Full summary notes on the ‘energetics’ topic in A-level Chemistry. Written by an A* student. Simple, short and easy to understand. Very concise and contains everything you need to know for this topic. Suitable for AQA and OCR exam boards.
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• breaking bonds = endothermic = energy is needed = temp of surroundings goes down
• examples of endothermic reactions: thermal decomposition, photosynthesis
• making bonds = exothermic = energy is released = temp of surroundings goes up
• examples of exothermic reactions: combustion, oxidation of carbohydrates
•
EineEnthalpy change = total energy absorbed - total energy released
• the same type of bond may need different amounts of energy to break, depending on its
environment; hence we use the mean bond enthalpy.
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