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Why is rusting of iron considered as a chemical change?

chemical iron Rusting
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Why is rusting of iron considered as a chemical change?

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Rusting of iron is a chemical change because 1) A new substance iron oxide is formed. 2) The change is permanent; the article has got a rust layer (which may only peal off). 3) There is an increase in mass when rust forms. 4) An energy change has taken place (which may not be visible).

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