1) Corrosion is an oxidation reaction that occurs when a metal reacts with oxygen or water, causing the metal atoms to lose electrons and form metal ions.
2) Rusting is the corrosion of iron, which requires water, oxygen, and iron to produce iron ions and hydroxide ions.
3) An experiment was conducted using iron nails attached to magnesium, bare, or attached to copper in a salt solution with an indicator that turns blue in the presence of iron ions to observe their different corrosion rates.
![During corrosion: ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Magnesium oxide 2MgO Mg 2+ + 2e -](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)