Can you change the substances formed on burning magnesium ribbon and paper back into their original states?
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This ash is called magnesium oxide which is an entirely new substance. So, the burning of magnesium ribbon is a chemical change
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Burning of magnesium ribbon in air is a chemical change because: It is an irreversible change, as after burning the ribbon cannot be unburnt. A new product is formed with new properties, i.e. MgO.
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