CHEM B1110 Chapter 5: Thermochemistry

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Energy- the capacity to do work or transfer heat. Thermal energy- energy associated with random motion of atoms and molecules. Monitor changes in thermal energy by measuring temperature changes. Law of conservation of energy- energy of one form disappears the same amount of a different energy must appear in a different form or forms. System- specific part of the universe that is of interest to us. Exothermic process- any process that gives off heat. Energy from the system to the surroundings. Si unit of energy is the joule (j) Amount of kinetic energy possessed by a 2-kg mass moving at a speed of 1 m/2. Thermodynamics- scientific study of the interconversion of heat and other kinds of energy. Open system: exchange mass and energy with its surroundings. Closed system: allows the transfer of energy but not mass. Isolated system: does not exchange either mass or energy with its surroundings. Thermodynamics- study the changes in the state of a system.

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