why is rusting consider to be a chemical change.explain with the help of a chemical reaction
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A change in which one or more new substances are formed is known as chemical change. For Example, when the iron is exposed to air and moisture, rust formation takes place. Rust is nothing but Iron Oxide; a new substance formed out of the reaction. ... Hence, rusting of iron is a chemical change.
4Fe+ 3O2 → 2Fe2O
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Iron comes into contact with the wetness (humidity) in air and gets oxidized.
A thin layer of Iron oxide is formed on the surface. That is in brown. It is not possible to get back Iron from Iron oxide, by using normal physical means of heating, filtering etc. So it is a chemical change.
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