MID TERM EXAM 1 2006

MID TERM EXAM 1 2006 - VERSION A. 20 multiple choice...

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VERSION A . 20 multiple choice questions, 2.5 points each 1. In a thermodynamic process a system does 20 J of work and absorbs 40 J of heat. What are the values of the internal energy change ( E), heat (q) and work (w) for this process? a) E = + 60 J, q = + 40 J, w = + 20 J b) E = - 20 J, q = - 40 J, w = +20 J c) E = - 60 J, q = - 40 J, w = -20 J d) E = + 20 J, q = +40 J, w = -20 J e) A process with these values of q and w cannot occur because energy is not conserved. 2. Along pathway A between an initial state and a final state, the system absorbs 300 J of heat and its internal energy decreases by 200 J. Along a pathway B between the same initial and final states, the system absorbs 250 J of heat and does 450 J of work. What is the value of the work along pathway A? a) + 200 J b) - 200 J c) +500 J d) - 700 J e) none of the above 3. When a gas is cooled at constant volume from an initial temperature of 50 o C to 25 o C it loses 60.0 J of heat. When the same gas is cooled from 50 o C to 25 o C at constant pressure, it loses 100 J of heat. What is the value of the enthalpy change, H, when the gas is heated from 25 o to 50 o at constant volume? a) +60.0 J b) - 60.0 J c) + 100 J d) - 100 J e) - 40 J 4. Which of the following nuclei has the smallest bonding energy per nuclear particle? a) lead, 207 Pb b) deuterium, 2 H c) iron, 56 Fe d) uranium, 235 U f) gold, 197 Au 5. Who is credited with building the first successful nuclear reactor? a) Erwin Oppenheimer b) Edward Teller c) Enrico Fermi d) Albert Einstein e) Julius Mayer
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6. What method is used to confine matter when lasers are used to heat the matter to ignition temperatures for fusion? a) magnetic confinement b) inertial confinement c) gravitational confinement d) thermal confinement e) strong force confinement 7. The source of the heat released in the fission of 235 U is a) conversion of electrons into heat b) conversion of protons into heat c) conversion of neutrons into heat d) conversion of internal energy into heat e) all of the above 8. Which of the following forms of carbon has the smallest heat of formation? a) graphite b) diamond c) buckminsterfullerene d) amorphous carbon e) they all have the same heat of formation of zero. 9. Combustion of pentane in air at constant temperature and pressure leads to the formation of carbon dioxide and water according to the following equation: H = -3523 kJ The value of E for this reaction is a) not related to H b) less negative than H c) more negative than H d) equal to H e) 0 10. Suppose you add 45 J of heat to a system, let it do 10. J of expansion work, then return the system to its initial state by cooling and compression. Which statement is true for this process? a)
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This note was uploaded on 08/06/2008 for the course CHEM 1B taught by Professor Watts during the Winter '08 term at UCSB.

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MID TERM EXAM 1 2006 - VERSION A. 20 multiple choice...

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