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
101–110 of 164
Question 101
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 102
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 103
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 104
2 marks · Normal
Answer and see the solution →State what a catalyst is and explain why the same catalyst can be used again in another reaction of the same type.
Question 105
4 marks · Normal
Answer and see the solution →(a)[2 marks]Write a word equation and a balanced symbol equation for the catalytic decomposition of hydrogen peroxide.
(b)[2 marks]Explain why manganese(IV) oxide is described as a catalyst in this reaction.
Question 106
3 marks · Normal
Answer and see the solution →Explain, with reasons, how you could show experimentally that manganese(IV) oxide is not chemically changed during the decomposition of hydrogen peroxide.
Question 107
4 marks · Normal
Answer and see the solution →The table shows the volume of oxygen gas collected over 60 seconds when hydrogen peroxide is decomposed using three different solids as potential catalysts. The experiment used the same conditions (temperature, concentration, volumes).
Oxygen collected over time Time (s) MnO2 (cm³) PbO2 (cm³) CuO (cm³) 0 0 0 0 20 24 8 0 40 36 13 0 60 40 16 0 (a)[2 marks]Compare the effectiveness of the three solids as catalysts for this reaction.
(b)[2 marks]Using evidence from the data, explain your answer.
Question 108
1 mark · Normal
Answer and check →Which statement best describes the role of a catalyst?
- A.A catalyst increases the rate of a reaction and is chemically unchanged at the end.
- B.A catalyst is used up during the reaction.
- C.A catalyst stops chemical reactions from taking place.
- D.A catalyst increases the yield of products in a reaction.
Question 109
2 marks · Normal
Answer and see the solution →Give two reasons why catalysts are important in industrial chemical processes.
Question 110
4 marks · Normal
Answer and see the solution →(a)[2 marks]Describe how you would set up an experiment to measure the effect of different solid catalysts on the rate of decomposition of hydrogen peroxide.
(b)[1 mark]State one safety precaution you would take when carrying out this experiment.
(c)[1 mark]What result would show that a solid is not a catalyst for this reaction?