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Burning of magnesium ribbon is a chemical change as chemical composition of one of the compound is changing and the chemical reaction associated with it is. Mg + (1/2) O2 â MgO. here the magnesium ribbon is burnt and magnesium oxide is formed.
No new substances are produced during a physical change. However, chemical changes always result in the formation of one or more new substances. The rusting of iron, during which the new substance iron (III) oxide forms from iron (Fe) and oxygen, (O2), is an example of a chemical change.