Disc_Sect_2 - Chemistry 104 B/D Key Ideas from...

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Chemistry 104 B/D Discussion Section Worksheet Discussion Section #2 Key Ideas from Lecture #2: -1 st Law of Thermo: -Systems and surroundings: - Δ E = q + w; or… Δ E = q - P ext Δ V Let’s think about these concepts for a bit... We create a helium balloon in Champaign-Urbana and then “let it go.” We watch as the balloon rises into the air. What will happen to the internal energy of the He atoms as the balloon floats away? Will the balloon keep rising forever? Why/Why not? What would happen to the internal energy of the He atoms as the balloon floats towards the tropics? Problems: Hour Exam I, Fall 2007, #7 As a system increases in volume, it absorbs 48.3 J of energy in the form of heat from the surroundings. The piston is working against a pressure of 0.450 atm. The final volume of the system is 58.0 L. What was the initial volume of the system if the internal energy of the system decreased by 98.5 J? Stuck? List all the information that you know. Start with Sample Exercise 6.1 (pg 233 of Zumdahl) then apply your answer to Sample Exercise 6.2 (pg 234 of Zumdahl).
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