Constant P Calorimeter - Bond Formation Q???

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mems1E
Posts: 2
Joined: Tue Nov 17, 2015 3:00 am

Constant P Calorimeter - Bond Formation Q???

Postby mems1E » Sun Jan 24, 2016 12:09 am

Why does the temperature go up/heat is released when a bond is formed? I thought energy was required to form a bond and I cannot figure out why heat is release to form a bond.

More specifically I am referring to Prof L's fourth lecture in the example after he describes/shows a bomb calorimeter.

Kanwaldeep Rai 2H
Posts: 21
Joined: Fri Sep 25, 2015 3:00 am

Re: Constant P Calorimeter - Bond Formation Q???

Postby Kanwaldeep Rai 2H » Sun Jan 24, 2016 11:25 am

When bonds are formed energy is released because the molecules/atoms go from a unstable form to a stable one. They go from high energy to low energy and thus energy in terms of heat is released (exothermic). In order to break bonds, there must be an absorption of energy to overcome electrostatic attraction. This results in an input energy (endothermic).

104422816
Posts: 17
Joined: Fri Sep 25, 2015 3:00 am

Re: Constant P Calorimeter - Bond Formation Q???

Postby 104422816 » Tue Jan 26, 2016 3:07 pm

Generally energy is not required to form a bond but it is definately required to break a bond.


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