Pearson Edexcel International GCSE in Chemistry · 4CH1 · Free · no account needed
Burning Fuels — exam questions
12 original Incandio exam-style questions on Burning Fuels, 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 Burning Fuels — 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
7 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
- State what is meant by (1–2 marks)
- the definition
- Give (1–2 marks)
- a short factual answer — the most common chemistry command
- 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 4.12 · 4.11 · 4.13. 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.
-
Table 1 — a gas burner run with its air hole in three positions Setting Air hole Flame colour Soot on a cold surface held in the flame 1 fully open blue none 2 half open blue with yellow tips a little 3 closed yellow a great deal (a)
(1)Identify
Identify the setting in Table 1 at which combustion is complete.
Table 1 — a gas burner run with its air hole in three positions Setting Air hole Flame colour Soot on a cold surface held in the flame 1 fully open blue none 2 half open blue with yellow tips a little 3 closed yellow a great deal (b)
(2)Explain
Explain what the soot column in Table 1 tells you about setting 3.
Table 1 — a gas burner run with its air hole in three positions Setting Air hole Flame colour Soot on a cold surface held in the flame 1 fully open blue none 2 half open blue with yellow tips a little 3 closed yellow a great deal (c)
(3)Explain
Explain, in terms of oxygen supply, why the flame changes as the air hole is closed.
Table 1 — a gas burner run with its air hole in three positions Setting Air hole Flame colour Soot on a cold surface held in the flame 1 fully open blue none 2 half open blue with yellow tips a little 3 closed yellow a great deal (d)
(3)Suggest
Setting 3 produces visible soot, but setting 2 produces something more dangerous that cannot be seen. Suggest what, and why the table gives no sign of it.
Table 1 — a gas burner run with its air hole in three positions Setting Air hole Flame colour Soot on a cold surface held in the flame 1 fully open blue none 2 half open blue with yellow tips a little 3 closed yellow a great deal (Total for Question 1 = 9 marks)
-
(1)Which
Which pair of products is formed by the complete combustion of a hydrocarbon?
Products A carbon monoxide and water B carbon dioxide and water C carbon and hydrogen D carbon dioxide and hydrogen (Total for Question 2 = 1 mark)
-
(1)State what is meant by
State what is meant by a fuel.
(Total for Question 3 = 1 mark)
-
(1)Give
Give the condition that causes incomplete combustion.
(Total for Question 4 = 1 mark)
-
(2)Write
Write the balanced symbol equation for the complete combustion of methane, CH₄.
(Total for Question 5 = 2 marks)
-
(3)Explain
Explain why carbon monoxide is poisonous.
(Total for Question 6 = 3 marks)
-
(2)Explain
Explain why a yellow, sooty flame gives out less heat than a blue one from the same fuel.
(Total for Question 7 = 2 marks)
-
(3)Suggest
Suggest why a gas heater used in an unventilated room is far more dangerous than the same heater used with a window open.
(Total for Question 8 = 3 marks)
-
(4)Explain
Explain why a gas heater burning methane is dangerous in a room with no ventilation.
(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 Burning Fuels to Ember, an AI pupil who does not have it yet and asks the awkward question.
- Defend it — argue it against Robert Bunsen 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
- Burning Fuels — Two ways a hydrocarbon can burn, and why one of them fills a room with a gas you cannot smell.
- All of Incandio Chemistry · Incandio Exam Practice