Pearson Edexcel International GCSE in Chemistry · 4CH1 · Free · no account needed
Rusting and its Prevention — exam questions
12 original Incandio exam-style questions on Rusting and its Prevention, 27 marks, about 27 minutes of writing. Each one carries the command word, the tariff and the specification statement it assesses, exactly as a paper presents them. This is an original Incandio practice question, written to reflect the structure and demands of the qualification. It is not an official Pearson Edexcel past-paper question.
This is the practice set for Rusting and its Prevention — the lesson that teaches it. Read the lesson first if the idea is new; come here when you want to find out whether you can turn it into marks. Completely free, no account needed to read.
What these questions ask of you
8 command words run through this set, and on Pearson Edexcel International GCSE Chemistry each one means something precise. Answering the wrong command is the commonest way a candidate who understands the lesson still loses the mark.
- Which (1 mark)
- one option chosen from the set given
- Name (1 mark)
- the correct chemical name
- Give (1–2 marks)
- a short factual answer — the most common chemistry command
- Describe (2–5 marks)
- developed, linked statements of what happens or what is observed Misread as: giving one bare observation where the tariff asked for a developed account
- Explain (2–4 marks)
- the reason, in terms of particles, bonding, energy or equilibrium Misread as: describing the observation without giving the chemistry that causes it
- Compare (2–4 marks)
- explicit comparison with a comparative word — a bare pair of statements is not a comparison
- Suggest (1–3 marks)
- a plausible answer applying taught chemistry to an unfamiliar substance
- State (1 mark)
- one precise fact, no justification
Assessed on Paper 1 (4CH1/1C) and Paper 2 (4CH1/2C), against AO1, AO2, AO3.
Where these sit in the specification
Pearson Edexcel International GCSE Chemistry (4CH1) — statements 2.18 · 2.19. Incandio is aligned to this specification; it is not published by, endorsed by or affiliated with Pearson, and it reproduces none of Pearson's wording.
The 12 questions
Answer them on paper, then open the lesson's exam practice to have them marked. The mark scheme, the accepted and rejected answers and the annotated model answer are in Incandio and are not printed here — an answer beside its question is not practice.
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Table 1 — iron nails left for one week in four sealed test tubes Tube What the nail was in Result after one week 1 tap water, open to the air heavily rusted 2 water that had been boiled, sealed under oil no rust 3 dry air, with a drying agent in the tube no rust 4 tap water, open to the air, with a strip of zinc wrapped round the nail no rust on the nail (a)
(1)State
State which tube in Table 1 provides the comparison for the other three.
Table 1 — iron nails left for one week in four sealed test tubes Tube What the nail was in Result after one week 1 tap water, open to the air heavily rusted 2 water that had been boiled, sealed under oil no rust 3 dry air, with a drying agent in the tube no rust 4 tap water, open to the air, with a strip of zinc wrapped round the nail no rust on the nail (b)
(2)Explain
Explain what tubes 2 and 3 together show about the conditions needed for rusting.
Table 1 — iron nails left for one week in four sealed test tubes Tube What the nail was in Result after one week 1 tap water, open to the air heavily rusted 2 water that had been boiled, sealed under oil no rust 3 dry air, with a drying agent in the tube no rust 4 tap water, open to the air, with a strip of zinc wrapped round the nail no rust on the nail (c)
(3)Explain
Explain why the nail in tube 4 did not rust, although it was in the same conditions as tube 1.
Table 1 — iron nails left for one week in four sealed test tubes Tube What the nail was in Result after one week 1 tap water, open to the air heavily rusted 2 water that had been boiled, sealed under oil no rust 3 dry air, with a drying agent in the tube no rust 4 tap water, open to the air, with a strip of zinc wrapped round the nail no rust on the nail (d)
(3)Suggest
Suggest one change to the experiment in Table 1 that would let the student measure how fast rusting happens rather than only whether it happens.
Table 1 — iron nails left for one week in four sealed test tubes Tube What the nail was in Result after one week 1 tap water, open to the air heavily rusted 2 water that had been boiled, sealed under oil no rust 3 dry air, with a drying agent in the tube no rust 4 tap water, open to the air, with a strip of zinc wrapped round the nail no rust on the nail (Total for Question 1 = 9 marks)
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(1)Which
Which two substances must both be present for iron to rust?
Substances A oxygen and water B oxygen and carbon dioxide C water and nitrogen D carbon dioxide and water (Total for Question 2 = 1 mark)
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(1)Name
Name the compound that rust mainly consists of.
(Total for Question 3 = 1 mark)
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(1)Give
Give one method of preventing rusting that works by forming a barrier.
(Total for Question 4 = 1 mark)
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(2)Describe
Describe what is meant by galvanising.
(Total for Question 5 = 2 marks)
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(3)Explain
Explain how blocks of magnesium bolted to the steel hull of a ship stop the hull from rusting.
(Total for Question 6 = 3 marks)
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(2)Compare
Compare how painting and sacrificial protection each keep iron from rusting.
(Total for Question 7 = 2 marks)
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(3)Suggest
A tin-plated steel can rusts faster once it is scratched than an unplated one does. Suggest why.
(Total for Question 8 = 3 marks)
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(5)Describe
Describe an experiment using three test tubes that would show that both air and water are needed for iron to rust.
(Total for Question 9 = 5 marks)
Have them marked, then defend the answer
Practice tells you the mark; teaching it back tells you whether you understand it. On Incandio a topic counts as mastered only once you have taught it and defended it.
- Mark these questions — 12 questions, marked on Incandio against the authored scheme, with the mistake you actually made named.
- Teach it — explain Rusting and its Prevention to Ember, an AI pupil who does not have it yet and asks the awkward question.
- Defend it — argue it against Humphry Davy over three rounds, marked against descriptors you can read first.
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Back to the lesson
- Rusting and its Prevention — Two things are needed to rust iron, and every method of stopping it removes one of them — or cheats.
- All of Incandio Chemistry · Incandio Exam Practice