GCSE Chemistry, Unit 6, Lesson 5 of 7
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Reversible reactions and dynamic equilibrium

GCSE Chemistry, Rates of reaction and equilibrium, 20 minutes

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Reactions that go both ways, the energy they transfer each way, and what equilibrium in a closed system means.

Reactions that go both ways

In a reversible reaction the products can react to make the reactants again.

The symbol is ⇌.

A + B ⇌ C + D

  • Heat white ammonium chloride: it breaks down into ammonia and hydrogen chloride. Near the cool top of the tube they join up again as a white solid.
  • Changing the conditions can change which direction wins.

The rest of this lesson and its 7 practice questions are in Plus.

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  • 7 exam-style questions, marked as you go, each with a worked solution
  • Anything you get wrong is saved to your flashcards