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chem456_ch2lecture - First Law of Thermodynamics Internal...

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2-1 First Law of Thermodynamics Internal Energy Heat and Work Getting work from a heat engine – Thermodynamic cycles Our Strategy about heat and work, they get us started and they are measures of processes or paths. They teach us about state functions of Energy. We discovery entropy from them. Then we can bypass them except for measurement.
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2-1 U ( V,T ) , U ( P,T ) , or U ( P,V ), can take on a number of forms •Kinetic energy of molecules in system. •the potential energy of the constituents of the system relative to the center of mass of the system. For example, a crystal consisting of dipolar molecules will experience a change in its potential energy as an electric field is applied to the system. •the internal energy stored in the form of molecular vibration and rotation. the internal energy stored in the form of chemical bonds that can be released through a chemical reaction. Internal Energy (U)
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