CHAPTER+6_Drill

CHAPTER+6_Drill - CHAPTER 6 Drills Thermochemistry 1 The...

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CHAPTER 6 Drills/ Thermochemistry 1. The following terms are used extensively in thermodynamics. Define each and give an example a) Exothermic and endothermic b) System and surroundings c) Open, close, and isolated system d) State function e) Heat f) Work g) Enthalpy change h) Standard enthalpy of formation. 2. Identify the following systems as an open (O), close (C), or isolated (I): (a) a coffee in a very high quality thermos bottle ____; (b) coolant in a refrigerator coil____; (c) a bomb calorimeter in which methane burns____; (d) a non – operating light bulb____; (e) a living plant_____; (f) a hot bowl of soup____. 3. Classify the following as endothermic (EN) or exothermic (EX) : Freezing:____; Condensation______; Melting:______; Boiling:______. 4. The closed box in each of the following illustrations represents a system, and the arrow show the changes to the system in the process. The lengths of the arrows represent the relative magnitude of q and w . q w w ww q q (1) (2) (3) (4) a. Which of these processes is endothermic? b. For which of these processes, if any is Δ E <0? c. For which of these processes, if any is Δ E = 0 d. For which of these processes, if any is there a net gain of internal energy? 5. The internal energy of a system increased by 928 K when it absorbed 492 J of heat. (a) was work done by or on the system? (b) How much work was done? ( Ans. + 436 J ) 6. A gas in a cylinder was placed in a heater and gained 1.100 kJ of heat. During the process, the cylinder increased in volume from 345 mL to 1846 mL against an atmospheric pressure of 750 Torr. (1 L. Atm =101.3 J a) How much work is done in the expansion? ( Ans. -150 J ) b) Calculate the change in internal energy of the gas in the cylinder? ( Ans. 950 J )
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7. What is the change in internal energy of a system if it releases 0.866 kJ of heat contracting from a volume of 5.5 L to 1.5 L against a pressure of 790 Torr? (1 L.Atm = 101.3 J) ( Ans. -444 J ) 8. A balloonist is preparing to make a trip in a helium-filled balloon. The trips begin in early morning at a temperature of 15 o C. By midafternoon, the temperature has increased to 30 o C. Assuming the pressure remains constant at 1.00 atm, for each mole of
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This note was uploaded on 09/30/2011 for the course CHEM 161 taught by Professor Vacillian during the Spring '08 term at Rutgers.

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CHAPTER+6_Drill - CHAPTER 6 Drills Thermochemistry 1 The...

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