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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.
The starting materials change into an entirely different substance or substances. This new substance has a different chemical composition than the starting materials. Examples of chemical changes would be the reaction of iron with air (rusting} or the reaction of a metal and acid. Certain observations will indicate that a chemical change has occurred. These are: *The reaction produced a change in temperature.