Pearson Edexcel International GCSE in Chemistry · 4CH1 · Free · no account needed
Combustion and Carbonates — exam questions
12 original Incandio exam-style questions on Combustion and Carbonates, 26 marks, about 26 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 Combustion and Carbonates — 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
- Write (1–3 marks)
- the equation, formula or ionic equation, balanced, with state symbols where asked
- 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
- Suggest (1–3 marks)
- a plausible answer applying taught chemistry to an unfamiliar substance
- Identify (1–2 marks)
- the correct substance or feature selected from what is given
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 2.11 · 2.12 · 2.13. 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 — three elements burned in oxygen Element Flame seen Product magnesium brilliant white white powder hydrogen pale blue colourless liquid sulfur pale blue colourless choking gas (a)
(1)Identify
Identify the colourless liquid named in Table 1.
Table 1 — three elements burned in oxygen Element Flame seen Product magnesium brilliant white white powder hydrogen pale blue colourless liquid sulfur pale blue colourless choking gas (b)
(2)Give
Give the names of the products formed in the other two rows of Table 1.
Table 1 — three elements burned in oxygen Element Flame seen Product magnesium brilliant white white powder hydrogen pale blue colourless liquid sulfur pale blue colourless choking gas (c)
(3)Explain
Explain why the products in Table 1 are in three different states even though all three reactions are the same type.
Table 1 — three elements burned in oxygen Element Flame seen Product magnesium brilliant white white powder hydrogen pale blue colourless liquid sulfur pale blue colourless choking gas (d)
(3)Suggest
Suggest one environmental advantage and one environmental disadvantage of burning hydrogen rather than a fossil fuel, using Table 1.
Table 1 — three elements burned in oxygen Element Flame seen Product magnesium brilliant white white powder hydrogen pale blue colourless liquid sulfur pale blue colourless choking gas (Total for Question 1 = 9 marks)
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(1)Which
Which is formed when hydrogen burns in oxygen?
Product A hydrogen oxide powder B water C carbon dioxide D hydrogen peroxide (Total for Question 2 = 1 mark)
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(1)Name
Name the gas produced when sulfur burns in oxygen.
(Total for Question 3 = 1 mark)
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(1)Give
Give the name of the gas released when a metal carbonate is heated strongly.
(Total for Question 4 = 1 mark)
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(2)Describe
Describe what is seen when a piece of magnesium ribbon is burned in air.
(Total for Question 5 = 2 marks)
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(2)Write
Write the balanced symbol equation for the thermal decomposition of calcium carbonate.
(Total for Question 6 = 2 marks)
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(3)Explain
Explain how carbon dioxide in the atmosphere raises the temperature of the Earth's surface.
(Total for Question 7 = 3 marks)
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(3)Suggest
A student says that heating copper(II) carbonate is combustion because the solid changes colour and a gas is given off. Suggest why she is wrong.
(Total for Question 8 = 3 marks)
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(4)Explain
Explain why heating copper(II) carbonate and burning copper are both described as reactions with oxygen changing, yet only one of them takes oxygen from the air.
(Total for Question 9 = 4 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 Combustion and Carbonates to Ember, an AI pupil who does not have it yet and asks the awkward question.
- Defend it — argue it against Joseph Black over three rounds, marked against descriptors you can read first.
Completely free. No subscriptions, no paywalls, no account needed to start.
Back to the lesson
- Combustion and Carbonates — Three things burning in oxygen, one carbonate breaking apart, and the 0.04% gas that changes the climate.
- All of Incandio Chemistry · Incandio Exam Practice