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22-09-10 - chemical bonds o Thermal = atomic and molecular...

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Wednesday, September-22-10 - Thermochemistry o Energy in chemical reactions o Thermal – understand at molecular and atomic scale o 1 st law of thermodynamics Enthalpy change Hess’s law Standard enthalpy of formation o Calorimetry - Thermal chemistry = study of energy / heat transfer during a chemical reaction - 1 st law of thermodynamics: does a reaction produce or require energy, and how much? - 2 nd law of thermodynamics: under what conditions? - conservation of energy and mass reactants energy release products - Exothermic reaction = energy is released (on page 4 of the slide) - What is chemical energy? o Potential energy + thermal(kinetic) energy o Potential = attractive/repulsive interactions between atoms/ions/molecules includes
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Unformatted text preview: chemical bonds o Thermal = atomic and molecular motion – depends on T(temperature) -Thermal energy o Increases with temperature and amount of substance relates to physical state o Thermal energy from molecular/atomic motion o Atoms can move through translation, rotation, or vibration o In solid there is no translation or rotation. The only force available is vibration o In liquid and gas ever force of moment Is applicable o The way to transfer thermal energy is through collisions(gas. Liquid) and vibrations (solid) o Spontaneous from hot to cold...
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