The effect of concentration
2 marks · NormalThe equation represents a reversible reaction at equilibrium. State and explain the effect on the position of equilibrium if C(g) is removed as soon as it forms.
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Equilibrium shifts right to replace the C removed, so more B and C are formed.
Also accept: Equilibrium moves to the right to make more C and B
Common mistakes: Shifts left; No explanation for the shift
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Marking points
M1 · 1 mark · States equilibrium shifts right/to products.
M2 · 1 mark · Explains shift is to replace C being removed.
Worked solution
Removing C(g) reduces its concentration. The equilibrium shifts right to replace the C that is removed, so more B and C are produced.