Thermodynamics and Enthalpy Notes

Thermodynamics and Enthalpy Notes - CHEM 103 Chaiken...

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CHEM 103 Chaiken Thermochemistry Notes 5.2 –The First Law of Thermodynamics First Law of Thermodynamics– Energy is conserved and energy is neither created nor destroyed but may be converted from one form to another (Discovered by Joule and Clausius) Internal Energy (E)– Sum of all kinetic and potential energies of the components of the system For q: Positive (+) means system gains heat and negative (-) means system loses heat For w: Positive (+) means work is done on the system and negative (-) means work is done by the system Endothermic– Systems absorbs heat Exothermic– System loses heat State Function– A property of a system that is determined only by the current
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Unformatted text preview: state of the system and not the path • The sum of heat and work is a state function • Internal Energy is a state function (E) • Pressure and volume are state functions • Enthalpy (H) is a state function Heat Tax– Potential energy cannot be fully converted into work since some is lost as heat 5.3 –Enthalpy Pressure-Volume Work (P-V work) –Work involved in the expansion or compression of a gas If a piston compresses a system, work is done on (+) the system If a piston decompresses a system, work is done by (-) the system...
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