The document provides information on topics related to rusting and corrosion of iron for CXC exams, including: - Rusting is the oxidation of iron in the presence of oxygen and water to form hydrated iron(III) oxide. Only iron and alloys containing iron rust. - Methods for preventing rust include using protective coatings like paint and grease, attaching a more reactive sacrificial metal like zinc, and creating rust-resistant alloys like stainless steel. - Recycling metals has economic, social, and environmental benefits like reducing costs and waste, conserving resources, and decreasing pollution from metal extraction. However, recycling also has expenses and implementation challenges.