Thermochemistry.ppt1

Thermochemistry.ppt1 - He ss' Law Ent hal py of For ma tion...

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Unformatted text preview: He ss' Law Ent hal py of For ma tion Ent hal py / Ca lorime try 1st Law of The rmo dyn ami cs Ene rgy Thermochemistry Kinetic Energy and Potential Energy Kinetic energy is the energy of motion: Potential energy is the energy an object possesses by virtue of its position. Potential energy can be converted into kinetic energy. Example: a bicyclist at the top of a hill. The Nature of Energy The Nature of Energy 2 2 1 v m E k = Units of Energy SI Unit for energy is the joule, J: sometimes the calorie is used instead of the joule: 1 cal = 4.184 J (exactly) A nutritional Calorie: 1 Cal = 1000 cal = 1 kcal The Nature of Energy The Nature of Energy ( 29 ( 29 J 1 s m kg 1 m/s 1 kg 2 2 1 2 1 2- 2 2 2 = = = = v m E k System: part of the universe we are interested in. Surrounding: the rest of the universe. Boundary: between system & surrounding. Exothermic: energy released by system to surrounding. Endothermic: energy absorbed by system from surr. Thermochemistry Terminology Thermochemistry Terminology Work ( w ): product of force applied to an object over a distance. Heat ( q ): transfer of energy between two objects Internal Energy Internal Energy: total energy of a system. Involves translational, rotational, vibrational motions. Cannot measure absolute internal energy. Change in internal energy, The First Law of Thermodynamics The First Law of Thermodynamics initial final E E E- = HyperChem Relating E to Heat(q) and Work(w) Energy cannot be created or destroyed. Energy of (system + surroundings) is constant. Any energy transferred from a system must be transferred to the surroundings (and vice versa ). From the first law of thermodynamics: The First Law of Thermodynamics The First Law of Thermodynamics w q E + = The First Law of The First Law of Thermodynamics Thermodynamics First Law of Thermodynamics Calculate the energy change for a system...
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This note was uploaded on 04/26/2008 for the course CHEM 212 taught by Professor Ng during the Fall '07 term at Winona.

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Thermochemistry.ppt1 - He ss' Law Ent hal py of For ma tion...

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