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Why are combination reactions usually exothermic reactions? Why are decomposition reactions usually endothermic? (though decomposition of orgainic matter is exothermic. why? )

  • Why are combination reactions usually exothermic reactions?
     
  • Why are decomposition reactions usually endothermic?
    (though decomposition of orgainic matter is exothermic. why? )

Grade:10

2 Answers

Arun
25 Points
8 years ago
Let me make one point clear first. There is difference between decomposition of a material( like lead nitrate) and decomposition of organic matter( like faeces).
 Decomposition reactions involve a complex compound breaking up into simpler compounds or elements. This process involves breaking of bonds between the constituent materials of the compounds. This breaking requires energy. As a result, decomposition reactions are endothermic.
        I am just too lazy to type the rest, so vice versa for exothermic reactions.
Arun
25 Points
8 years ago
The decomposition of organic matter (like shit) can actually be told of to be redox reactions. So there.

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