Explain that both air and water are needed for iron to rust. (Chemistry only)

In the subtopic Corrosion and its prevention, this learning objective focuses on explain that both air and water are needed for iron to rust. (Chemistry only). Within Using materials, students should explain this idea in the exact curriculum context rather than as an isolated fact. Approved keywords for this objective include chemistry only, iron, air, and water. rusting means the corrosion of iron caused by the reaction with oxygen and water. Avoid students often think that only one of air or water is needed for iron to rust, believing that either can be sufficient on its own; instead emphasize that both air and water are essential for the rusting process to occur, as they work together to facilitate the chemical reactions that lead to corrosion. For exam answers, remember that both air and water are essential for rusting to occur. In your answers, clearly state how each component contributes to the rusting process.