AQA GCSE Chemistry

Revision Notes

10.4.2 Dynamic Equilibrium

Higher Tier Only

Principles of Dynamic Equilibrium

  • Reaction conditions such as temperature and pressure affect the rate of a reaction
  • If the reaction is reversible then the position of equilibrium is also affected by changes in these conditions and often we must consider a trade-off between the rate of reaction and product yield
  • The graph below illustrates the effects of changing temperature and pressure on the yield of ammonia obtained
  • By following any of the curved lines on the graph it can be seen that as the pressure increases, so too does the yield at any given temperature
  • By following any vertical line upwards from the x-axis, the graph shows that as the temperature decreases, the yield actually increases
  • The actual conditions used must be chosen depending on a number of economical, chemical and practical considerations

Conditions for Haber process, IGCSE & GCSE Chemistry revision notes

The yield of ammonia produced changes with changes made to temperature and pressure

Exam Tip

Remember dynamic equilibrium only applies to a reversible reaction occurring in a closed vessel.

Author: Francesca

Fran has taught A level Chemistry in the UK for over 10 years. As head of science, she used her passion for education to drive improvement for staff and students, supporting them to achieve their full potential. Fran has also co-written science textbooks and worked as an examiner for UK exam boards.
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