chem notes 5-

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Chapter 5 Thermochemistry Thermodynamics: Study of energy and its transformation Energy: the ability to do work or transfer heat -kinetic energy -potential energy Thermochemistry: describes the energy changes that occur during chemical reactions Definition System: well-defined part of the universe, part of interest Open: matter and energy can be exchanged with the surroundings Closed: can exchange energy but not matter Isolated: neither energy nor matter can be exchanged Surroundings: are everything else Units of energy SI Unit: Joules (J) 1J=1 kg*m 2 /s 2 Older Unit: calorie (cal) Energy required to raise the temperature of 1g of water by 1 O C 1cal=4.184J Kinetic and Potential Energy Kinetic Energy, E k : due to the motion of an object
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