Bond Energy
3 guided lessons · 27 checks · 3. Physical Chemistry → Energetics
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Breaking costs, making pays
Every bond is a spring with a price tag: pulling it apart costs energy, snapping it shut pays energy back. This lesson fixes which half of the reaction spends and which one earns.
What you know already
From Energy Level Diagrams you already know how the product level sits below or above the reactant level. This note explains those levels with bonds: breaking costs energy and making pays it back. It finishes by pricing every bond in a reaction to calculate the enthalpy change from scratch.
Key points of understanding
- Bond-breaking is an endothermic process because energy must be taken in to break bonds.
- Bond-making is an exothermic process because energy is released when new bonds are formed.
- Whether a reaction is exothermic or endothermic overall depends on the balance between breaking and making.
- Each chemical bond has a specific bond energy for breaking it or forming it.
- Bond energies are usually quoted in kilojoules per mole of bonds.
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1.Breaking costs, making pays
Every bond is a spring with a price tag: pulling it apart costs energy, snapping it shut pays energy back. This lesson fixes which half of the reaction spends and which one earns.
Key points
- Bond-breaking is an endothermic process because energy must be taken in to break bonds.
- Bond-making is an exothermic process because energy is released when new bonds are formed.
- Whether a reaction is exothermic or endothermic overall depends on the balance between breaking and making.
- Each chemical bond has a specific bond energy for breaking it or forming it.
- Bond energies are usually quoted in kilojoules per mole of bonds.
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Guided content from the SME authoring corpus — note rn_KTZjJ7sPdDt4tkTH, pinned at 51a6ed34e715 · promoted SyllabAI/syllabai-resources e967e75f1339
