1372 Lec 01Nov2011 - 1 2 3 4 5 6 7 8 9 Chapter 6...

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9 Energy is the capacity to do work (to displace or move matter). Unit: joules (J or kg . m 2 /s 2 ) Sometime calorie (cal) is used: 1 cal = 4.184 J. Potential energy is energy of position or composition. Kinetic energy is the energy of motion. E k = ½ mv 2 Chapter 6 Thermodynamics Energy Thermochemistry is the study of energy changes that occur during chemical reactions. System : the part of the universe being studied. Surroundings : the rest of the universe. Thermochemistry
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10 Internal energy ( U ) is the total energy contained within a system Part of U is kinetic energy (from molecular motion) Translational motion, rotational motion, vibrational motion. Collectively, these are sometimes called thermal energy Internal Energy ( U ) Part of U is potential energy Intermolecular and intramolecular forces of attraction, locations of atoms and of bonds. Collectively these are sometimes called chemical energy
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11 Technically speaking, heat is not “energy.” Heat is energy transfer between a system and its surroundings, caused by a temperature difference. Thermal equilibrium occurs when the system and surroundings reach the same temperature and heat transfer stops. Heat (
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1372 Lec 01Nov2011 - 1 2 3 4 5 6 7 8 9 Chapter 6...

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