IGCSE Practice

Cambridge IGCSE·Co-ordinated Sciences 0654·Chemistry Exothermic Endothermic Reactions
📋Key knowledge — Chemical Energetics

Formulas & equations

  • q = mcΔT (energy = mass × specific heat capacity × temperature change)
  • ΔH = energy of bonds broken − energy of bonds formed (endothermic if positive)

Key facts & rules

  • Exothermic reaction: releases energy to surroundings → temperature rises. Products have less energy than reactants.
  • Endothermic reaction: absorbs energy from surroundings → temperature falls. Products have more energy than reactants.
  • Activation energy: minimum energy needed for a reaction to occur.
  • Catalyst: lowers activation energy → increases reaction rate without being consumed.
  • Bond breaking: endothermic (energy input needed). Bond forming: exothermic (energy released).
  • If bonds broken > bonds formed (energy): overall endothermic.
  • Energy level diagram: reactants → transition state (Ea peak) → products.

IGCSE Chemistry — Exothermic & endothermic reactions

39 Cambridge IGCSE 0654 questions on exothermic & endothermic reactions, across all three components.

About exothermic & endothermic reactions on IGCSE 0654

Every Cambridge IGCSE Co-ordinated Sciences 0654 question on exothermic & endothermic reactions (Chemical energetics, Chemistry), across all three exam components. Theory and alternative-to-practical come with full mark schemes; multiple choice is interactive — click an option to check it.

Theory

Papers 3 & 4 · 5 questions · Structured written questions, each with its full mark scheme.
Exothermic & endothermic reactions — Core theory questions2 total · Paper 3

Exercise 1 — IGCSE 0654 Jun 2024 Paper 32 Q5

Cambridge past paperCore11 marks Paper 32Jun 2024
IGCSE 0654 Jun 2024 Paper 32 Question 5 — Exothermic & endothermic reactions
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Mark scheme for IGCSE 0654 Jun 2024 Paper 32 Q5

Exercise 2 — IGCSE 0654 Jun 2024 Paper 33 Q5

Cambridge past paperCore11 marks Paper 33Jun 2024
IGCSE 0654 Jun 2024 Paper 33 Question 5 — Exothermic & endothermic reactions
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Mark scheme for IGCSE 0654 Jun 2024 Paper 33 Q5
Exothermic & endothermic reactions — Extended theory questions3 total · Paper 4

Exercise 3 — IGCSE 0654 Nov 2025 Paper 43 Q7

Cambridge past paperExtended9 marks Paper 43Nov 2025
IGCSE 0654 Nov 2025 Paper 43 Question 7 — Exothermic & endothermic reactions
Show mark scheme
Mark scheme for IGCSE 0654 Nov 2025 Paper 43 Q7

Exercise 4 — IGCSE 0654 Jun 2023 Paper 42 Q5

Cambridge past paperExtended11 marks Paper 42Jun 2023
IGCSE 0654 Jun 2023 Paper 42 Question 5 — Exothermic & endothermic reactions
Show mark scheme
Mark scheme for IGCSE 0654 Jun 2023 Paper 42 Q5

Exercise 5 — IGCSE 0654 Nov 2022 Paper 43 Q2

Cambridge past paperExtended9 marks Paper 43Nov 2022
IGCSE 0654 Nov 2022 Paper 43 Question 2 — Exothermic & endothermic reactions
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Mark scheme for IGCSE 0654 Nov 2022 Paper 43 Q2
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Multiple choice

Papers 1 & 2 · 34 questions · Click an option (A–D) to check your answer instantly.
Exothermic & endothermic reactions — Core multiple choice questions22 total · Paper 1

Exercise 1 — IGCSE 0654 May/June 2025 Paper 11 Q20

Cambridge past paperCore1 mark Paper 11May/June 2025
IGCSE 0654 May/June 2025 Paper 11 Question 20 — Exothermic & endothermic reactions
Show answer
Correct answer: D

Exercise 2 — IGCSE 0654 Oct/Nov 2025 Paper 11 Q20

Cambridge past paperCore1 mark Paper 11Oct/Nov 2025
IGCSE 0654 Oct/Nov 2025 Paper 11 Question 20 — Exothermic & endothermic reactions
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Correct answer: D

Exercise 3 — IGCSE 0654 March 2025 Paper 12 Q20

Cambridge past paperCore1 mark Paper 12March 2025
IGCSE 0654 March 2025 Paper 12 Question 20 — Exothermic & endothermic reactions
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Correct answer: D

Exercise 4 — IGCSE 0654 May/June 2024 Paper 11 Q19

Cambridge past paperCore1 mark Paper 11May/June 2024
IGCSE 0654 May/June 2024 Paper 11 Question 19 — Exothermic & endothermic reactions
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Correct answer: B
Exothermic & endothermic reactions — Extended multiple choice questions12 total · Paper 2

Exercise 5 — IGCSE 0654 May/June 2025 Paper 22 Q16

Cambridge past paperExtended1 mark Paper 22May/June 2025
IGCSE 0654 May/June 2025 Paper 22 Question 16 — Exothermic & endothermic reactions
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Correct answer: C

Exercise 6 — IGCSE 0654 Oct/Nov 2025 Paper 22 Q22

Cambridge past paperExtended1 mark Paper 22Oct/Nov 2025
IGCSE 0654 Oct/Nov 2025 Paper 22 Question 22 — Exothermic & endothermic reactions
Show answer
Correct answer: D

Exercise 7 — IGCSE 0654 Oct/Nov 2024 Paper 21 Q19

Cambridge past paperExtended1 mark Paper 21Oct/Nov 2024
IGCSE 0654 Oct/Nov 2024 Paper 21 Question 19 — Exothermic & endothermic reactions
Show answer
Correct answer: B

Exercise 8 — IGCSE 0654 May/June 2024 Paper 21 Q20

Cambridge past paperExtended1 mark Paper 21May/June 2024
IGCSE 0654 May/June 2024 Paper 21 Question 20 — Exothermic & endothermic reactions
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Correct answer: D
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