Chapter 13 of 15
Revision Notes
Chemical Kinetics — Revision Notes
Tamil Nadu Board · Class 12 · Chemistry
Chemical Kinetics revision notes for Tamil Nadu Board Class 12 Chemistry: 4 topics in quick points. Includes Rate of Chemical Reaction - Fundamentals.
45 questions40 flashcards3 formulas & key relations5 concepts
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Key Topics to Revise
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1. Rate of Chemical Reaction - Fundamentals
- Rate is the change in concentration of reactants or products per unit time
- For reactants: Rate = -Δ[A]/Δt (negative sign because concentration decreases)
- For products: Rate = +Δ[B]/Δt (positive because concentration increases)
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2. Rate Law and Rate Constant
- Rate law expresses how rate depends on concentrations of reactants
- Rate law CANNOT be predicted from balanced equation - must be determined experimentally
- Order of reaction = sum of powers of concentration terms in rate law
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3. Molecularity and Reaction Mechanism
- Molecularity = total number of reactant molecules in a single elementary step
- Molecularity is always a whole number (1, 2, or 3) - never fractional
- Molecularity applies to elementary steps ONLY, not to overall reaction
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4. Integrated Rate Equations
- Integrated rate equations contain time as variable - answer questions about concentration at specific times
- Different forms for zero, first, and higher-order reactions
- First-order reactions: ln[A] vs t is linear; slope = -k; intercept = ln[A]₀
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Full NotesKey Concepts
The rate of a reactionAverage rate is calculated overThe rate law expresses how reactionReaction order is the sumMolecularity is the number of reactant
Frequently Asked Questions
What are the important topics in Chemical Kinetics for Tamil Nadu Board Class 12 Chemistry?
Key topics in Chemical Kinetics include Rate of Chemical Reaction - Fundamentals, Rate Law and Rate Constant, Molecularity and Reaction Mechanism, Integrated Rate Equations. Study these first, then practise questions on each for the Tamil Nadu Board Class 12 board exam.
How should I revise Chemical Kinetics for the Tamil Nadu Board Class 12 board exam?
Learn the core ideas first, then work through the 45 practice questions on Chemical Kinetics. Revise definitions regularly and use flashcards for quick recall before the exam.
Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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