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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.
In nuclear reactions elements do change. Lead has been changed into gold. (Reaction (3) shows the production of a carbon-13 nucleus. Later that nucleus will gather to itself 6 electrons and become a carbon atom.