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AQA · GCSE · Chemistry · Higher

Dynamic equilibrium reaction description

Q03.2 1 mark

Water molecules break down into hydrogen ions and hydroxide ions. The equation for the reaction is:

H2O⇌H++OH−\mathrm{H_2O \rightleftharpoons H^+ + OH^-}

Which sentence describes this reaction at equilibrium? Tick one box.

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Marking points

  1. 1 Selects the statement that water molecules break down and reform at the same rate.

Why this answer loses marks

At equilibrium all particles stop reacting.

Equilibrium is dynamic: both directions continue, with equal rates rather than no reactions.

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