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C5 Energy Changes - Coggle Diagram

- - - - These are non-rechargeable
- - - - Example :Ammonium Nitrate (N2 + 3H2 = 2NH3)
      - First work out the first side of the equation
      - N=N bond = 945
      - H-H bond = 436 (x3)
      - Total = 2253
      - Then Work out the other side of the equation
      - H-N bond = 391 (x6)
      - Total = 2346
      - Finally work out the total and figure out whether it is exothermic or endothermic
      - Overall energy change = 2253 - 2346
      - = -93 KJ
      - =Endothermic because the final total is negative (going out to the surroundings
- - - - It cost a million to develop
      - The development took years
      - Some early versions didn't heat up enough
      - This brakes a seal and water and calcium oxide mix
        
        Then its heated up again
    - - An example of this is oxidation of iron
        
        It turns into hydrated Iron(III) Oxide
      - These hand warmers can last for hours
      - Sodium Chloride is used as a catalyst
    - - These last for about 30 minutes
      - The salt is often Sodium Ethanoate