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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.
Whether it is combustion in the engine of a car or on the stove, combustion requires a chemical change. In these cases, it is a hydrocarbon (compound made from carbon and hydrogen atoms) that is combining with oxygen to form carbon dioxide and water.atching sugar burn allow you to witness hundreds of types of chemical reactions in a matter of seconds. The physical change you noticed is when the sugar reached its melting point (which is a physical property). Then the color change indicates a chemical reaction.