Key Summary & High-Yield Concept Takeaways
Curated by senior faculty at Hodu Academy for fast revision, formula derivations, and standard board & competitive exam marking schemes.
- ✓250+ Key Chemistry concepts, definitions & reactions ( IGCSE & IB compatible)
- ✓All important formulas , equations and short explanations
- ✓Laws, principles, SI units & constants in Chemistry
- ✓Quick clarifications for tough Chemistry terms
Chemistry Important Concepts, Formulae & Laws (CBSE, IGCSE, IB, JEE, NEET)
Your shortcut to Chemistry excellence! Here’s your all-in-one list for crucial Chemistry concepts, definitions, formulas, laws and results – handpicked by Hodu Academy’s Chemistry team.
Perfect for last-minute revision, board exams (CBSE/ICSE/IGCSE/IB), NEET/JEE aspirants, and Olympiad winners. Every topic is mapped for fast learning and exam scoring.
Bookmark this page as your Chemistry cheat-sheet—latest for 2025, and 100% relevant for IGCSE, IB & other international boards!
Perfect for last-minute revision, board exams (CBSE/ICSE/IGCSE/IB), NEET/JEE aspirants, and Olympiad winners. Every topic is mapped for fast learning and exam scoring.
Bookmark this page as your Chemistry cheat-sheet—latest for 2025, and 100% relevant for IGCSE, IB & other international boards!
This page covers:
- 250+ Key Chemistry concepts, definitions & reactions (IGCSE & IB compatible)
- All important formulas, equations and short explanations
- Laws, principles, SI units & constants in Chemistry
- Quick clarifications for tough Chemistry terms
- Practice links, detailed notes and rapid revision
Why Use This Chemistry Cheat Sheet?
Chemistry is the link between Physics, Biology, and the material world. A high score in Chemistry matters for NEET, JEE, Olympiads, CBSE, ICSE, IGCSE, IB and more. But Chemistry has hundreds of formulas, reactions, structures and tricky laws – making last-minute revision a headache.
This page helps you:
Tip: Boost recall with Chemistry MCQ quizzes and reaction flashcards!
This page helps you:
- Revise hundreds of definitions, equations, trends and reactions in minutes
- Find every important formula or chemical law for direct application
- Look up names, periodic trends, laws, or organic reactions instantly
- Zero in on what’s actually asked in boards & competitive exams
- Be ready for IGCSE, IB & NEET Chemistry questions
Tip: Boost recall with Chemistry MCQ quizzes and reaction flashcards!
Complete Chemistry Important Concepts, Formulas & Laws List
250+ must-know Chemistry topics for Boards & Competitive Exams (including IGCSE & IB)
Categories covered: Atomic Structure, Periodic Table, Physical Chemistry, Chemical Reactions, Organic Chemistry, Inorganic Chemistry, Environmental, Industrial, Everyday Chemistry & more!
Mapped to: CBSE, ICSE, IGCSE, IB Diploma, NEET, JEE & Olympiads
Mapped to: CBSE, ICSE, IGCSE, IB Diploma, NEET, JEE & Olympiads
| 118 Elements and Their Symbols and Atomic Numbers | Acetone | Acid And Base Difference | Acids Bases and Salts | Actinides |
| Addition Reaction | Adsorption Chromatography | Aldol Condensation | Alkali Metals | Ammonium Chloride |
| Applications of Redox Reactions | Argon | Arrhenius Equation Rate Constant And Temperature | Atomic Number Mass Number | Aufbau Principle |
| Aufbau Principle, Paulis Exclusion Principle and Hands Rule | Bakelite: Structure and Uses | Benzene Reactions | Benzoic Acid - Structure and Properties | Biodegradable and Non Biodegradable |
| Calcium Oxide | Cathode Ray Experiment | Charles Law | Chemical And Its Composition | Chemical Formula of Common Compounds |
| Classification Of Carbohydrates and Its Structure | Classification of Organic Compounds | Coefficient of Viscosity - Definition, Formula and Example | Colligative Properties beRelative Lowering of Vapour Pressure | Colloidal Solution |
| Components of Air | Condensation | Conformation | Cracking Meaning | Crystallization |
| Decantation | Decomposition Reaction | Dehydration of Alcohols | Difference Between Alkali and Base | Difference Between Atom And Ion |
| Difference Between Atom and Molecule | Difference Between CNG and LPG | Difference between Compound and Mixture | Difference Between Element And Compound | Difference Between Exothermic and Endothermic Reactions |
| Difference Between Mixture and Solution | Difference Between Molecule and Compounds | Difference Between Organic And Inorganic Compounds | Difference between Physical and Chemical Change | Difference between Vapor and Gas |
| Disaccharides | Discovery of Protons and Neutrons | Distillation | Effects of Burning Fossil Fuels | Electromeric Effect |
| Electron Configuration | Electronic Configuration of First 30 Elements | Electronic Configuration of Iron | Electroplating Process | Endothermic Reaction |
| Enthalpy Change | Enzyme Catalysis | Ester | Ester Hydrolysis | Ethanoic Acid |
| Exothermic Reaction | Filtration | Fuel Types | Functions of Nucleic Acids | Glycerin |
| Glycine Structure | Glycogen | Gravimetric Analysis | Group 17 Trends Properties | Heat Capacity Cp Cv Relation |
| Heavy Water | Homogeneous Mixture and Heterogeneous Mixture | Hunds Rule | Hybridization | Hydrochloric Acid |
| Hydrogen Peroxide | Introduction: Importance of Forest | IR Spectroscopy | Iron | Krypton |
| Lewis Dot Structures | Metallic Bonds | Metals and Nonmetals | Methanol | Mineral Resources |
| Mixtures | Modern Periodic Table and Its Significance | Mole Concept | Monosaccharides | NaHCO3 |
| Natural Polymers | Neutralization Reaction | Non Metals | Oxalic Acid | Oxygen |
| Periodic Table Elements | Periodic Trends in Properties of Elements | Pesticides | Phenol Preparation | Phosphoric Acid |
| Physical and Chemical Properties of Carbon | Physical And Chemical Properties of Water | Physical Change and Chemical Change | Polarity | Polymers Uses |
| Polyvinyl Alcohol | Positron | Potassium | Potassium Dichromate - Formula, Properties and Uses | Potassium Permanganate |
| Precipitation Reaction | Preparation of Benzene | Preparation Properties and uses of Sodium Chloride | Properties of Boron Family | Properties of Solution |
| Redox Titration | Relation Between Normality And Molarity | Rusting Iron Prevention | Rutherford Atomic Model | Rutherford Atomic Model |
| Shapes of Molecules Vsepr Theory | Shapes of Orbitals | Sieving | SilkWorm - Life Cycle of Silkworm, Diagram | Silver Nitrate |
| Soaps And Detergents | Sodium Hydroxide | Structure of Benzene | Sublimation | Synthetic Fibres And Natural Fibres |
| Synthetic Polymers | Tollens Test | Toluene | Transition Metals | Tyndall Effect |
| Types of Organic Reactions | Types of Solutions | Types of Titration - Acid Base Titration | Unsaturated Solutions | Ununoctium |
| Ununpentium | Uses of Acetone | Uses of Air | Uses of Bauxite | Uses of Carboxylic Acid |
| Uses of Coal | Uses of Ethers Health In Care Industry | Uses of Formaldehyde | Uses of Graphite | Uses of Methanol and Ethanol |
| Uses of Minerals | Uses Of Nitric Acid | Uses of Phenol | Uses of Propanol | Uses of Sulfuric Acid |
| Uses of Water | Valence Bond Theory | Volumetric Analysis | Waste | Water Cycle Process |
| What is Dipole Moment? | What is Eutrophication? | What is Metallurgy? | Wurtz Reaction | Mohr’s Salt Titration with KMnO4 |
| Gattermann Reaction | Benzene | Brown Ring Test | Calcium Carbonate | Cotton and its Various Uses |
| Difference between Petrol and Diesel Engine | Difference between Sigma and Pi Bond | Element-Manganese (Mn) | Friedel Crafts Reaction | Hofmann Elimination |
| Isomerism | Laws of Chemical Combination | Mannich Reaction | Methods of separation | Molisch’s Test |
| Name Reactions | NMR Spectroscopy | Non – Aqueous Titration | Ozonolysis Mechanism – Ozonolysis of Alkenes and Alkynes | Periodic Classification of Elements |
| Pinacol Pinacolone Rearrangement | Planck’s Quantum Theory | Pseudo First Order Reaction | Rosenmund Reduction Mechanism | Salt Analysis |
| Saponification | Science in Everyday life and Its Importance | Sericulture: Rearing of Silkworm to Produce Silk | Spectrophotometer Principle | Zone Refining |
| Reactivity Series | Difference between isotropic and anisotropic | Introduction to p-Block elements | Plant fibres | Inert Gases: Uses |
| Benzoin Condensation | Difference between primary cell and secondary cell | Partition Chromatography | Applications of colloids | Displacement Reactions |
| Handpicking | Biogas: Uses of Biogas | Acid Rain | Types of Chemical Reactions | SN2 Reaction Mechanism |
| Complexometric Titration | markovnikov rule | Kohlrausch Law | Electrode | Valency Chart |
| Order of Reaction | Band Theory | Difference Between Rusting and Corrosion | Potentiometric Titration | Frenkel Defect |
| Deforestation | Stephen Reaction Mechanism | Gattermann – Koch Reaction Mechanism | Electronegativity | Industrial Waste: Types |
| Ethylene | Charge to Mass Ratio of an Electron | Fehling Solution | Photochemical Reactions | Difference Between Endpoint and Equivalence Point |
| Second Order Reaction | Etard Reaction | Forms of water | Preparation of Acetanilide | Metallic Minerals and Non-Metallic Minerals |
| Ferric Chloride | Henry's Law | Preparation of Mohr's salt | Schottky Defect | Claisen rearrangement |
| Calcium sulphate | Sodium carbonate | Rubber | Ethyl acetate | Conductometric Titration |
| Resorcinol | Difference Between Evaporation and Condensation | States of Matter | Boric Acid | Types of Minerals |
| Finkelstein Reaction | Electronegativity Chart | Difference between Solid, Liquid and Gas in tabular form | Aromaticity | Drawbacks of Rutherford's Atomic Model |
| Thermosetting Polymers | Preparation of Alkanes | Examples of Bases | Suzuki Coupling Reaction | Standard Electrode Potential |
| Disadvantages of Plastics | Reducing Agent | Van't Hoff Factor | Hard Water and Soft Water | Organometallic compounds |
| Gay Lussac's Law | Slaked Lime | Borax | Tetravalency of Carbon | Boyle's Law |
| Ellingham Diagram | Crystal Defects : Point Defects | HVZ Reaction (Hell-Volhard-Zelinsky Reaction) | Classification of Drugs | Preparation of Sulfuric Acid |
| Lucas test | Xenon Difluoride | Bravais Lattice | Classification of Oxides | Elimination Reaction |
| preparation of polythene, Teflon and polyacrylonitrile | Difference between cations and anions | Uses of Limestone | Fructose | Azeotropes |
| Lewis Acid and Base | Emulsification | Dielectric properties of solids | Zwitterion | Birch Reduction Mechanism |
| Oxidation and Reduction | Electrophilic Substitution Reaction | Suspensions | Aromatic Compounds | Ores and Minerals |
| Adsorption theory of heterogeneous catalysis | Wittig Reaction | Difference between evaporation and boiling | Intensive And Extensive Properties Of Matter | Electronic Configuration of Group 16 Elements |
| Difference Between Elements and Atoms | Sodium Oxide | Gypsum | Difference Between Alloy and Composite | Chemical Equations |
| Thorium | Lead Acid Battery | Isotopes of Hydrogen | Significant Figure Rules | Electrophilic Addition Reactions Of Alkenes |
| Isothermal Expansion of an Ideal Gas | Potassium Chloride - KCl | Aluminum Oxide | Difference Between Acetic Acid and Glacial Acetic Acid | Difference Between Polar and Nonpolar |
| Difference Between Baking Powder and Baking Soda | Test for Phenolic group | To prepare colloidal solution of starch | Uses of Mica | Pi Bonds |
| Potassium Chlorate | Schmidt Reaction | High density Polyethylene | Huckel's Rule | Discovery of Proton |
| Aluminium Ore: Extraction of Aluminium | Benzene Hexachloride | Caustic Potash or Potasium Hydroxide | Electromagnetic Radiation - Wave Nature | Atomic Number and Mass Number, Isotopes and Isobars |
| Preparation of Potash Alum | Beckmann Rearrangement | Heterogeneous Equilibrium | Butane | Factors Affecting Electrolytic Conductance |
| Scandium | Homogeneous Equilibrium | Phenols Nomenclcature | Galvanic Corrosion | Chlorine Trifluoride |
| Robinson Annulation | Copper | Pyridine | Silver Carbonate | Harmful Effects of Radiation |
Chemistry Must-Know Laws, Principles & Constants
Important Laws & Principles:
Physical Constants:
- Periodic Law, Mendeleev’s & Modern Periodic Law, Avogadro’s Law
- Law of Conservation of Mass, Law of Definite Proportions, Law of Multiple Proportions
- Boyle’s Law, Charles’ Law, Gay-Lussac’s Law, Henry’s Law, Raoult’s Law
- Arrhenius, Bronsted-Lowry & Lewis Acid-Base Theory
- Colligative Properties, Nernst Equation, Faraday’s Laws of Electrolysis
- Le Chatelier’s Principle, Hess’s Law, Dalton’s Law of Partial Pressures
- Principle of Limiting Reactant, van’t Hoff Factor, Kohlrausch’s Law
- Aufbau Principle, Hund’s Rule, Pauli Exclusion Principle, Heisenberg Uncertainty Principle
Physical Constants:
- Avogadro’s Number (NA) = 6.022 × 1023 mol-1
- Gas Constant (R) = 8.314 J/mol·K
- Faraday’s Constant (F) = 96500 C/mol
- Boltzmann Constant (k) = 1.38 × 10-23 J/K
- Speed of light (c) = 3 × 108 m/s
- Planck’s constant
= 6.626 × 10-34 Js
Tips to Score 90+ in Chemistry
- Memorize all formulas, laws and reactions (use this table for daily revision!)
- Practice MCQs, mechanisms and numerical problems for every chapter
- Review definitions, periodic trends, and chemical names often
- Create quick reaction maps and property tables for organic and inorganic topics
- Use Hodu Academy’s Chemistry quizzes for rapid practice
For PDF downloads, practice sheets, or doubts, Contact Hodu Academy now!
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