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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.
Chemical reaction is a process of changing from one chemical state to another and chemical change is a change in the state of a material. For example, Iron when exposed to atmosphere becomes rust. Here, chemical reaction is called ârustingâ and the chemical change is âfrom iron to iron oxideâ.