Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
Preventing rusting by using sacrificial protection
18 practice questions
Practice questions
1–3 of 3 · Hard
Question 1
2 marks · Hard
Answer and see the solution →Explain why a block of copper cannot be used as a sacrificial anode to protect iron from rusting.
Question 2
5 marks · Hard
Answer and see the solution →An engineer is tasked with protecting an iron pipeline buried underground using the method of sacrificial protection.
(a)[2 marks]Explain why sacrificial anodes must be made of a metal more reactive than iron.
(b)[2 marks]The engineer is considering aluminium, tin, and silver as possible metals for sacrificial anodes. Aluminium is above iron in the reactivity series, tin is just below iron, and silver is far below iron. Which of these metals could be used as sacrificial anodes for the pipeline? Justify your choice.
(c)[1 mark]Describe what happens to the chosen sacrificial anode metal over time.
Question 3
2 marks · Hard
Answer and see the solution →State one example of a structure (not previously listed in examples) that can be protected from rusting using sacrificial anodes, and name a suitable metal that could be used as the sacrificial anode for this structure.