Ingredients made up of only types of atoms or one type of molecules is considered as pure substances. A pure substances is which can not be separated by any physical method. It has constant chemical composition. it has variable chemical composition and can be separated by physical method .
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Ingredients made up of only types of atoms or one type of molecules is considered as pure substances. A pure substances is which can not be separated by any physical method. It has constant chemical composition. it has variable chemical composition and can be separated by physical method .