Quiz 2 1-26-07

Quiz 2 1-26-07 - 4. What is the role of a moderator in a...

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1. Combustion of pentane in air at constant temperature and pressure leads to the formation of carbon dioxide and water according to the following equation: 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 kJ H 3523 O H 6 CO 5 O 8 H C ) ( 2 2(g) 2(g) ) 12( 5 = Δ + + l l Δ H = Δ E + Δ (PV)
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2. The enthalpy of formation of Fe 2 O 3 (s) is –826 kJ/mol. What is the value of the heat, q, when 1.00 mol of iron reacts with excess oxygen to form Fe 2 O 3 at 298 K and a constant pressure of 1.00 atm? a) –206 kJ b) –413 kJ c) –826 kJ d) –1652 kJ e) –3304 kJ
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3. Which of the following substances has a Δ H f 0 value equal to zero? b) N ( l ) c) O (g) a) H ( s ) d) C (diamond) e) None of the above
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Unformatted text preview: 4. What is the role of a moderator in a fission reactor? a) It absorbs neutrons and prevents them from causing more fissions b) It absorbs electrons and maintains electrical neutrality in the reactor. c) It emits extra neutrons. d) It slows down neutrons and increases their efficiency to cause fission. e) None of the above. 5.What fuel source is being used to study power generation in a device called a tokamak ? a) gas phase mixture of coal and hydrogen. b) a plasma composed of protons and electrons c) a gas phase mixture of natural gas and ethanol d) a plasma of deuterons and tritons e) a gas phase mixture of protons and positrons...
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Quiz 2 1-26-07 - 4. What is the role of a moderator in a...

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