Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
Changing the pressure on the reaction
19 practice questions
Practice questions
1–8 of 8 · Easy
Question 1
1 mark · Easy
Answer and see the solution →State what happens to the rate of a reaction between two gases when the pressure is increased.
Question 2
3 marks · Easy
Answer and see the solution →A student wants to increase the rate of a reaction involving only liquids. She decides to increase the pressure.
(a)[2 marks]Explain why this change in pressure will have little effect on the rate of reaction.
(b)[1 mark]Describe how the particles in a liquid are arranged.
Question 3
2 marks · Easy
Answer and see the solution →A 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.
Question 4
2 marks · Easy
Answer and see the solution →Explain why increasing the pressure does not significantly affect the rate of reaction for a reaction involving only solids.
Question 5
3 marks · Easy
Answer and see the solution →The table shows the completion time for a reaction between two gases at different pressures.
Reaction time at different pressures Pressure / kPa Completion time / min 80 20 160 10 240 6.7 (a)[1 mark]Describe the relationship between pressure and completion time for this reaction.
(b)[2 marks]Explain, using particle theory, why increasing the pressure causes this effect.
Question 6
1 mark · Easy
Answer and see the solution →State why changing the pressure has little effect on the rate of a reaction involving only liquids.
Question 7
3 marks · Easy
Answer and see the solution →Consider a reaction between two gases in a sealed container.
(a)[1 mark]Describe what happens to the rate of reaction if the pressure of the gases is increased.
(b)[2 marks]State why this happens, linking your answer to particle collisions.
Question 8
2 marks · Easy
Answer and see the solution →A student compresses a liquid to try to double the rate of reaction. The initial time taken for the reaction is 30 minutes. Calculate the likely time taken to complete the reaction after the pressure is doubled. Explain your answer.