We have studied the physical nature of matter in previous chapter. Now in this chapter, we will study and know about the chemical nature of matter. • Classification of Matter on the Basis of Chemical Composition A complete classification of matter into fundamental groups is a difficult task. On the basis of chemical composition, the-matter exists either as a single substance or, as a mixture containing two or more substances.  • A sample of matter containing only one substance is called a pure substance.  A sample of matter containing two or more substances is called a mixture. What is a substance? A substance may be defined as follows: A kind…