Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Unit
Inorganic Chemistry
869 practice questions
Topics covered
- The Alkali Metals85 practice questions
- The Halogens86 practice questions
- Gases in the Atmosphere86 practice questions
- Reactivity Series163 practice questions
- Extraction and Uses of Metals128 practice questions
- Acids, Alkalis and Titrations83 practice questions
- Acids, Bases and Salt Preparations156 practice questions
- Chemical Tests68 practice questions
Practice questions
401–410 of 869
Question 401
4 marks · Normal
Answer and see the solution →The diagram shows an iron pipeline buried underground with blocks of magnesium attached at intervals.
(a)[2 marks]Explain why the magnesium blocks must be more reactive than iron in order to protect the pipeline from rusting.
(b)[2 marks]Explain what happens to the magnesium during this process.
Question 402
3 marks · Normal
Answer and see the solution →A ship’s iron hull is protected from rusting by sacrificial anodes. Each anode is made from magnesium and has a mass of 6 kg. Over a year, each anode loses 1.5 kg of magnesium.
(a)[1 mark]State one structure, apart from a ship, that is protected by sacrificial anodes.
(b)[2 marks]Calculate the percentage of magnesium lost from each anode in a year.
Question 403
3 marks · Normal
Answer and see the solution →Rusting occurs when iron is exposed to air and water. Ships are often fitted with blocks of zinc on their hulls.
(a)[3 marks]Explain, using the ideas of oxidation and reactivity, how these zinc blocks prevent the iron hull from rusting.
Question 404
4 marks · Normal
Answer and see the solution →A scientist is choosing a metal to protect an iron water tank from rusting. She tests three metals (A, B, and C), each attached to iron and left in moist air. The results are shown below.
Results: Rusting of iron with different metals attached Metal attached Observation after 1 month A Iron is rusted; attached metal is not corroded B Iron is shiny; attached metal is heavily corroded C Iron is rusted; attached metal is also rusted (a)[2 marks]Which metal, A, B, or C, acts as a sacrificial anode for iron? Explain your answer.
(b)[2 marks]Explain, using the observations, why the chosen metal must be more reactive than iron.
Question 405
1 mark · Normal
Answer and check →Which structure is commonly protected using sacrificial anodes made of zinc or magnesium?
- A.Aluminium can
- B.Underground oil pipeline
- C.Plastic water bottle
- D.Glass window
Question 406
2 marks · Normal
Answer and see the solution →State what is meant by a sacrificial anode, and name a metal commonly used as one to protect iron.
Question 407
4 marks · Normal
Answer and see the solution →A section of an underwater steel bridge has several aluminium blocks attached to it.
(a)[2 marks]Explain why aluminium is able to protect the steel from rusting by sacrificial protection.
(b)[2 marks]Describe what happens to the aluminium blocks over time and why they are eventually replaced.
Question 408
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 409
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 410
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.