SCIENCE
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Chemical
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Endothermic
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Physical
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Tarnishing
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Detailed explanation-1: -Rust is the common name for a very common compound, iron oxide. Iron oxide, the chemical Fe2O3, is common because iron combines very readily with oxygen–so readily, in fact, that pure iron is only rarely found in nature.
Detailed explanation-2: -Rusting is an oxidation reaction. The iron reacts with water and oxygen to form hydrated iron(III) oxide, which we see as rust. Iron and steel rust when they come into contact with water and oxygen – both are needed for rusting to occur.
Detailed explanation-3: -You probably don’t think of your bicycle rusting after you leaving it out in the rain-but rust is indeed the result of a chemical reaction! A chemical reaction happens when one or more different substances is changed into something else.