Where should I start in chemistry?

From the periodic table and valency. With those in place, bonding, reactions and calculations become far easier.

Do I have to memorise every reaction?

No. Once you can read the periodic table most reactions become predictable, and the memorising load drops sharply.

I keep mis-balancing equations — what helps?

Stop guessing and count the atoms of each element. Counting slowly becomes fast within a few weeks.

Class 9-10 Chemistry Book

বাংলায় পড়তে চাও? দেখো: নবম-দশম শ্রেণির রসায়ন বই

Almost everyone who struggles with chemistry struggles at the same point — moving on to equations without properly understanding the periodic table and valency. With that base in place, the rest of the book becomes surprisingly straightforward.

The chapters

The book opens with the idea of chemistry and laboratory safety, then states of matter, the structure of matter, the periodic table, chemical bonding, the mole concept and calculations, reactions, acid-base balance, mineral resources, chemistry for saving life and chemistry in our lives. The periodic table and bonding chapters are the foundation for all the rest.

Chemistry: learn it with interactive animations

An idea that is hard to picture from a still textbook diagram becomes obvious when you change the values yourself and watch it happen. Each simulation below comes with a full plain-language explanation, the formulas, solved examples, common mistakes and exam tips, so understanding and revision happen together.

Structure of the atom (Grade 8–11 · animation)
Acids, Bases and the pH Scale (Grade 8–11 · animation)
Electron configuration (Grade 9–11 · animation)
Gas laws: Boyle, Charles, Gay-Lussac, Avogadro and PV = nRT (Grade 9–11 · animation)
How an Ionic Bond Forms (Grade 8–11 · animation)
Electrolysis and Faraday’s Laws (Grade 9–12 · animation)
Covalent Bond (Grade 9–12 · animation)
Periodic Trends (Grade 9–11 · animation)
Reaction rate and collision theory (Grade 9–12 · animation)
States of matter: solid, liquid, gas and the heating curve (Grade 8–10 · animation)
Atomic orbitals: the shapes of s, p and d, quantum numbers and nodes (Grade 11–12 · animation)
Molecular shapes and VSEPR theory: bond pairs, lone pairs and angles (Grade 11–12 · animation)
The mole concept: molar mass, Avogadro’s number and molar volume (Grade 9–11 · animation)
Diffusion and effusion: Graham’s law of gases (Grade 11–12 · animation)
Balancing chemical equations: method, examples and practice (Grade 9–10 · animation)
Chemical equilibrium: the equilibrium constant Kc and Le Chatelier’s principle (Grade 11–12 · animation)
Titration: finding an unknown concentration with a burette and an indicator (Grade 9–12 · animation)
Galvanic cell: the Daniell cell, EMF and the Nernst equation (Grade 11–12 · animation)
Redox reactions: oxidation numbers, electron transfer and half-equations (Grade 9–11 · animation)
Hydrocarbons: alkanes, alkenes, alkynes and structural isomers in 3D (Grade 10–12 · animation)
Functional groups: alcohols, aldehydes, ketones, acids, esters and amines (Grade 10–12 · animation)
Polymerisation: addition and condensation polymers, polythene and nylon (Grade 11–12 · animation)
Separation techniques: filtration, distillation, chromatography, crystallisation (Grade 9–11 · animation)
Crystal lattice: SC, BCC and FCC unit cells, packing efficiency and density (Grade 11–12 · animation)
Radioactivity: Alpha, Beta, Gamma Decay and Half-Life (Grade 11–12 · animation)

Download the book

The science-group textbook, in Bangla and English versions.

The Bangla version and the English Version are different books — download the one matching your medium.

The periodic table is the base

The periodic table is not a list to memorise but a map — which element sits where, why it sits there, and what its position predicts about its behaviour. Learn to read that map and valency, bonding and reactions all become predictable, at which point individual reactions no longer need memorising.