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A* FULL Summary Notes for A-level Chemistry: Energetics

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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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Institution
AQA
Module
Unit 3.1.4 - Energetics








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A/AS Level
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AQA
Subject
A Level Chemistry
Unit
Unit 3.1.4 - Energetics
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August 31, 2023
Number of pages
4
Written in
2023/2024
Type
Summary

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Energetics
• standard conditions: 100kPa, 298K

"ber"
• 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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