chm115_lecture12

chm115_lecture12 - Chemistry 115 Lecture 12 Outline Chapter...

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14-1 Chemistry 115 Lecture 12 Outline Chapter 5 Energy Units Energy and Heat Specific Heat Enthalpy HW 6: Due Wed March 3, 11pm Recitation: Chapter 5: Chemistry and Energy Heat, Energy, First Law of Thermodynamics Specific Heat, Calorimetry, Hess’ Law and Enthalpy Calculations
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14-2 Energy and Chemistry Hydrogen Economy?
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Some Types of Energy 14-3
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Fig. 5-2, p. 211 Potential and Kinetic Energy The diver converts potential to kinetic energy In chemistry, we can convert chemical potential energy into kinetic energy (heat or work).
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Positive and negative particles (ions) attract one another. Two atoms can bond As the particles attract they have a lower potential energy NaCl — composed of NaCl — composed of Na Na + and Cl and Cl - ions. ions. Potential Energy on the Atomic Scale
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Positive and negative particles (ions) attract one another. Two atoms can bond As the particles attract they have a lower potential energy Potential Energy on the Atomic Scale PLAY MOVIE
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Thermodynamics Thermodynamics is the science of energy transfer as heat. Heat energy is associated Heat energy is associated with molecular motions. with molecular motions. Energy transfers as heat until thermal equilibrium is established. ∆T measures energy transferred. PLAY MOVIE PLAY MOVIE
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System and Surroundings SYSTEM The object under study SURROUNDINGS Everything outside the system
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14-9 Exothermic processes transfer heat from system to surroundings Endothermic processes transfer heat to system from surroundings Heat Changes Note the sign of heat: q
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Quantitative Aspects: HEAT CAPACITY The heat required to raise an object’s T by 1 ˚C.
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