Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Chapter
Reactivity Series
163 practice questions
Topics covered
- Displacement reactions involving metal oxides20 practice questions
- Oxidation and reduction19 practice questions
- Displacement reactions involving solutions of salts19 practice questions
- Reactions of metals with water18 practice questions
- Reactions of metals with dilute acids19 practice questions
- Making predictions using the reactivity series19 practice questions
- Preventing rusting by galvanising21 practice questions
- Preventing rusting by using sacrificial protection18 practice questions
Practice questions
131–140 of 163
Question 131
4 marks · Normal
Answer and see the solution →A farmer is installing a new iron gate that will be exposed to rain and air.
(a)[1 mark]Explain why the gate will rust if left unprotected.
(b)[2 marks]Describe two ways, other than galvanising, that could prevent the gate from rusting.
(c)[1 mark]State and explain why galvanising remains effective even if the zinc coating is scratched.
Question 132
3 marks · Normal
Answer and see the solution →A section of iron gutter is to be protected from rusting by galvanising. The gutter is 2.5 m long and each square metre of iron requires 80 g of zinc for an even, protective coating.
(a)[1 mark]State the two conditions required for rusting of iron to occur.
(b)[2 marks]The gutter has a surface area of 0.30 m². Calculate the minimum mass of zinc needed to galvanise the entire surface. Show your working and give your answer in grams.
Question 133
2 marks · Hard
Answer and see the solution →State the two conditions necessary for iron to rust. Explain why covering iron with zinc prevents rusting, even if the zinc layer is scratched.
Question 134
5 marks · Hard
Answer and see the solution →The diagram shows an iron pipe exposed outdoors. The owner wants to protect it from rusting using galvanising.
(a)[2 marks]Describe the process of galvanising as a method of preventing rusting.
(b)[2 marks]Explain why the pipe does not rust even if the zinc coating is damaged in places.
(c)[1 mark]State one other method, apart from galvanising, that could be used to prevent the pipe from rusting, and explain how it works.
Question 135
2 marks · Hard
Answer and see the solution →A steel beam is coated with zinc to prevent rusting. Explain why salty water increases the rate of rusting if the zinc coating is damaged.
Question 136
1 mark · Easy
Answer and see the solution →State one example of a structure that is protected from rusting using sacrificial anodes.
Question 137
3 marks · Easy
Answer and see the solution →Iron pipes used in water supply networks are often fitted with zinc blocks to prevent rusting.
(a)[1 mark]Describe what happens to the zinc block over time.
(b)[2 marks]Explain how the zinc block prevents the iron pipe from rusting.
Question 138
2 marks · Easy
Answer and see the solution →A large storage tank for water is made of steel and is buried underground. Magnesium blocks are attached to its surface.
Explain why magnesium is a suitable choice to protect the tank and suggest one other metal that could be used for this purpose.
Question 139
3 marks · Easy
Answer and see the solution →The table shows how the mass of a zinc sacrificial anode attached to an iron structure changes over four years.
Year Mass of zinc anode (g) 0 500 1 425 2 355 3 295 4 240 (a)[1 mark]State the decrease in mass of the zinc anode during the second year (from year 1 to year 2).
(b)[1 mark]Explain why the zinc anode loses mass over time.
(c)[1 mark]Describe how this process protects the iron structure from rusting.
Question 140
1 mark · Easy
Answer and see the solution →State why a sacrificial anode used to protect iron must be more reactive than iron.