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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.
This is another way to define chemical change:. A process in which chemical bonds are broken and new ones are made. A process like grinding some salt crystals into a fine powder does not involve the breaking of chemical bonds and the formation of new ones, so it is a physical change.