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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? 4. Which of the following nuclei has the smallest bonding energy per nuclear particle? 5. Who is credited with building the first successful nuclear reactor?

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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 8. Which of the following forms of carbon has the smallest heat of formation? 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
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MID TERM EXAM 1 2006 - VERSION A 20 multiple choice...

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