Key Facts: Bond Energies
This key facts covers Key Facts: Bond Energies within Bond Energies (HT) for GCSE Chemistry. Revise Bond Energies (HT) in Energy Changes for GCSE Chemistry with 25 exam-style questions and 15 flashcards. This topic appears regularly enough that it should still be part of a steady revision cycle. It is section 9 of 15 in this topic. Use this key facts to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 9 of 15
Practice
25 questions
Recall
15 flashcards
📌 Key Facts: Bond Energies
- Bond energy = energy needed to break 1 mole of a particular bond
- Units are kJ/mol (kilojoules per mole)
- Breaking bonds is ALWAYS endothermic (requires energy)
- Making bonds is ALWAYS exothermic (releases energy)
- If breaking > making: reaction is endothermic, ΔH positive
- If making > breaking: reaction is exothermic, ΔH negative
- Double bonds (C=C, O=O) have higher bond energy than single bonds
- Triple bonds (N≡N) are even stronger
Keep building this topic
Read this section alongside the surrounding pages in Bond Energies (HT). That gives you the full topic sequence instead of a single isolated revision point.
Practice Questions for Bond Energies (HT)
Which statement correctly describes the energy change when chemical bonds are broken?
Explain how you would determine, from a bond energy calculation, whether a reaction is exothermic or endothermic.
Quick Recall Flashcards
25 questions on Bond Energies (HT) — practise free
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