NCERT Class 9 Science

This chapter explains laws of chemical combination, Dalton’s atomic theory, the ideas of atoms, molecules, ions, and how to write ...

This chapter explores the difference between pure substances and mixtures, explains types of mixtures (homogeneous and heterogeneous), and describes solutions, ...

This chapter explores the physical properties of matter, its particulate nature, the three states of matter (solid, liquid, gas), and ...