엥겔의 물리화학 3판 ch2.doc

Chapter 2: Heat, Work, Internal Energy, Enthalpy, and the First Law of Thermodynamics
Problem numbers in italics indicate that the solution is included in the Student’s Solutions Manual.
Questions on Concepts

Q2.1) Electrical current is passed through a resistor immersed in a liquid in an adiabatic container. The temperature of the liquid is varied by 1ºC. The system consists solely of the liquid. Does heat or work flow across the boundary between the system and surroundings Justify your answer.

Although work is done on the resistor, this work is done in the surroundings. Heat flows across the boundary between the surroundings and the system because of the temperature difference between them.

Q2.2) Explain how a mass of water in the surroundings can be used to determine q for a process. Calculate q if the temperature of 1.00-kg water bath in the surroundings increases by 1.25ºC. Assume that the surroundings are at a constant pressure.

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Q2.3) Explain the relationship between the terms exact differential and state function.

Q2.4) Why is it incorrect to speak of the heat or work associated with a system

Q2.5) Two ideal gas systems undergo reversible expansion starting from the same P and V. At the end of the expansion, the two systems have the same volume. The pressure in the system that has undergone adiabatic expansion is lower than in the system that has undergone isothermal expansion. Explain t