Chemical Kinetics Lecture 3 | Differential Rate Law, Order of Reaction & Units of Rate Constant

🔥 Chemical Kinetics Lecture 3 | Differential Rate Law, Order of Reaction, and Units of Rate Constant | ChembyKKSir

🌍 Namaste Dear Students! 🙏

Welcome to Lecture 3 of Chemical Kinetics, one of the most important and conceptual lectures in Physical Chemistry for Class 12, NEET, and JEE (Main & Advanced) aspirants.

In this lecture, I — Krishna Kumar Sah (ChembyKKSir) — have explained the Differential Rate Law in detail with clear logic and graphical understanding.
We have discussed how the rate of a reaction depends on the initial concentration of reactants, and how to interpret the graph between Rate and Concentration for zero-order, first-order, second-order, and third-order reactions.

You’ll also learn how to determine the order of a reaction when experimental observations are given in statement form —
like:
👉 “If concentration of reactant changes but rate doesn’t change” → what can be the order?
👉 “If concentration is made 8 times and rate becomes half” → how to find order?

We’ve also discussed how to find order and rate law from tabular experimental data, step-by-step — a topic that is frequently asked in both NEET and JEE.

Finally, we’ve covered the Units of Rate Constant (k) for different orders and introduced the Types of Chemical Reactions — Elementary and Complex Reactions, which are key to understanding Mechanism and Molecularity in upcoming lectures.

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💡 In This Lecture, You Will Learn:

✅ Meaning and Concept of Differential Rate Law
✅ Graph between Rate and Concentration for 0th, 1st, 2nd & 3rd Order Reactions
✅ How to determine order of reaction using statements and observations
✅ Solving problems like “When concentration changes, how does rate change?”
✅ Units of Rate Constant (k) for different orders
✅ Finding order from tabular experimental data
✅ Types of Reactions: Elementary & Complex Reactions
✅ Conceptual base for Integrated Rate Law (to be covered in Lecture 4)

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🎯 Who Should Watch This Lecture:

• Class 12 Students (CBSE, ICSE, ISC, IB, Cambridge & State Boards)
• NEET-UG Aspirants – For mastering Physical Chemistry concepts
• JEE Main & Advanced Aspirants – For concept + numerical foundation
• Students preparing for MHT-CET, KCET, WBJEE, VITEEE and other exams

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👨‍🏫 Educator:

Krishna Kumar Sah (ChembyKKSir)
Senior Chemistry Professor | Medical Head – EURO JEE–NEET, PCMC Pune
🎓 15+ Years of Experience | Mentored NEET AIR 75 & JEE Adv. AIR 48

✨ “Understanding Rate Law is the key to mastering Chemical Kinetics.”
✨ “Don’t just memorize formulas — feel the concept, visualize the logic.”

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🔥 Chemical Kinetics Lecture 3 | Differential Rate Law, Order of Reaction & Units of Rate Constant | ChembyKKSir 🔥

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