9th Class Chemistry

Explore the basics of chemistry, including its definition, branches (physical, organic, inorganic, nuclear, biochemistry, environmental, electrochemistry, and thermochemistry). Learn about the history of chemistry, contributions of Muslim scientists like Jabir ibn Hayyan and Al-Razi, and fundamental concepts like matter, mass, substance, and classification of matter.

Understand the atomic structure starting from Dalton's atomic theory and its modifications. Study Rutherford's gold foil experiment, discovery of the nucleus, and his planetary model of the atom. Learn about the main postulates and limitations of Rutherford's atomic model and how it laid the foundation for modern atomic theory.

Discover the historical development of the periodic table from Al-Razi's classification to Mendeleev's arrangement. Learn about Dobereiner's triads, Newlands' law of octaves, and the modern periodic law by Moseley. Understand the structure of the modern periodic table with groups, periods, and blocks.

Learn about the forces that hold atoms together in molecules. Study the valence concept including octet and duplet rules, the orbital concept of bonding, and various types of chemical bonds including ionic bonds, covalent bonds, coordinate covalent bonds, and metallic bonds. Understand why atoms form chemical bonds to achieve stability.

Explore the three common states of matter - solid, liquid, and gas - and their interconversions. Study the characteristic properties of gases including indefinite volume and shape, diffusion, effusion, pressure, compressibility, density, and liquefaction. Understand how temperature and pressure affect the physical states of matter.

Understand the concept of solutions, including solute, solvent, and various types of solutions (aqueous, non-aqueous, saturated, unsaturated, supersaturated, dilute, and concentrated). Learn about concentration units including percent composition (mass/mass, mass/volume, volume/mass) and molarity for expressing solution concentrations.

Study the interconversion of chemical and electrical energy. Learn about oxidation-reduction (redox) reactions, definitions of oxidation and reduction through electron transfer, and oxidation states. Understand the rules for assigning oxidation numbers to elements in compounds and how to calculate them in various chemical species.