CHEM 211 Chapter 5: Chemch5textbook
22 Nov 2016
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Thermochemistry: study of energy, heat during chemical transformations. Internal energy: molecular composition, no kinetic energy because velocity is zero. Water in beaker sitting motionless on the floor. Energy of chemical is lower than energy of the reactant. Energy of chemical is higher than energy of the reactant. State functions = path- independent functions, depend only upon the final and initial states of the system. Kilowatt -- hour (kwh) = energy report for electricity bill. 1 cal = 1,000 calories (small c is smaller) 1 kwh = 3. 6 x 106 joules (j) Joules = establish the exact relationship between the heat entering water and mechanical work done by the mass. Calories = measure the energy you cannot see. Heat and work: energy transfer between a system and its surrounding. Surrounding- everything that is not part of the system. Isolated system- neither energy nor matter is exchanged between system and its surrounding.
