Chemistry formula books play a crucial role in competitive exam preparation, especially for engineering entrance examinations like IIT-JEE. The PDF you uploaded is a compact Chemistry Formula Book for Engineering Entrance Examinations, designed to provide short formulas and key relationships across major Physical Chemistry topics. Instead of lengthy theory, it focuses on concise expressions, equations, and conversions that students need for fast revision and quick problem solving.
I am writing about this PDF because many students spend a lot of time searching for formulas from different books and notes. A single formula book that gathers essential equations in one place saves time and improves accuracy. This document is particularly useful during last-minute revision when students want to recall formulas quickly and practise numerical problems without going back to full chapters.
Short Formulas for Atomic Structure
The first section of the PDF provides short formulas related to atomic structure and quantum theory. It includes expressions from Planck’s quantum theory, photoelectric effect, Bohr’s model of hydrogen atom, and de Broglie wavelength.
Key formulas included are:
- Energy of one photon
- Radius of orbit and energy of electron in hydrogen atom
- Velocity of electron in different orbits
- de Broglie wavelength of particle
The PDF also lists important quantum numbers, their allowed values, and formulas related to orbital angular momentum and maximum number of electrons in a subshell.
Heisenberg Uncertainty Principle and Quantum Numbers
Another part of the PDF highlights Heisenberg’s uncertainty principle in different mathematical forms. It also summarises principal, azimuthal, magnetic, and spin quantum numbers with their significance.
This section helps students quickly revise theoretical points that often appear in objective questions.
Stoichiometry and Mole Concept
The formula book contains a clear Y-map showing the relationship between mass, moles, number of particles, and volume at STP. It also provides formulas for:
- Relative atomic mass
- Density and vapour density
- Molar mass of gases
- Mole-mole and mass-mole conversions
Concentration terms such as molarity, molality, mole fraction, and percentage composition are listed with direct formulas and interconversion relationships.
Equivalent Weight, Normality and Valency Factor
The PDF includes formulas to calculate equivalent weight for elements, acids, bases, oxidising agents, and reducing agents. It also explains:
- Normality and its relation with molarity
- Valency factor (n-factor)
- Relationship between equivalents and moles
These formulas are very useful for redox titration and acid-base problems.
Gaseous State Formulas
A large portion of the formula book is dedicated to the gaseous state. It covers:
- Boyle’s law
- Charles’ law
- Gay-Lussac’s law
- Ideal gas equation (PV = nRT)
- Dalton’s law of partial pressures
- Graham’s law of diffusion
The PDF also lists kinetic theory of gases equations, including average kinetic energy, root mean square speed, average speed, and most probable speed.
Van der Waals equation and its critical constants are provided along with reduced equation of state.
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Thermodynamics Short Formulas
The thermodynamics section summarises all major formulas related to:
- Types of thermodynamic processes (isothermal, adiabatic, isobaric, isochoric)
- First law of thermodynamics
- Work done in different processes
- Heat capacity at constant pressure and constant volume
- Enthalpy, entropy, and Gibbs free energy
It also includes entropy change formulas for reversible processes and criteria for spontaneity using Gibbs free energy.
Thermochemistry
Important thermochemistry formulas included are:
- Enthalpy change of reaction
- Kirchhoff’s equation
- Enthalpy of formation
- Estimation of enthalpy from bond enthalpies
These formulas help students calculate heat changes for reactions easily.
Chemical Equilibrium
The last section focuses on chemical equilibrium and lists the basic condition at equilibrium:
- Rate of forward reaction equals rate of backward reaction
- Concentrations of reactants and products remain constant
- ΔG = 0 at equilibrium
This quick summary helps in revising equilibrium concepts before exams.
Why This Formula Book Is Useful
This PDF acts as a quick revision tool rather than a theory textbook. It is best used alongside regular study material and practice questions. Students can:
- Revise formulas quickly before tests
- Avoid missing important equations
- Improve speed in numerical problem solving
