Physical Chemistry — Handwritten Notes (Narendra Avasthi)
Physical chemistry rewards students who can connect formulas to physical meaning, and these 198 handwritten pages by Narendra Avasthi are built around exactly that idea. Rather than presenting equations in isolation, the notes walk through derivations, worked examples, and the reasoning behind each step. You see the thermodynamic logic before you see the final expression, which makes the mathematics feel less arbitrary.
The material spans seven major areas: thermochemistry, electrochemistry, liquid solutions, solid state, surface chemistry, colloids and emulsions, and catalysis. That spread covers a substantial portion of the B.Sc physical chemistry syllabus across multiple semesters, and the depth in electrochemistry — nearly sixty pages — reflects how central that topic is to both coursework and competitive exams.
Key Features
What separates these notes from a standard textbook is the numerical density. Thermochemistry alone covers bomb calorimetry calculations, bond energy problems, Hess's law applications, and Born-Haber cycle constructions — each with numbers plugged in, not just the formula. The electrochemistry section goes from Daniell cell construction through Nernst equation derivations to concentration cells and Faraday's laws, maintaining a consistent thread of worked problems throughout.
Table of Contents
| Chapter | Pages | Highlights |
|---|---|---|
| Thermochemistry | 1–21 | Enthalpy, neutralization, calorimetry, bond energy, Hess's law |
| Electrochemistry | 22–79 | Galvanic cells, electrode potentials, Nernst equation, Faraday's laws |
| Liquid Solutions | 80–128 | Raoult's law, colligative properties, vapour pressure |
| Solid State | 129–169 | Crystal lattices, unit cells, packing efficiency, defects |
| Surface Chemistry | 170–177 | Adsorption isotherms, surface phenomena |
| Colloids & Emulsions | 178–187 | Classification, preparation, properties of colloids |
| Catalysis | 176–177 | Homogeneous and heterogeneous catalysis |
Who Should Read This
First-year students will likely start with thermochemistry and the fundamentals of electrochemistry, since those topics appear early in most syllabi. Second-year undergraduates get the most mileage from liquid solutions and solid state — colligative properties and crystal packing are perennial exam favourites. Third-year students can use the surface chemistry and catalysis sections as revision material, or as a bridge into more advanced physical chemistry courses.
The handwritten format matters more than you might expect. Equations are annotated with marginal notes explaining what each term represents, and diagrams of galvanic cells, electrochemical series, and Born-Haber cycles are drawn with enough care to reproduce during an exam. Liquid solutions and solid state receive equally patient handling — Raoult's law deviations, colligative property derivations, unit cell calculations, and packing efficiency all appear with solved numericals attached. When your professor asks you to derive the relationship between boiling point elevation and molality, these pages will remind you how it was done in class.