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Energy in chemical reactions

Chemical reactions can give out or take in heat and it is interesting for students to begin to understand why this is. As fuels become scarce, it is particularly important to be able to calculate how much energy would be expected from different reactions.

Energy level diagrams are a clear, visual way of presenting this information and the use of bond energies is one way of calculating the energy change in a reaction. Using a calorimeter is a practical way of finding out how much energy is produced when different substances are burnt and this can be related to energy values of foods and the need to avoid obesity. A solution calorimeter can find the energy change of a reaction in solution.

Specification links: AQA C13.4, OCR Gateway C6, OCR 21st Century Science C7.2.

If you cannot find what you want in the listed resources, enter keywords from your specification in the Search box on the right. Reduce the number of ‘hits’ by using inverted commas to search for phrases.

Useful links/resources

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AQA (5) | OCR 21st Century Science (5) | OCR Gateway (3) | Activity Resources (1) | Instructional (1) | Learning Resource (5) |

AQA (Showing 5 of 5 available)

• Doc Brown: Energy transfers in chemical reactions
    Web link 
  AQA 13.4, OCR Gateway C6a, OCR 21st Century C7.2 Website from Doc Brown about energy transfers in reactions. Includes diagrams, explanations and worked examples, plus extension work for the more able....
  
  
• Exothermic Reaction
    Web link 
  AQA 13.3, OCR Gateway C6a, OCR Twenty First Century Science C7.2 A webpage explaining a simple exothermic reaction. Suitable for a practical or a demonstration. From Chemistry.about.com
  
  
• Food, fuels and energy changes in reactions
    Web page 
  AQA 13.4, OCR Twenty First Century Science C7.2 An outline of the key ideas needed to explain energy changes in chemical reactions. Endothermic and exothermic changes are described using energy level ...
  
  
• Energy and Bonds
    Web link 
  AQA 13.4, OCR Gateway C6a, OCR 21st Century C7.2 Information on energy and bonds, including calculations, diagrams and examples of reactions. Provides links to futher related pages and topics. Ideal f...
  
  
• Endothermic and exothermic reactions
    Web link 
  AQA 13.4, OCR Twenty First Century Science C7.2 Descriptions, examples and links to demonstrations of endothermic and exothermic reactions from About.com chemistry
  
  

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OCR 21st Century Science (Showing 4 of 5 available)

• Doc Brown: Energy transfers in chemical reactions
    Web link 
  AQA 13.4, OCR Gateway C6a, OCR 21st Century C7.2 Website from Doc Brown about energy transfers in reactions. Includes diagrams, explanations and worked examples, plus extension work for the more able....
  
  
• Exothermic Reaction
    Web link 
  AQA 13.3, OCR Gateway C6a, OCR Twenty First Century Science C7.2 A webpage explaining a simple exothermic reaction. Suitable for a practical or a demonstration. From Chemistry.about.com
  
  
• Energy and Bonds
    Web link 
  AQA 13.4, OCR Gateway C6a, OCR 21st Century C7.2 Information on energy and bonds, including calculations, diagrams and examples of reactions. Provides links to futher related pages and topics. Ideal f...
  
  
• Food, fuels and energy changes in reactions
    Web page 
  AQA 13.4, OCR Twenty First Century Science C7.2 An outline of the key ideas needed to explain energy changes in chemical reactions. Endothermic and exothermic changes are described using energy level ...
  
  

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OCR Gateway (Showing 3 of 3 available)

• Doc Brown: Energy transfers in chemical reactions
    Web link 
  AQA 13.4, OCR Gateway C6a, OCR 21st Century C7.2 Website from Doc Brown about energy transfers in reactions. Includes diagrams, explanations and worked examples, plus extension work for the more able....
  
  
• Exothermic Reaction
    Web link 
  AQA 13.3, OCR Gateway C6a, OCR Twenty First Century Science C7.2 A webpage explaining a simple exothermic reaction. Suitable for a practical or a demonstration. From Chemistry.about.com
  
  
• Energy and Bonds
    Web link 
  AQA 13.4, OCR Gateway C6a, OCR 21st Century C7.2 Information on energy and bonds, including calculations, diagrams and examples of reactions. Provides links to futher related pages and topics. Ideal f...
  
  

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Activity Resources (Showing 1 of 1 available)

• Endothermic and exothermic reactions
    Web link 
  AQA 13.4, OCR Twenty First Century Science C7.2 Descriptions, examples and links to demonstrations of endothermic and exothermic reactions from About.com chemistry
  
  

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Instructional (Showing 1 of 1 available)

• Food, fuels and energy changes in reactions
    Web page 
  AQA 13.4, OCR Twenty First Century Science C7.2 An outline of the key ideas needed to explain energy changes in chemical reactions. Endothermic and exothermic changes are described using energy level ...
  
  

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Learning Resource (Showing 5 of 5 available)

• Doc Brown: Energy transfers in chemical reactions
    Web link 
  AQA 13.4, OCR Gateway C6a, OCR 21st Century C7.2 Website from Doc Brown about energy transfers in reactions. Includes diagrams, explanations and worked examples, plus extension work for the more able....
  
  
• Exothermic Reaction
    Web link 
  AQA 13.3, OCR Gateway C6a, OCR Twenty First Century Science C7.2 A webpage explaining a simple exothermic reaction. Suitable for a practical or a demonstration. From Chemistry.about.com
  
  
• Food, fuels and energy changes in reactions
    Web page 
  AQA 13.4, OCR Twenty First Century Science C7.2 An outline of the key ideas needed to explain energy changes in chemical reactions. Endothermic and exothermic changes are described using energy level ...
  
  
• Energy and Bonds
    Web link 
  AQA 13.4, OCR Gateway C6a, OCR 21st Century C7.2 Information on energy and bonds, including calculations, diagrams and examples of reactions. Provides links to futher related pages and topics. Ideal f...
  
  
• Endothermic and exothermic reactions
    Web link 
  AQA 13.4, OCR Twenty First Century Science C7.2 Descriptions, examples and links to demonstrations of endothermic and exothermic reactions from About.com chemistry
  
  

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