CHEM 107 Lecture 5: Chapter 5 - Thermochemistry
25 Jul 2016
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Document Summary
Thermodynamics: study of energy and its transformation. Thermochemistry: study between chemical reactions and changes in energy. Thermochemical equation: a condition which temperature is uniform throughout a material and no energy ows from one point to another. Potential energy: due to position or composition. Kinetic energy: due to motion of object: associates with object by its virtue of motion. Calorie: amount of energy required to raise temp of 1 gram water by 1 degree celsius (1 cal = 4. 184 j) Thermal energy: energy associated with random motion of atoms and molecules. Chemical energy: energy stored within bonds of chemical substance. Nuclear energy: energy stored writhing neutrons and protons. Electrical energy: energy associated with ow of electrons. System: part of the universe that is the focus of a thermochemical study: isolated/open/closed. Surroundings: everything else in the universe that is not part of the system. Exothermic: energy ows out of system to surroundings (q < 0), negative numbers.
