Thermochemistry background: Definitions from 5.3, 5.4 1. Thermochemistry – The study of the energy changes in chemical reactions. 2. System – That part of the universe we wish to study. 3. Surroundings – That part of the universe other than the system being studied. 4. Boundary – That which divides a system from its surroundings. 5. State of system – The set of specific values of the physical properties of a system (composition, state, concentration, temperature, pressure, volume). Change of state 6. – Transformation of matter from one physical state to another. In thermochemistry, any change in a variable used to define the state of a particular system. 7. Endothermic – A change in which a system’s internal energy increases (thus energy is absorbed) 8. Exothermic – A change in which a system’s internal energy decreases (thus energy is released) 9. Heat of reaction (q) – The heat exchanged between a system and its surroundings when the entire change in energy involves heat. Exothermic is –. Endothermic is +.
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This note was uploaded on 04/12/2011 for the course CHEM 1010 taught by Professor Marshall during the Spring '11 term at North Texas.