Enthalpy Change for Reactions without bonds breaking/forming

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Anna Johnosn 1C
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Joined: Fri Sep 25, 2015 3:00 am

Enthalpy Change for Reactions without bonds breaking/forming

Postby Anna Johnosn 1C » Mon Jan 11, 2016 2:34 pm

If, in a chemical reaction, bonds are neither broken nor formed, can energy still be required or released? Or will the energy not change at all?

Richmund Tan 1L
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Joined: Fri Sep 25, 2015 3:00 am

Re: Enthalpy Change for Reactions without bonds breaking/for

Postby Richmund Tan 1L » Mon Jan 11, 2016 2:43 pm

I would say typically no, energy would not be created nor used if bonds are neither broken nor formed and the energy will not change at all due to the Law of Conservation of Energy. However, knowing that this is chemistry, there might be some exception to the rule out there, so if anyone could enlighten us, that would be very helpful.

Chem_Mod
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Re: Enthalpy Change for Reactions without bonds breaking/for

Postby Chem_Mod » Mon Jan 11, 2016 3:39 pm

Energy is not created nor destroyed, it simply converts from one form to another, for example: from chemical bonds to heat. Your question is actually very broad to fully explain. If there is no chemical bond broken, for instance phase change, then then heat absorbed by the system is used to raise the temperature by increasing the motion or undergoing phase change. But if you mean there is nothing change at all so there should not be any reaction.


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