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what is internal energy ?   pls explain briefly  giving  examples

Asked by ppratim02 25th January 2016, 6:25 PM
Answered by Expert

Internal energy (E or U) is one of the thermodynamic properties of a system which is the sum of the kinetic and potential energies of the particles that form the system. Unless change takes place, we usually have no way of evaluating it. A change in internal energy (dE) is due to the transfer of energy into or out of a system, but the volume stays constant. For example, energy transferred into the system, usually heat (q) and work (w), represents an increase of internal energy (dE) of the system. Thus,

dE = q + w

Alcohols and phenols are soluble in water due to their ability to form hydrogen bonds with water molecules.


The solubility of alcohols decreases with increase in the size of alkyl/aryl (hydrophobic) groups.

Answered by Expert 25th January 2016, 6:47 PM
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