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
41–50 of 68 · Easy
Question 41
1 mark · Easy
Answer and see the solution →State what a catalyst does in a chemical reaction.
Question 42
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 43
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 44
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 45
1 mark · Easy
Answer and see the solution →Name the biological catalyst found in potatoes that speeds up the decomposition of hydrogen peroxide.
Question 46
3 marks · Easy
Answer and see the solution →(a)[1 mark]Write the word equation for the decomposition of hydrogen peroxide.
(b)[1 mark]Write the balanced symbol equation for this reaction.
(c)[1 mark]Explain why the catalyst is not shown among the reactants or products in these equations.
Question 47
2 marks · Easy
Answer and see the solution →If 0.20 g of manganese(IV) oxide is used to catalyse four separate 100 cm³ portions of hydrogen peroxide, how much manganese(IV) oxide will remain after all four reactions are completed?
Question 48
2 marks · Easy
Answer and see the solution →A student uses 0.10 g of a catalyst in a reaction and finds that at the end of the reaction the mass of the catalyst is still 0.10 g. The student repeats the experiment with another sample of the same catalyst, starting with 0.12 g, and measures the mass again after the reaction. Explain, using a calculation, what mass of the catalyst the student should expect to find at the end of the second experiment.
Question 49
1 mark · Easy
Answer and see the solution →State what a catalyst does to the activation energy, as shown on a reaction profile diagram.
Question 50
3 marks · Easy
Answer and see the solution →(a)[1 mark]Describe the energy change from reactants to products in an exothermic reaction profile diagram.
(b)[1 mark]On a reaction profile diagram, where is the activation energy shown?
(c)[1 mark]Explain how adding a catalyst would change the appearance of the reaction profile diagram.