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Reversible Reactions and Dynamic Equilibrium

Edexcel AS-level ChemistryTopic 21 of 2118 lessons

Revision notes for Reversible Reactions and Dynamic Equilibrium in Edexcel Chemistry (8CH0). Every lesson in BrainCake comes with R.E.C.I.P.E. recall steps, a quick check and spaced reviews.

  1. Reversible ReactionsA reversible reaction is one that can go in both directions: the reactants form the products, and the products can react to re-form the reactants.
  2. Dynamic EquilibriumWhen a reversible reaction takes place in a closed system (nothing can enter or leave), it eventually reaches dynamic equilibrium.
  3. Effect of Change in ConcentrationLe Chatelier's principle states that if a system at equilibrium is subjected to a change in conditions, the position of equilibrium shifts in the…
  4. Effect of Change in PressureA change in pressure only affects the position of an equilibrium that involves gases, and only when there are different numbers of gas molecules on…
  5. Effect of Change in TemperatureThe enthalpy change quoted with an equilibrium equation always refers to the forward reaction.
  6. Effect of CatalystsA catalyst does not change the position of equilibrium, so it does not change the equilibrium yield of product.
  7. Limitations of PredictionsLe Chatelier's principle is a useful rule, but its predictions have limitations.
  8. Homogeneous and Heterogeneous EquilibriaEquilibria are classified by the phases (states) of the species taking part.
  9. The Equilibrium LawFor a reversible reaction at equilibrium at a fixed temperature, the concentrations of reactants and products are related by the equilibrium law.
  10. Homogeneous SystemsIn a homogeneous system all the species are in the same phase, so every reactant and product appears in the Kc expression.
  11. Heterogeneous SystemsIn a heterogeneous system the species are in more than one phase.
  12. Industrial ProcessesIndustry needs a high yield, a fast rate, low costs and safe operation.
  13. The Contact ProcessSulfuric acid is made by the Contact process.
  14. Exam-Style Questions - 1Question.
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  18. Exam-Style Questions - 5Question.

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