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Fuels: Fossil Fuels and Combustion
Practice Questions

20 CXC CSEC Chemistry questions on Fuels: Fossil Fuels and Combustion, each with instant feedback and a full examiner-style mark scheme.

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Try 2 sample questions on Fuels: Fossil Fuels and Combustion

Question 1 · 1 mark · Difficulty 1/3

A fishing vessel operating off the coast of Trinidad uses diesel fuel to power its engines. Diesel is classified as a fossil fuel because it is formed from:

  1. the decomposition of dead marine organisms over millions of years under high pressure and temperature
  2. the fermentation of sugar cane waste products in the absence of oxygen
  3. the distillation of crude petroleum at oil refineries
  4. the chemical reaction between carbon dioxide and water in the presence of sunlight
Show answer & explanation
✓ Answer: A — the decomposition of dead marine organisms over millions of years under high pressure and temperature
Award 1 mark for recognizing that fossil fuels are formed from dead organisms over millions of years under high pressure and temperature. B is incorrect because fermentation produces biofuels, not fossil fuels. C describes petroleum refining, which is a separation process, not the formation of fossil fuels. D is incorrect because this describes photosynthesis, not fossil fuel formation.
Question 2 · 1 mark · Difficulty 2/3

A student in Barbados conducted an experiment to compare the energy content of different fuels. She burned equal masses of ethanol, kerosene, and cooking oil under identical copper cans containing 100 cm³ of water. The kerosene raised the water temperature by 45°C, while ethanol raised it by 32°C. Which statement correctly explains this observation?

  1. Kerosene has a higher energy content per gram than ethanol
  2. Ethanol burns at a higher temperature than kerosene
  3. Kerosene molecules contain fewer carbon atoms than ethanol molecules
  4. Ethanol undergoes incomplete combustion while kerosene undergoes complete combustion
Show answer & explanation
✓ Answer: A — Kerosene has a higher energy content per gram than ethanol
Award 1 mark for recognizing that greater temperature rise indicates higher energy content per gram. B is incorrect because burning temperature does not determine energy content. C is incorrect because kerosene molecules actually contain more carbon atoms than ethanol. D is not supported by the evidence given and both can undergo complete combustion in excess oxygen.
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CXC CSEC Chemistry: Fuels: Fossil Fuels and Combustion FAQ

How many CXC CSEC Chemistry questions on Fuels: Fossil Fuels and Combustion are there on Kramizo?
Kramizo currently has 20 exam-board-aligned practice questions on Fuels: Fossil Fuels and Combustion for CXC CSEC Chemistry, with new questions added every week. Each question gives you instant feedback and a full examiner-style mark scheme that tells you exactly what would earn marks on a real CXC paper. The questions span the full difficulty range — from straightforward recall (level 1) right up to multi-step reasoning and evaluation (level 3) — so the bank works for first-pass revision and final exam-week stress testing alike.
Is Kramizo free for CXC CSEC students preparing for Chemistry?
Yes — completely free. Every student gets 45 questions a day on the free plan, with no card required and no trial countdown. That free quota works across every subject and every topic in our bank, so you can mix Fuels: Fossil Fuels and Combustion practice with other Chemistry topics or even switch to a totally different CXC subject without paying anything. Kramizo's optional Pro plan removes the daily cap and adds detailed progress analytics, but the free tier is the real product — used by thousands of GCSE, IGCSE and CSEC students.
Are the Fuels: Fossil Fuels and Combustion questions aligned to the official CXC CSEC Chemistry syllabus?
Every question is written against the published CXC CSEC Chemistry specification, including the exact command words (state, describe, explain, calculate, evaluate, etc.), mark allocations, and difficulty tier you'd see on a real CXC paper. Explanations are written in the style of official examiner mark schemes — they tell you what is being awarded marks and why distractors are wrong, not just whether you got it right. The bank is continually refined to match the latest syllabus updates from CXC.
How is Fuels: Fossil Fuels and Combustion typically tested on CXC CSEC Chemistry papers?
Fuels: Fossil Fuels and Combustion appears across multiple question types on real CXC CSEC Chemistry papers — most commonly as multiple-choice questions in the objective section, structured short-answer questions in the main paper, and occasionally as part of an extended response. Kramizo's practice bank reflects that mix: 4-option MCQs, true/false statements, fill-in-the-blank key terms, multi-select questions, and ordering questions. Working through the bank gives you exposure to every question style examiners actually use.

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