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8 Cards in this Set
- Front
- Back
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Two ideal gases, A and B, are at the same temp, Vol, and Pressure. Gas A is reversibly expanded at constant T to a vol V. Gas B is allowed to expand into an evacuated chamber until it also has a total vol V, but without exchanging heat with its surroundings. Which of the following most accurately describes the two gases?
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Gas A and B have equal temperatures and enthalpies.
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What is the minimum power required for a heat engine to lift a 80kg mass 5m in 20s if it releases 1000J of heat energy from its exhaust each second.
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1200 W
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Which of the following statements about entropy is false?
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The entropy of a system will always increase in a spontaneous reaction.
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For a particular reversible reaction, the forward process is exothermic and the reverse process is endothermic. Which of the following statements must be true about this reaction?
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The activation energy will be greater for the reverse reaction than for the forward reaction.
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Which of the following properties of a gaseous system affect its enthalpy?
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Pressure, Volume, and Internal energy
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Under the best possible conditions, a steam engine will have an efficiency of slightly more than 20%. A normal steam engine has an efficiency of about 10%. This means that for a normal steam engine:
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10% of the input energy contributes to the work done by the engine.
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A box sliding down an incline increases in temperature due to friction. This name for this type of heat is:
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the energy transfer here is due to work and not to heat.
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Which of the following is true concerning an air conditioner that sits inside a thermally sealed room and draws energy from an outside power source?
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It cannot cool the room on a permanent basis.
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