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Chemical Kinetics

Punjab Board · Class 12 · Chemistry

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

44 questions30 flashcards5 concepts

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Key Topics to Revise

1

Rate of a Chemical Reaction

  • Rate of reaction = change in concentration of reactant or product per unit time
  • Rate of disappearance of reactant R: rate = -Δ[R]/Δt (negative sign because concentration decreases)
  • Rate of appearance of product P: rate = +Δ[P]/Δt (positive because concentration increases)
2

Rate Law, Rate Constant and Order of Reaction

  • Rate law (rate expression) relates the rate of a reaction to the concentration of reactants
  • For aA + bB → cC + dD: Rate = k[A]ˣ[B]ʸ where x and y are determined experimentally
  • x and y may or may not be equal to stoichiometric coefficients a and b
3

Molecularity of a Reaction

  • Molecularity = number of reacting species (atoms, ions, molecules) that must collide simultaneously in an elementary reaction
  • Molecularity is defined ONLY for elementary reactions, NOT for complex reactions
  • Unimolecular: 1 species involved — e.g., NH₄NO₂ → N₂ + 2H₂O
4

Integrated Rate Equations

  • Integrated rate equations relate concentration to time directly — easier to use than differential equations
  • ZERO ORDER: Rate = k[R]⁰ = k (rate is constant, independent of concentration)
  • Zero order integrated equation: [R] = [R]₀ - kt

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Full Notes

Key Concepts

The rate of a chemical reactionThe rate law (or rate expression)The order of a reactionThe rate constant is the proportionalityElementary reactions occur in a single

Frequently Asked Questions

What are the important topics in Chemical Kinetics for Punjab Board Class 12 Chemistry?
Key topics in Chemical Kinetics include Chemical Kinetics – Complete Chapter Overview, Flowchart showing the two ways to express reaction rate (disappearance vs. appearance) and their mathematical forms, Comparison between average and instantaneous rates showing their definitions and characteristics. These are the concepts Punjab Board Class 12 examiners draw on most — study them first, then practise related questions.
How to score full marks in Chemical Kinetics — Punjab Board Class 12 Chemistry?
Understand the core concepts first, then work through the 44 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.

More resources for Chemical Kinetics

All 5 chapters — Punjab Board Class 12 Chemistry Revision Notes

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