The position of equilibrium

1 mark · Easy

In a reversible reaction in a sealed container, what happens to the concentrations of reactants and products at equilibrium?

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They remain constant (not equal).

Also accept: They stay the same; concentrations are constant

Common mistakes: They become equal; they stop changing because the reaction stops

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Marking points

B1 · 1 mark · States that the concentrations remain constant (not equal) at equilibrium.

Worked solution

At equilibrium, the concentrations of reactants and products remain constant (they do not change).