20CHAPTER OUTLINE20.1 Heat and Internal Energy20.2Specific Heat andCalorimetry20.3Latent Heat20.4Work and Heat inThermodynamic Processes20.5The First Law ofThermodynamics20.6Some Applications of the First Law of Thermodynamics20.7Energy TransferMechanisms Heat and the First Law ofThermodynamicsANSWERS TO QUESTIONSQ20.1Temperature is a measure of molecular motion. Heat is energyin the process of being transferred between objects by randommolecular collisions. Internal energy is an object’s energy ofrandom molecular motion and molecular interaction.Q20.2The ∆Tis twice as great in the ethyl alcohol.Q20.3The final equilibrium temperature will show no significantincrease over the initial temperature of the water.Q20.4Some water may boil away. You would have to very preciselymeasure how much, and very quickly measure thetemperature of the steam; it is not necessarily 100°C.Q20.5The fingers are wetted to create a layer of steam between the fingers and the molten lead. The steamacts as an insulator and can prevent or delay serious burns. The molten lead demonstration is
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