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Bond energies and enthalpy calculations
Practice Questions

20 CIE IGCSE Chemistry questions on Bond energies and enthalpy calculations, each with instant feedback and a full examiner-style mark scheme.

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Try 2 sample questions on Bond energies and enthalpy calculations

Question 1 · 1 mark · Difficulty 1/3

Which statement correctly describes bond energy?

  1. A: The energy released when one mole of bonds is formed in a gaseous molecule
  2. B: The energy required to break one mole of a specific covalent bond in gaseous molecules
  3. C: The total energy stored in all bonds of one mole of a compound
  4. D: The energy needed to convert one mole of a liquid into a gas
Show answer & explanation
✓ Answer: B — B: The energy required to break one mole of a specific covalent bond in gaseous molecules
Bond energy is defined as the energy required to break one mole of a specific covalent bond in gaseous molecules under standard conditions. It is always endothermic (positive) since breaking bonds requires energy input. Students often confuse bond breaking with bond forming, which releases energy.
Question 2 · 1 mark · Difficulty 2/3

Using the bond energies below, what is the enthalpy change for the reaction H₂ + Cl₂ → 2HCl? H–H: 436 kJ/mol, Cl–Cl: 242 kJ/mol, H–Cl: 431 kJ/mol

  1. A: −184 kJ/mol
  2. B: +184 kJ/mol
  3. C: −862 kJ/mol
  4. D: +678 kJ/mol
Show answer & explanation
✓ Answer: A — A: −184 kJ/mol
Energy in (breaking bonds): 436 + 242 = 678 kJ/mol. Energy out (forming bonds): 2 × 431 = 862 kJ/mol. ΔH = 678 − 862 = −184 kJ/mol. The negative sign confirms the reaction is exothermic. Students commonly forget to multiply the H–Cl bond energy by 2.
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CIE IGCSE Chemistry: Bond energies and enthalpy calculations FAQ

How many CIE IGCSE Chemistry questions on Bond energies and enthalpy calculations are there on Kramizo?
Kramizo currently has 20 exam-board-aligned practice questions on Bond energies and enthalpy calculations 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 Bond energies and enthalpy calculations 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 Bond energies and enthalpy calculations 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 Bond energies and enthalpy calculations typically tested on CIE IGCSE Chemistry papers?
Bond energies and enthalpy calculations 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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