Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
What are catalysts?
19 practice questions
Practice questions
1–3 of 3 · Hard
Question 1
2 marks · Hard
Answer and see the solution →State two features that are always true for catalysts when used in a chemical reaction.
Question 2
5 marks · Hard
Answer and see the solution →A student investigates the reaction below:
(a)[2 marks]Describe how the student could show that manganese(IV) oxide acts as a catalyst in this reaction.
(b)[2 marks]After the reaction, the student filters, dries, and reweighs the manganese(IV) oxide. The mass is unchanged. Explain why this result supports the conclusion that manganese(IV) oxide is a catalyst.
(c)[1 mark]State why only a small amount of catalyst is usually needed for a reaction.
Question 3
2 marks · Hard
Answer and see the solution →Explain why the same catalyst cannot usually be used for every type of chemical reaction.