Doc Brown's Chemistry KS4 science GCSE/IGCSE/GCE-AS Revision Notes
Exothermic and Endothermic Energy Changes
Energetics Introduction - energy transfers in physical state changes and chemical reactions, simple calorimetry, calculations etc.
Why are there energy changes when a chemical reaction takes place? Do physical state changes involve energy changes? Exothermic energy changes and endothermic energy changes in chemical reactions are described, and exothermic reactions and endothermic reactions are discussed in terms of bond energies - including calculations of energy transfers for GCSE/IGCSE/O Level and basic stuff for GCE Advanced Level AS students. Methods of obtained vales for energy changes in chemical reactions are described and how to do the calculations based on calorimeter experiment results. Also discussed are activation energies, reaction profiles, catalysts.
If you are an A Level student, these pages will help as an introduction, but then you should follow the A Level links to the more advanced revision notes and calculation methods.
Sub-index for ENERGY CHANGES
The original page has now been split into 4 sections for GCSE/IGCSE/O Level science-chemistry students
1. Heat changes
2. Reversible Reactions and energy changes
Now on separate page PART A
3a. The significance of activation energy
3b. Further examples of reaction progress profiles
Now on separate page PART B
Now on separate page PART C
The basic principles of calorimetry
Now on separate page PART D
Revision KS4 Science GCSE/IGCSE/O level Chemistry Information Study Notes for revising for AQA GCSE Science, Edexcel Science/IGCSE Chemistry & OCR 21st Century Science, OCR Gateway Science WJEC gcse science chemistry CCEA/CEA gcse science chemistry (revise courses equal to US grade 8, grade 9 grade 10) science chemistry courses revision guides Introduction to chemical energetics for advanced level students
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