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Iron rusts when it reacts with Oxygen. When iron reacts with oxygen, reddish-brown colored iron-oxides are formed. This is called rust Answer:
Iron can react with oxygen at many rates some cause red iron oxide (rust) others black iron oxides. Rusting is a slow process which is usually regarded as safe unless the rusting iron is essential for mechanical strength in a system. Iron burns in fireworks to create coloured flames. Steel wool (essentially iron fibers) can burn in air causing injury and igniting other materials. Iron burns when heated in an acetylene flame with excess oxygen resulting in molten iron spray. Iron burns violently in a pure oxygen atmosphere.
Aside: When iron "unburns" (rust changes back to iron in a thermite reaction) it can be very dangerous and destructive.
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Where does the oxygen come from that is reacting with a piece of burning iron?
When oxygen is reacting with iron it generally comes from the air, but it can also come from oxygen disolved into water. There are other ways it can occur but I do not know these. But unless it is in a vacuum, the oxygen comes from the surrounding environment like air or water.
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When metals react with oxygen they produce metal oxides. A common example would be that of Iron which in the presence of oxygen and water form rust (a mixture of metal oxides and metal hydroxides)
Where does the oxygen come from that is reacting with a piece of burning iron?
When oxygen is reacting with iron it generally comes from the air, but it can also come from oxygen disolved into water. There are other ways it can occur but I do not know these. But unless it is in a vacuum, the oxygen comes from the surrounding environment like air or water.
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