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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.
A chemical change is âto change chemical properties of a materialâ which includes the reactivity with various species. The new species so formed has different reactive characteristics than initial species. Whereas a chemical reaction is the âbreaking down of bonds, or formation of bonds or bothâ, sequentially or simultaneously.