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CHE132S2007Ex01

# CHE132S2007Ex01 - CHE132S07Ex01 Multiple Choice Identify...

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CHE132S07Ex01 Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. 1. Which one of the following statements is not correct? A) The energy change of any system is equal to the energy gained by the system minus the work done by the system. B) Energy is a state function, but the energy flow and work are path functions. C) Enthalpy is a thermodynamic quantity, and the change in enthalpy equals the energy flow at constant volume. D) For solids and liquids, volume changes during chemical reactions generally are very small. E) The enthalpy change for any overall process is equal to the sum of the enthalpy changes for any set of steps that leads from reactants to products. 2. What is energy? 3. The Joule (J) is a unit for energy. What is 1 J in the basic SI units? 4. In a steam engine, steam in a cylinder expands against a piston exerting 10 atm of external pressure. The volume of the cylinder increases by 10 L and simultaneously the steam cools, losing 3000 kJ of energy to the surroundings. What is the change in energy of the steam? 5. The cooling system in an automobile holds 10.0 L of ethylene glycol antifreeze. How much energy is absorbed when the temperature of the ethylene glycol goes from 20 o C to 100 o C. The density and specific heat capacity of ethylene glycol are 1.11 g/mL and 2.42 J g -1 o C -1 , respectively. A) 2150 J B) 2150 kJ C) 1940 kJ D) 1940 J E) 215 J

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