Chemicals elements, compound and mixture. Iron (Fe, left), sulphur (S, right), iron sulphide (FeS, front) and mixture of iron and sulphur (back) in watch glasses. Iron sulphide is a chemical compound composed of iron and sulphur. They can not be separated without destroying the compound. The individual elements in the mixture are not chemically bonded to each other and can be physically separated. | |
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