Q. 1. Why should a magnesium ribbon be cleaned before burning in air?
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Magnesium ribbon is a elemental form,after burning in the presence of oxygen in air , it changes to magnesium oxide that is a powder form as there is a formation of chemicals there is a breakdown of chemical bond. so it is considered as chemical change.
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Magnesium is a highly reactive metal. When exposed to air for a long time it gets coated with the layer of oxide which is physically and mentally stable and therefore, partly masks the reactivity of magnesium. The oxide coating does not burn when a flame is brought in contact with the metal. Therefore, the surface should be cleaned, with a sandpaper before burning the magnesium ribbon in air.
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