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8 Cards in this Set

  • Front
  • Back
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?
Gas A and B have equal temperatures and enthalpies.
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.
1200 W
Which of the following statements about entropy is false?
The entropy of a system will always increase in a spontaneous reaction.
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?
The activation energy will be greater for the reverse reaction than for the forward reaction.
Which of the following properties of a gaseous system affect its enthalpy?
Pressure, Volume, and Internal energy
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:
10% of the input energy contributes to the work done by the engine.
A box sliding down an incline increases in temperature due to friction. This name for this type of heat is:
the energy transfer here is due to work and not to heat.
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?
It cannot cool the room on a permanent basis.