Rusting is a chemical change in which iron reacts with oxygen and moisture to form a new reddish-brown substance called rust., 1. Rust is a new substance formed from iron., 2. Rusting requires oxygen and moisture., 3. Rust has properties different from those of iron., 4. Rusting is a chemical change because a new substance is formed., Iron + Oxygen + Water → Rust, - Rust forming on iron nails., - Rust developing on bicycle chains., - Iron gates becoming reddish-brown., - Rust appearing on metal tools exposed to moisture., Why is rusting considered a chemical change?, Answer: Rusting is a chemical change because iron reacts with oxygen and moisture to form a new substance called rust.

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