Knowledge Organiser: Dynamic Equilibrium & Le Chatelier's Principle
Part of Equilibrium (HT) · GCSE GCSE Chemistry revision
This topic summary covers Knowledge Organiser: Dynamic Equilibrium & Le Chatelier's Principle within Equilibrium (HT) for GCSE Chemistry. Revise Equilibrium (HT) in Rates of Reaction for GCSE Chemistry with 20 exam-style questions and 15 flashcards. This topic appears regularly enough that it should still be part of a steady revision cycle. It is section 14 of 14 in this topic. Use this topic summary to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 14 of 14
Practice
20 questions
Recall
15 flashcards
Knowledge Organiser: Dynamic Equilibrium & Le Chatelier's Principle
Key Terms
- Dynamic equilibrium — forward rate = backward rate
- Closed system — required for equilibrium
- Le Chatelier's Principle — system opposes change
- Equilibrium position — left (reactants) or right (products)
Le Chatelier Quick Rules
- Temp ↑ → endothermic direction
- Temp ↓ → exothermic direction
- Conc of reactant ↑ → shift right
- Pressure ↑ → fewer gas molecules side
- Catalyst → no shift (faster equilibrium)
Haber Process
- N₂ + 3H₂ ⇌ 2NH₃ (exothermic forward)
- Temperature: 450°C (compromise)
- Pressure: 200 atm (compromise)
- Catalyst: iron
- High P → more NH₃ (4→2 gas moles)
Common Exam Errors
- Saying equal concs at equilibrium
- Catalyst shifts equilibrium (wrong)
- Not counting gas molecules for pressure
- Missing "closed system" in definition
Key Equations
- N₂ + 3H₂ ⇌ 2NH₃ (Haber process — 4 gas moles → 2 gas moles)
- At equilibrium: rate of forward reaction = rate of reverse reaction
- Le Chatelier: system shifts to oppose any change imposed on it
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Read this section alongside the surrounding pages in Equilibrium (HT). That gives you the full topic sequence instead of a single isolated revision point.
Practice Questions for Equilibrium (HT)
At dynamic equilibrium, which of the following is true?
Explain the effect of increasing temperature on the position of an equilibrium where the forward reaction is exothermic.
Quick Recall Flashcards
20 questions on Equilibrium (HT) — practise free
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