Learning objective
(HT only) Explain that bond energies can be used to calculate energy needed to break bonds.
Read the explanation, check the common trap, then practise with flashcards and questions.
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Topic
Exothermic and endothermic reactions
Subtopic
The energy change of reactions (HT only)
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Quick explanation
(HT only) Explain that bond energies can be used to calculate energy needed to break bonds
- This point belongs to Exothermic and endothermic reactions, especially The energy change of reactions (HT only).
- You need to be able to (HT only) Explain that bond energies can be used to calculate energy needed to break bonds.
- The key ideas to know are HT only.
- Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.
Key concepts
Why it matters
This objective helps connect The energy change of reactions (HT only) to exam-style questions, flashcards, and revision notes for Exothermic and endothermic reactions.
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What should you know about (HT only) Explain that bond energies can be used to calculate energy needed to break bonds?
Direct answer
In Chemistry, this page helps you answer questions about (HT only) Explain that bond energies can be used to calculate energy needed to break bonds within Exothermic and endothermic reactions. Focus on the key process, correct scientific terms, and how the idea links to exam-style questions. Key terms to check are Bond energy and Exothermic reaction.
Key terms
- Bond energy: The amount of energy required to break one mole of a specific bond in a molecule. In The energy change of reactions (HT only), this term is used specifically to support the learning objective: (HT only) Explain that bond energies can be used to calculate energy needed to break bonds.
- Exothermic reaction: A reaction that transfers energy to the surroundings, resulting in an increase in temperature.
Common trap
Misunderstanding Bond Energies: Clarify that bond energies specifically refer to the energy required to break bonds, while reaction profiles illustrate the overall energy changes during a reaction.
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Revision notestopic notes
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Open revision notesRelated learning objectives
- State that energy is conserved in chemical reactions.
Energy transfer during exothermic and endothermic reactions
- Explain that a reaction transferring energy to the surroundings leaves products with less energy than the reactants by the amount transferred.
Energy transfer during exothermic and endothermic reactions
- Define an exothermic reaction as one that transfers energy to the surroundings.
Energy transfer during exothermic and endothermic reactions
- Explain that the temperature of the surroundings increases during an exothermic reaction.
Energy transfer during exothermic and endothermic reactions
- Identify combustion, many oxidation reactions and neutralisation as examples of exothermic reactions.
Energy transfer during exothermic and endothermic reactions