🧪 Chemical Kinetics Class 12 Notes PDF (Handwritten & NCERT-Based)

💬 Introduction

This chapter name is chemical kinetics class 12 notes pdf.

Have you ever wondered why milk sours faster in summer or why a rusted nail takes months to form? 🤔
That’s Chemical Kinetics in action — the science of how fast reactions happen and what makes them faster or slower.

If you’re a Class 12 student preparing for Boards, JEE, or NEET, this topic is pure gold! ✨
Here you’ll find beautiful handwritten notes, key formulas, and crystal-clear explanations — all aligned with NCERT.

📥 Download Handwritten Notes PDF: (Scrol down)
👉 Click Here to Download Chemical Kinetics Class 12 Handwritten Notes (Free)

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⚗️ What is Chemical Kinetics? (chemical kinetics handwritten notes class 12)

In simple words, Chemical Kinetics = Speed of a Chemical Reaction.

It tells us:

• How quickly reactants turn into products 🔄
• What affects that speed (temperature, concentration, catalyst, etc.)
• How to calculate the rate mathematically

Example:
When magnesium reacts with HCl, bubbles appear instantly.
But when iron rusts, it takes days.
👉 Both are chemical reactions — but with different rates.

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🧭 Rate of Reaction — The Heart of Kinetics

The rate of a chemical reaction is defined as:

This simply means how much reactant decreases or how much product increases per second.

💡 Fast reaction: Explosion of hydrogen gas
🐢 Slow reaction: Rusting of iron

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⚙️ Factors Affecting Rate of Reaction

Factor	How It Affects Rate	Example
Concentration	More molecules = more collisions	Dilute acid reacts slower than concentrated acid
Temperature	Higher T → faster reaction	Food spoils faster in heat
Catalyst	Speeds up reaction without being used	Enzymes in our body
Surface Area	Finer particles react faster	Powdered zinc reacts faster than zinc strip
Nature of Reactants	Ionic reactions are faster than covalent	NaCl + AgNO₃ is instant

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🧮 Rate Law & Rate Constant (k)

For a general reaction:

Rate =

Here:

• x, y = order of reaction (found experimentally)
• k = rate constant (depends on temperature, not concentration)

Order	Unit of k	Example
Zero	mol L⁻¹ s⁻¹	Photochemical reaction
First	s⁻¹	Decomposition of N₂O₅
Second	L mol⁻¹ s⁻¹	Reaction between NO and Cl₂

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⏱️ Integrated Rate Equations

🥇 First Order Reaction

👉 Half-Life:

Constant — doesn’t depend on [A].

🥈 Second Order Reaction

👉 Half-Life:

Decreases with increasing concentration. (chemical kinetics class 12 ncert pdf)

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🔥 Temperature Dependence — Arrhenius Equation

Where:

• Ea = activation energy
• R = gas constant (8.314 J/mol·K)
• T = temperature in Kelvin

➡️ Higher temperature → higher k → faster reaction.

📊 Graph Tip:
ln k vs 1/T gives a straight line with slope = −Ea/R.

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🧩 Catalyst – The Reaction Accelerator

A catalyst provides a new path with lower activation energy.
Think of it like a shortcut in a traffic jam 🚗💨 — you reach faster without changing your destination!

✅ Catalyst does not change:

• ΔH (enthalpy)
• Final composition of products

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📘 Order vs Molecularity (Easy Table) (chemical kinetics formulas class 12)

Property	Order	Molecularity
Definition	Sum of powers in rate law	Number of molecules in a single step
Value	Can be 0, 1, 2, fractional	Always whole number
Type	Experimental	Theoretical
Example	Rate = k[A]² → 2nd order	→ Bimolecular

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🧾 Quick Formula Sheet (Must-Memorize)

Concept	Formula
Rate Law
Half-life (1st order)
Arrhenius Equation
Integrated Rate (1st order)
Second Order

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✍️ Why You’ll Love These Handwritten Notes

✅ Clean, exam-oriented handwriting
✅ Covers all NCERT derivations & graphs
✅ Includes short tricks for numericals
✅ Perfect for last-minute revision
✅ Helpful for Boards, JEE, NEET

📥 Download the Handwritten PDF Now

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💬 FAQs — Chemical kinetics class 12 ncert pdf

Q1. What is the best definition of Chemical Kinetics?
It’s the study of the rate of chemical reactions and the factors affecting them. chemical kinetics class 12 ncert pdf download now.

Q2. Is this topic important for boards?
Absolutely — it carries 4 to 6 marks in CBSE exams every year.

Q3. What is the order of a reaction?
It’s the sum of powers of reactant concentrations in the rate law.

Q4. How can I score full marks in this chapter?
Memorize key formulas, practice NCERT numericals, and revise using these handwritten notes.

Q5. What is activation energy?
The minimum energy required by reactants to form products. class 12 chemistry notes pdf Downlaod now.

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🚀 Final Revision Tips :- chemical kinetics handwritten notes class 12

🔹 Practice at least 10 numericals daily
🔹 Revise graphs (ln k vs 1/T, [A] vs t)
🔹 Focus on differences (Order vs Molecularity)
🔹 Use your handwritten notes 1 day before exam — quick recall guaranteed! 💯

class 12 chemistry notes pdf

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Teacher Name – Dinesh Kumar

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