Can someone explain to me the difference between "heat of reaction" and "change in internal energy" in chemical reactions? I think that heat of reaction represents the exchange of heat with the environment. And here, the heat of reaction comes from the reacting system… but with the change in internal energy…?
What is the difference here?
(1 votes)
Loading...I haven't finished high school yet, so our chemistry protocol isn't that detailed yet. We're supposed to write down the problem statement, a sketch of all the materials, our observations, and also the evaluation. So far, in the evaluation, I've only written down that the experiment worked and the reaction equation that I explained. Is…
Can anyone tell me how to proceed with a) and b)? And sorry for the quality of the picture, my camera just takes terrible pictures on principle.
Can someone show/send the answers? I can't find anything relevant. Thanks in advance! 🙂
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The first main sentence says that the change in internal energy is the sum of work and heat that exchanges the system with the environment. The measured heat of reaction is therefore only equal to the change in internal energy if no work is performed.
See Your difference between U and H. When volums work is done, the heat of reaction is equal to the change of internal energy, corrected by volums work, or more simply the change of enthalpy, because the enthalpy is only internal energy corrected by volums work.