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*If the reaction of burning magnesium is a chemical change, then we should be able to see a change in color, smell, or any other properties of a chemical change (the substance should change). Discussion. Results/Pictures. Identifying a Physical or Chemical Change in Burning Magnesium. Methods. * Materials used.
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.