CHM135H1 Final: Thermochemistry Review
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CHM135H1 Full Course Notes
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Thermochemistry: chemical energy: deals with study of energy and its transformations (relative changes between initial and finals) It is the capacity to do work or supply heat. * we define the system as the object of interest. * changes to the system and surroundings are equal and opposite* (if the system loses energy, surroundings must gain that energy) The first law of thermodynamics: law of conservation of energy: energy is conserved (cannot be created or destroyed), the total energy of the system and surroundings are constant, esystem + esurrounding = constant. Thermodynamic changes: change in internal energy, energy is transferred as heat or work, e = q + w, e = efinal - einital. Q = energy heat exchanged (negative if system heats surroundings) W = energy transferred by doing work (negative if work is done by surroundings) H2 is pushing piston, thus doing work on the system.