chm115_lecture12

chm115_lecture12 - 14-1Chemistry 115Lecture 12...

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Unformatted text preview: 14-1Chemistry 115Lecture 12 OutlineChapter 5Energy UnitsEnergy and HeatSpecific HeatEnthalpyHW 6: Due Wed March 2, 11pmRecitation:Chapter 5: Chemistry and EnergyHeat, Energy, First Law of ThermodynamicsSpecific Heat, Calorimetry, Hess Law and Enthalpy Calculations14-2Energy and ChemistryHydrogen Economy?Some Types of Energy14-3Fig. 5-2, p. 211Potential and Kinetic EnergyThe diver converts potential to kinetic energyIn chemistry, we can convert chemical potential energy into kinetic energy (heat or work).Positive and negative particles (ions) attract one another.Two atoms can bond As the particles attract they have a lower potential energyNaCl composed of NaCl composed of +-Potential Energy on the Atomic ScalePositive and negative particles (ions) attract one another.Two atoms can bond As the particles attract they have a lower potential energyPotential Energyon the Atomic ScalePLAY MOVIEThermodynamicsThermodynamics 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 equilibriumis established.T measures energy transferred.PLAY MOVIEPLAY MOVIESystem and SurroundingsSYSTEMThe object under studySURROUNDINGSEverything outside the system14-9Exothermic processes transfer heat from systemto surroundingsEndothermic processes transfer heat to systemfrom surroundingsHeat ChangesNote the sign of heat: qQuantitative Aspects:HEAT CAPACITYThe heat required to raise an objects T by 1 C. Which has the larger heat capacity?UNITS OF ENERGY1 calorie = heat required to raise 1 calorie = heat required to raise temp. of 1.00 g of Htemp. of 1.00 g of H2O by 1.0 O by 1.0 oC....
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chm115_lecture12 - 14-1Chemistry 115Lecture 12...

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