2007 CHE132 Ex01

2007 CHE132 Ex01 - 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? A) A mysterious thing that no one really understands. B) A fundamental component of the universe. C) A way to keep track of the ability to do work. D) Something we get from the sun in the form of photons. E) All of the above. 3. The Joule (J) is a unit for energy. What is 1 J in the basic SI units? A) 1 kg m s -1 B) 1 kg m s -2 C) 1 kg m 2 s -2 D) 4.184 cal E) 0.239 cal 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? A) - 3,010 kJ B) - 13,135 kJ C) - 3,100 kJ D) + 13,135 kJ E) 0 because energy is conserved 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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6. Which one of the following statements is not correct? A) Bonds store energy, and energy is released when bonds are broken. . B) Bond breaking always is endothemic. C) The formation of a chemical bond between two atoms always is an exothermic process. D) Energy is released when a bond is broken, and a more stable bond is formed. E) The bond enthalpy is the energy required to break a chemical bond between two atoms. 7.
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2007 CHE132 Ex01 - CHE132S07Ex01 Multiple Choice Identify...

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