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HomeCIE IGCSE ChemistryEnergy changes in chemical reactions (exothermic and endothermic)
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Energy changes in chemical reactions (exothermic and endothermic)
Practice Questions

20 CIE IGCSE Chemistry questions on Energy changes in chemical reactions (exothermic and endothermic), each with instant feedback and a full examiner-style mark scheme.

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Try 2 sample questions on Energy changes in chemical reactions (exothermic and endothermic)

Question 1 · 1 mark · Difficulty 1/3

Which of the following reactions is exothermic?

  1. Thermal decomposition of calcium carbonate
  2. Photosynthesis in plants
  3. Neutralisation of hydrochloric acid with sodium hydroxide
  4. Electrolysis of water
Show answer & explanation
✓ Answer: CNeutralisation of hydrochloric acid with sodium hydroxide
Award 1 mark for identifying neutralisation as exothermic. A is incorrect — thermal decomposition requires continuous heating and is endothermic. B is incorrect — photosynthesis absorbs energy from sunlight and is endothermic. D is incorrect — electrolysis requires electrical energy input and is endothermic.
Question 2 · 1 mark · Difficulty 2/3

A chemical company in Brazil uses self-heating cans for coffee. The can contains two compartments separated by a membrane. When the membrane is broken, calcium oxide reacts with water. CaO + H₂O → Ca(OH)₂ Why does this reaction heat the coffee?

  1. The reaction is endothermic and absorbs heat from the coffee
  2. The reaction is exothermic and releases heat to the coffee
  3. The calcium hydroxide produced has a higher temperature than the reactants
  4. The water evaporates and transfers heat to the coffee
Show answer & explanation
✓ Answer: BThe reaction is exothermic and releases heat to the coffee
Award 1 mark for identifying the reaction as exothermic with energy transfer to surroundings. A is incorrect — endothermic reactions would cool the coffee. C is incorrect — this confuses product properties with energy release. D is incorrect — the water reacts rather than evaporates.
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20 questions · 25 min · free

CIE IGCSE Chemistry: Energy changes in chemical reactions (exothermic and endothermic) FAQ

How many CIE IGCSE Chemistry questions on Energy changes in chemical reactions (exothermic and endothermic) are there on Kramizo?
Kramizo currently has 20 exam-board-aligned practice questions on Energy changes in chemical reactions (exothermic and endothermic) for CIE IGCSE 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 CIE 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 CIE IGCSE 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 Energy changes in chemical reactions (exothermic and endothermic) practice with other Chemistry topics or even switch to a totally different CIE 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 Energy changes in chemical reactions (exothermic and endothermic) questions aligned to the official CIE IGCSE Chemistry syllabus?
Every question is written against the published CIE IGCSE Chemistry specification, including the exact command words (state, describe, explain, calculate, evaluate, etc.), mark allocations, and difficulty tier you'd see on a real CIE 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 CIE.
How is Energy changes in chemical reactions (exothermic and endothermic) typically tested on CIE IGCSE Chemistry papers?
Energy changes in chemical reactions (exothermic and endothermic) appears across multiple question types on real CIE IGCSE 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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