Changing the pressure on the reaction
2 marks · EasyA reaction between two gases at a certain pressure takes 16 minutes. When the pressure is doubled, the rate of reaction doubles. Calculate the new time taken for the reaction to complete at the higher pressure.
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8 minutes (±0.1)
Also accept: 8 min
Common mistakes: 32 minutes
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Marking points
M1 · 1 mark · Recognises that doubling the rate halves the time.
A1 · 1 mark · Correctly calculates the time as 8 minutes.
Worked solution
If the rate doubles, the reaction happens in half the time: 16 minutes ÷ 2 = 8 minutes.