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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.
One of the simplest examples of chemical change is when iron rusts. Leave a piece of iron unattended and, given time, it will have brownish blemishes, forming rust. Leave it out for even longer and, eventually, the entire iron piece is now rust or iron oxide.