Bond Energy

[pm1]

Is bond energy always positive??
If so, is it because bond energy is the energy required to break a bond and bond breaking is always endergonic?
Thank you! 🙂

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[hkm]

Yes, breaking bonds is endothermic so bond energies are always positive values. Bond formation is exothermic and releases energy.

 

[Buttafuoco]

Yeah the confusion probably arises from the fact that oftentimes in chemical reactions you will end up with a set of lower energy bonds and thus the net reaction releases energy. But no matter what, you need to put energy in the initial bonds to break them.

 

[MedPR]

Is bond energy always positive??
If so, is it because bond energy is the energy required to break a bond and bond breaking is always endergonic?
Thank you! 🙂

Yes, but endothermic and endergonic are not the same thing. Endergonic refers to a thermodynamically unfavorable reaction. Just because you have to put in energy (which you could define as endothermic or endergonic), doesn't make the reaction endergonic; though it is necessarily endothermic.

 

[pm1]

Yes, but endothermic and endergonic are not the same thing. Endergonic refers to a thermodynamically unfavorable reaction. Just because you have to put in energy (which you could define as endothermic or endergonic), doesn't make the reaction endergonic; though it is necessarily endothermic.

hmm Okay. I thought the definition of endergonic was that requires energy ? Is it not?

Thank you guys!