Chemical energetics written questions
Answer G3 Pure / O-Level questions on exothermic and endothermic reactions, energy profiles and fuels, with marking guidance for written work.
Learning goals
- Describe enthalpy change, with ∆H negative for exothermic and positive for endothermic reactions
- Draw energy profile diagrams showing the enthalpy change and activation energy of a reaction
- Describe bond breaking as endothermic and bond making as exothermic
- Explain the overall enthalpy change of a reaction from the energy needed to break bonds and released when bonds form
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Paper instructions
Practise
Practise questions on the skills you are learning. This is for practice only and doesn’t count towards your course progress.
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- About 10 minutes.
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Beyond the syllabus: optional enrichment that does not count towards your progress.