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Homework Help: Energy is neither created nor destroyed in a chemical reactions.

  1. Jul 11, 2006 #1
    Energy is neither created nor destroyed in a chemical reactions. Explain where the energy released by the reactions comes from.
     
  2. jcsd
  3. Jul 11, 2006 #2

    Astronuc

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    Chemical energy exists in the bonds between atoms.

    For example, consider a chemical reaction 2 H2 + O2 -> H2O. The bonds of H and O molecules break and reform to H-O bonds, and energy is released. This is an example of combustion - and this reaction is responsible for propelling the space shuttle into orbit.
     
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