Adding a catalyst
2 marks · EasyA reversible reaction reaches equilibrium after 12 minutes. When a catalyst is added, it reaches equilibrium in just 3 minutes. Calculate by what factor the rate of reaching equilibrium has increased. State if the position of equilibrium is affected.
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Factor is 4; position of equilibrium is not affected.
Common mistakes: Multiplying, not dividing the times
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Marking points
M1 · 1 mark · Divides the original time by the new time (12/3 = 4).
A1 · 1 mark · States the position of equilibrium is unchanged.
Worked solution
The process is 4 times faster. The position of equilibrium does not change because the catalyst only affects the rate.