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
121–130 of 163
Question 121
2 marks · Easy
Answer and see the solution →A steel railing has a surface area of 400 cm² and is to be protected from rusting by covering it with a thin layer of zinc (galvanising). If 0.15 g of zinc is needed to cover 100 cm², calculate the minimum mass of zinc needed to fully galvanise the railing. Give your answer to 2 decimal places.
Question 122
2 marks · Easy
Answer and see the solution →A metal sheet weighing 1.2 kg is coated by galvanising to prevent rusting. The layer of zinc adds 0.006 kg to its mass. Calculate the percentage increase in mass of the sheet after galvanising. Give your answer as a percentage to two decimal places.
Question 123
2 marks · Normal
Answer and see the solution →State the two conditions necessary for the rusting of iron.
Question 124
4 marks · Normal
Answer and see the solution →(a)[2 marks]Describe two ways to prevent iron from rusting.
(b)[2 marks]Explain why galvanising can still protect iron even if the zinc coating is scratched.
Question 125
3 marks · Normal
Answer and see the solution →Explain why covering iron with a plastic coat is less effective at preventing rust than galvanising, especially if the plastic is damaged.
Question 126
4 marks · Normal
Answer and see the solution →The table shows observations of iron nails kept under different conditions for two weeks.
Test tube Condition Rust observed after 2 weeks? A Nail in dry air (no water) No B Nail in boiled water, oil layer on top (no air) No C Nail in ordinary water, exposed to air Yes (a)[2 marks]Use the data to state the two conditions needed for rusting.
(b)[1 mark]Suggest why no rust formed in test tube B.
(c)[1 mark]Explain why rusting happened in test tube C.
Question 127
1 mark · Normal
Answer and check →Which statement best explains how galvanising prevents rusting of iron?
- A.Zinc forms a hard barrier that cannot be scratched.
- B.Zinc reacts with water to make rust.
- C.Zinc is more reactive than iron and corrodes first.
- D.Zinc keeps air away by making the iron heavier.
Question 128
2 marks · Normal
Answer and see the solution →State why rusting is more rapid in salty water than in pure water.
Question 129
4 marks · Normal
Answer and see the solution →A bicycle frame made from iron is left outside in the rain.
(a)[1 mark]State the two conditions required for rusting of iron to occur.
(b)[1 mark]Describe how painting the bicycle frame prevents rusting.
(c)[2 marks]Explain why coating the frame with zinc protects the iron even if the paint or zinc layer is scratched, using the idea of the reactivity series.
Question 130
2 marks · Normal
Answer and see the solution →State the two conditions necessary for iron to rust. Describe briefly how galvanising prevents rusting.