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(c) doc bDoc 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

1. Heat changes in chemical/physical changes - exothermic and endothermic

2. Reversible reactions and energy changes

3. Activation energy and reaction profiles

4. Catalysts and activation energy

5. Introduction to bond energy/enthalpy calculations

6. Calorimeter methods of determining energy changes

7. Energy transfer calculations from calorimeter results

Advanced Level Energetics-Thermochemistry - Enthalpies of Reaction, Formation & Combustion

Foundation tier-easier GCSE multiple choice QUIZ on exothermic/endothermic reactions etc.

Higher tier-harder multiple choice GCSE QUIZ on exothermic/endothermic reactions etc.


The original page has now been split into 4 sections for GCSE/IGCSE/O Level science-chemistry students


PART A

1. Heat changes

1a. Heat Changes in Chemical Reactions

2. Reversible Reactions and energy changes

Now on separate page PART A


PART B

3. Activation Energy and Reaction Profiles

3a. The significance of activation energy

3b. Further examples of reaction progress profiles

4. Catalysts and Activation Energy

Now on separate page PART B


PART C

5. Calculation of heat transfer using bond energies (bond enthalpies)

Now on separate page PART C


PART D

6. The experimental determination of energy changes using simple calorimeters

The basic principles of calorimetry

7. Calculations from the experimental calorimeter results

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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