AQA · Chemistry · 8462
GCSE Chemistry: Equilibrium
The rate and extent of chemical change · AQA GCSE Chemistry (8462), specification point 4.6.2.3. Cards are generated from the exam board's own specification for "Equilibrium", and every card links back to the page it came from. Specification © AQA — used with attribution.
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When is a reversible reaction said to have reached equilibrium?
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When the forward and reverse reactions occur at exactly the same rate.
Equilibrium is reached when the forward and reverse reactions occur at exactly the same ?.
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rate
What kind of apparatus is needed for a reversible reaction to reach equilibrium?
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A closed system — apparatus that prevents reactants and products from escaping.
Why must a reversible reaction be in a closed system to reach equilibrium?
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If reactants or products could escape, the forward and reverse reactions could never settle at equal rates.
Only a ? reaction can reach equilibrium.
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reversible
At equilibrium, do the forward and reverse reactions stop?
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No — both continue, but at exactly the same rate, so there is no overall change.
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