Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Exothermic Origin

  1. Nov 13, 2004 #1
    what is the origin of the engery liberated in an exothermic reaction? i've been hitting the books for this but can't find it. Seems simple enough though. I just need to be sure.
     
  2. jcsd
  3. Nov 13, 2004 #2
    Its a form of potential energy that is stored in the bonds of a molecule.. Think of a mouse trap.
     
  4. Nov 14, 2004 #3
    Bond making is an exothermic reaction (opposite of bond breaking in which energy must be applied to break the bonds). If there is a reaction in which more bonds are made than bonds broken than it is an exothermic reaction. The reaction in which weak bonds are broken and strong bonds are formed is also an exothermic reaction.
    Hope this helps.
    Ab S.
     
  5. Nov 14, 2004 #4

    chem_tr

    User Avatar
    Science Advisor
    Gold Member

    I'll give an example, maybe this will clarify something.

    Sulfuric acid dissolves in water with evolution of great amounts of heat. In here, as DeathKnight and so-crates said, some bonds are broken and their energies are evolved as unused energy. This can be explained in another point of view, sulfuric acid dissolved in water has a lower energy, thus more stable than its non-aqueous counterpart. This results with an energy flow outside, what we call as "exothermic" reaction.

    In biological sytems, phosphorus-oxygen bond cleavages, as in ATP and ADP, etc., are used frequently, since it gives great energy gain. Adenosine triphosphate can be regarded as an "energy bank", which releases energy upon "application".
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Exothermic Origin
  1. Exothermic Reactions (Replies: 7)

  2. Exothermic Chemicals (Replies: 0)

  3. Exothermic reaction (Replies: 3)

Loading...