Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
What are catalysts?
19 practice questions
Practice questions
1–8 of 8 · Easy
Question 1
1 mark · Easy
Answer and see the solution →State what a catalyst does in a chemical reaction.
Question 2
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 3
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 4
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 5
1 mark · Easy
Answer and see the solution →Name the biological catalyst found in potatoes that speeds up the decomposition of hydrogen peroxide.
Question 6
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 7
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 8
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.