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Lesson: The First Law of Thermodynamics

Worksheet • 5 Questions

Q1:

Which of the following statements is correct?

  • AFor an adiabatic process in a closed system, Ξ” 𝑆 cannot have a negative value.
  • BFor a closed system, Ξ” 𝑆 can never have a negative value.
  • CFor an adiabatic process in a closed system, Ξ” 𝑆 must be zero.
  • DFor a reversible process in a closed system, Ξ” 𝑆 must be zero.

Q2:

What is the first law of thermodynamics?

  • AThe change in internal energy of a system is equal to the heat energy supplied to the system minus the work done by the system.
  • BThe force necessary to move an object is equal to its mass multiplied by its acceleration.
  • CThe partial pressure of each component of a mixture of ideal gases is equal to its vapor pressure multiplied by its mole fraction.
  • DAn object will remain static or in motion unless acted on by an external force.

Q3:

Consider a cyclic process in which a system performs a net amount of work on its surroundings (i.e., 𝑀 < 0 n e t corresponding to the net work done by the system). Would this process be endothermic ( π‘ž > 0 ) n e t , exothermic ( π‘ž < 0 ) n e t , or adiabatic ( π‘ž = 0 ) n e t with respect to the net heat ( π‘ž ) n e t exchange between system and surroundings? And what would be the relationship between π‘ž n e t and 𝑀 n e t ?

  • AEndothermic, with π‘ž = βˆ’ 𝑀 n e t n e t
  • BEndothermic, with | π‘ž | > | 𝑀 | n e t n e t
  • CAdiabatic, with π‘ž = 0 n e t and 𝑀 < 0 n e t
  • DExothermic, with π‘ž = 𝑀 < 0 n e t n e t

Q4:

The density of ice, H O ( ) 2 s , at 273 K, is 0.915 kg/dm3, and that of liquid water is 0.99987 kg/dm3. How much thermodynamic work must be done to melt 1.00 mol of ice at 1.00 bar pressure?

Q5:

What is the first law of thermodynamics?

  • AThe energy of the universe (encompassing the system and the surroundings) is always conserved in any physical or chemical process.
  • BThe energy of a system always increases in any physical or chemical process.
  • CThe entropy of a system always increases in any spontaneous process.
  • DThe energy of a system always decreases in any physical or chemical process.
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