indication of how iron can change its chemical identity in an environment conducive to oxidation. This is particularly important in contexts such as construction and manufacturing, where iron is often used, and measures must be taken to prevent rusting to maintain structural integrity and longevity.