Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Chapter
Rates of Reaction
164 practice questions
Topics covered
- Experiments to measure the rate of reaction19 practice questions
- Explaining what's happening19 practice questions
- Changing the surface area of the reactants19 practice questions
- Changing the concentration of the reactants19 practice questions
- Changing the pressure on the reaction19 practice questions
- What are catalysts?19 practice questions
- How does a catalyst work?20 practice questions
- Catalysts in industry19 practice questions
Practice questions
91–100 of 164
Question 91
2 marks · Normal
Answer and see the solution →Describe the effect of increasing the pressure on a reaction between two gases, and link your answer to particle collisions.
Question 92
4 marks · Normal
Answer and see the solution →(a)[1 mark]State whether changing the pressure has a significant effect on the rate of reaction for solids or liquids.
(b)[2 marks]Describe the arrangement of particles in solids and in liquids.
(c)[1 mark]Explain, using your answer to (b), why pressure does not change the rate much for solids and liquids.
Question 93
2 marks · Hard
Answer and see the solution →A chemical reaction between nitrogen and hydrogen gases is taking place in a sealed vessel. The pressure inside the vessel is increased while the temperature remains constant.
Describe and explain what happens to the rate of reaction when the pressure is increased.
Question 94
5 marks · Hard
Answer and see the solution →A student investigates the effect of pressure on two reactions:
(a)[3 marks]Reaction 1: Two solid powders are mixed together in a sealed container. Predict what happens to the rate of reaction if the pressure is increased. Explain your answer using particle theory.
(b)[2 marks]Reaction 2: Two liquids are mixed together. Explain, using your knowledge of particle arrangement, why increasing the pressure has little effect on the rate of reaction.
Question 95
2 marks · Hard
Answer and see the solution →A reaction takes place between two gases. The pressure is increased by decreasing the volume of the container.
Explain why this leads to a faster reaction rate, using ideas about particle collisions.
Question 96
1 mark · Easy
Answer and see the solution →State what a catalyst does in a chemical reaction.
Question 97
3 marks · Easy
Answer and see the solution →(a)[1 mark]Describe what happens to a catalyst at the end of a chemical reaction.
(b)[1 mark]Explain why only a small amount of catalyst is needed to speed up a reaction.
(c)[1 mark]Different reactions require different catalysts. Give one reason for this.
Question 98
2 marks · Easy
Answer and see the solution →Explain why a catalyst is not included in the balanced chemical equation for a reaction, even though it is present and important during the reaction.
Question 99
3 marks · Easy
Answer and see the solution →(a)[1 mark]Oxygen collected (cm³) from decomposition of hydrogen peroxide over 60 seconds using solid W, X, or Y as a catalyst. Solid Oxygen Produced (cm³) W 24 X 2 Y 0 Which solid appears to be the most effective catalyst for this reaction?
(b)[1 mark]Suggest which solid does not act as a catalyst in this reaction.
(c)[1 mark]Give a reason for your answer to part (b).
Question 100
1 mark · Easy
Answer and see the solution →Name the biological catalyst found in potatoes that speeds up the decomposition of hydrogen peroxide.