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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.
Physical changes affect the state of an item, and a chemical change happens at a molecular level. Chemical changes involve atomic bonds being created or broken during chemical reactions. When iron rusts because it is exposed to the oxygen, that is a chemical change. In this instance, the molecules change their structure and become iron oxide.