Changing the pressure on the reaction
3 marks · NormalA reaction between two gases at 100 kPa takes 10 minutes to complete. If the pressure is increased to 200 kPa, assume the rate doubles. Calculate the new time for the reaction to complete.
Show your working.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
Show answer
5 minutes (±0.1)
Common mistakes: Dividing by 2 incorrectly; Multiplying time by 2
Show mark scheme and worked solution
Marking points
M1 · 1 mark · States or uses correct relationship: if rate doubles, time halves.
M2 · 1 mark · Writes or rearranges the formula (new time = original time / 2).
A1 · 1 mark · Arrives at final answer: 5 minutes (with correct units). (follow-through)
Worked solution
If rate doubles, time taken is halved.