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Chemical Kinetics

Tamil Nadu Board · Class 12 · Chemistry

Quick revision notes for Chemical Kinetics — Tamil Nadu Board Class 12 Chemistry. Key concepts, formulas, and definitions for last-minute revision.

45 questions40 flashcards5 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 Notes

Key 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 Chemical Kinetics Concept Map, Chemical Kinetics - Concept Hierarchy, Flowchart showing how reaction rate is determined for reactants and products. These are the concepts Tamil Nadu Board Class 12 examiners draw on most — study them first, then practise related questions.
How to score full marks in Chemical Kinetics — Tamil Nadu Board Class 12 Chemistry?
Understand the core concepts first, then work through the 45 practice questions available for this chapter. Revise formulas and 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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All 15 chapters — Tamil Nadu Board Class 12 Chemistry Revision Notes

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