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Unformatted text preview: Exam Phase changes, thermodynamic processes. Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) A 1220- kg sample of water at 0° C is cooled to - 29° C, and freezes in the process. How much heat is liberated? (For water L f = 334 kJ/kg and L v = 2257 kJ/kg. The specific heat for ice is 2050 J/kg · K.) A) 138,000 kJ B) 556,000 kJ C) 335,000 kJ D) 480,000 kJ 2) A steel bar is heated from 320.0 K to 466.0 K. If the bar originally was 20.00 m long, what will its final length be? (For steel, α = 12.0 x 10- 6 /K). A) 60.1 m B) 20.1 m C) 6.68 m D) 20.0 m 3) A gas fills a chamber that has a low- friction piston that can move, thereby increasing its volume. The piston is held in place primarily by gravity. The chamber is heated, and the piston moves accordingly. What kind of process is this? A) Isobaric B) None of those C) Adiabatic D) Isothermal 4) A weather balloon is filled with helium and released. What kind of a process is approximated? Assume the4) A weather balloon is filled with helium and released....
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- Spring '11
- Thermodynamics, Exam Phase changes