Atoms and Molecules – Class 9 Science
The chapter “Atoms and Molecules” in Class 9 Science introduces the fundamental building blocks of matter. Everything around us is made up of atoms, which combine in fixed ratios to form molecules. Students learn about Dalton’s Atomic Theory, the concept of atoms, molecules, and how elements combine to form compounds.
This chapter also explains the laws of chemical combination, including the Law of Conservation of Mass, Law of Definite Proportions, and Law of Multiple Proportions, with examples. Concepts like molecular mass, formula unit, and the calculation of the number of atoms and molecules in a substance are also covered.
NCERT Class 9 Science provides simple diagrams, explanations, and numerical examples to help students understand the microscopic structure of matter. Learning this chapter builds a strong foundation for chemistry by explaining how substances interact at the atomic and molecular level.
