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Why is biology divided into the physical and applied branches?

Why is biology divided into the physical and applied branches? In biology, living organisms, including their structure, function, growth, reproduction, classification, origin, and evolution are discussed. Biology also teaches how to use this knowledge to improve human life. To discuss this knowledge in detail, biology has been divided into two branches. one is physical biology in which theoretical concepts are discussed, and the other is applied biology in which the way of using theoretical knowledge is discussed. Actually, for learning and using knowledge easily and effectively, biology is divided into these two parts.



Secondary Chemistry

Higher Secondary Chemistry, Part-1

Safe Use of Laboratory

  • Laboratory Principles: Dress, Safety Glass, Mask, and Hand Gloves
  • Safe Way of Using Glassware
  • Techniques of cleaning of Laboratory, Equipment, and Glassware
  • Paul-Bunge Balance, Digital Balance (2-digit and 4-digit)
  • Measuring Cylinder

Qualitative Chemistry

  • Rutherford's Atomic Model
  • Bohr's Atomic Model
  • Derivation of Equation of Radius of n-th Circular Path, Speed of Moving Electron of Atom Similar to Hydrogen by Bohr's Theory
  • Wave Mechanics and Schrodinger Equation about Structure of Atom
  • Quantum Numbers, Different Subshells and Their Electron Containing Capacity
  • Relationship between Quantum Numbers and Spectra
  • Order of Energy of Quantum Subshells
  • Shapes of Orbital
  • Aufbau Principle
  • Hund's Principle
  • Pauli's Exclusion Principle
  • Electromagnetic Spectrum
  • Source of Line Spectrum and Identification of Elements
  • Bohr's Atomic Model and Hydrogen Atomic Spectrum
  • Explanation of Hydrogen Spectra by Bohr's Theory
  • Use of UV-radiation to Detect Fake Passport/Currency
  • Use of IR-radiation in Medical Treatment
  • Basic Principle of MRI for the diagnosis of Diseases
  • Solubility and Solubility Principle
  • Solubility Product

Periodic Properties and Chemical Bonding of Elements
Chemical Changes
Vocational Chemistry

Higher Secondary Chemistry, Part-2

Environmental Chemistry

  • Components of Atmosphere
  • Effects of Changes of Temperature, Pressure and Humidity of Air in causing Cyclones and Tidal Bores
  • Laws of Boyle, Charles, Avogadro, Gay-Lussac; Dalton's Law of Partial Pressure and Graham's Law of Diffusion
  • Ideal Gas
  • Real Gas
  • Diffusion
  • Effusion
  • Rate of Diffusion
  • Law of diffusion
  • Postulate of Kinetic theory of Gases
  • Determination of Kinetic Energy from Equation of Kinetic Theory
  • Application of Gas Laws in Cylinder Gases
  • The Chemical Reaction and Nitrogen Fixation in Atmosphere during Thunderstorm
  • Industrious Gaseous Pollutants and Air Pollution
  • Sources of Green House Gases Effects
  • Uses of CFCs and Depletion of Ozone Layer
  • Causes of Acid Rain & its Prevention
  • Theory of Arrhenius
  • Bronsted - Lowry Theory 
  • Conjugate Acid - Base
  • Lewis Theory Related to Acids and Bases
  • Sources of Fresh Water
  • Importance of Fresh Water
  • Standard of Measurement of Purity and Hardness of Surface Water (pH, DO, BOD, COD, TDS)
  • Hardness of Water
  • Estimation of Hardness of Water
  • pH of Water
  • Dissolved Oxygen in Water, DO
  • Biological Oxygen Demand, BOD
  • Chemical Oxygen Demand, COD
  • Total Dissolved Solid, TDS
  • Industrial Wastes and Water Pollution
  • Causes of Water Pollution 
  • Prevention of Water Pollution from Source
  • Natural Pollution of Water
  • Arsenic Pollution of Water
  • Effect of Water Pollution
  • Food Chain Contamination by Heavy Metals
  • Classification of solutions: The Process of Dissolving of Pollutants in Water and Air

Organic Chemistry

  • Classification of Organic Compounds
  • Homologous Series
  • Functional Group
  • Students Activities: Identification of a series of organic compounds on the basis of functional group
  • Isomerism of Organic Compound and its classifications
  • Aromatic Hydrocarbons
  • Difference between Aliphatic and Aromatic Compounds
  • Addition Reaction of Aliphatic Compounds
  • Substitution Reaction of Aliphatic Compounds
  • Elimination Reactions of Aliphatic Compounds
  • Multi Substitution Reactions of Benzene
  • Orientation of Substituents in Benzene Ring
  • Alkane, Alkene, Alkyne, Alkyl/Aryl Halide, Alcohol, Ether, Aldehyde, Ketone, Carboxylic Acid, Ester, Amine
  • IR Spectroscopic Absorption/ Emission band for the Identification of Functional Group
  • Preparation of Glycerine and Phenol and Identification Reactions
  • Nitroglycerine, TNT, Dettol, Paracetamol Preparation and Uses
  • Role of Melting point and Boiling point to Detect Organic Compounds and Their Purity
  • Polymer and Plasticity
  • Addition and Condensation Polymer Molecules
  • Role of Organic Compounds in Society and the Environment

Qualitative Chemistry

  • Chemical Calculation and Molar Volume of Gases
  • Volume of Gases from Chemical Equation
  • Determination the Mass and Volume of Gas from Reactant
  • Conversion of Molarity into Percentage and ppm Unit
  • Acid - Base Neutralization Reaction and Promotion Point
  • Oxidation Reaction
  • Reduction Reaction
  • Oxidising agent and Reducing agent
  • Indicator
  • The Application of Beer Lambert Law to Determine the Concentration of the solution
  • Quantitative Analysis of Atomic Absorption, UV-Visible Spectroscopy HPLC and GC


  • Electrical Conductors and its Classification
  • Measurement of Electrolytes Using Faraday's First Law
  • Activity Series of Metals
  • Comparative Activity Tests of Metals
  • Oxidation Half-Reactions and Reduction Half-Reactions
  • Electrode and its Classifications
  • Electrochemical Cell of one and two Component (Electrolyte and Galvanic)
  • Formation of Rechargeable Battery (Lead Storage and Lithium), Procedure and Recharge process
  • Advantages and Disadvantages of using Lead Storage and Lithium Battery
  • Fuel Cell and its Classification
  • Anode, Cathode and Fuel of Fuel Cell
  • Formation of Fuel Cell and Reactions
  • Advantage of Hydrogen Fuel Cell
  • Measurement of pH Using pH Meter

Economical Chemistry

  • The Natural Gas Fields of Bangladesh and Uses of Natural gas
  • Coal Fields in Bangladesh Quality and Uses of Coal
  • Probability of Industrialization in Bangladesh on Basis of Fuel Resources
  • Introduction to Mentionable Chemical Industries
  • Basic Principle of Urea, Glass, Ceramic, Pulp-Paper and Cement Production
  • Principles of Leather Tanning
  • Pollutants of  Cement, Urea, Leather, Textile and Dyeing Industries
  • Principle of Controlling Air Pollution
  • Principle of Action of Effluent Treatment plant
  • Recycling of Iron, Aluminum, Copper, Glass, Paper and Plastic Substances
  • Importance of Recycling of Iron, Aluminium, Copper, Glass, Paper and Plastic in Social and environmental Fields
  • Advantages and Disadvantages of Coal-Based Power Plant
  • Concept of Nanoparticle and Nanotechnology
  • Comparison Among Atom, Molecule and Nanoparticle
  • Comparison of Physical Properties between Nanoparticles and Normal State of Matter
  • Probability of Application of Nanoparticles in Industries


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