Two fundamental ways to transfer energy are________________?
Correct answer: C. heat and work
- A. pressure and temperature
- B. pressure and volume
- C. heat and work
- D. heat and volume
Explanation
Energy crosses the boundary of a thermodynamic system mainly as heat or work, expressed in the first law as ΔU = q + w. Pressure and volume are state variables, not independent modes of energy transfer, so students may incorrectly select b because pressure-volume work involves both quantities.
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About First Law of Thermodynamics
The first law states that energy is conserved, so the change in a system's internal energy equals heat supplied plus work done on the system, ΔU = q + w. Questions use sign conventions, expansion and compression work, state functions versus path functions, and the relation between internal energy and enthalpy.
Practise Thermochemistry and Energetics of Chemical Reactions
728 free Thermochemistry and Energetics of Chemical Reactions MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
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According to the first law of thermodynamics, ΔU = Q + W, where ΔU Is the increase in internal energy of the system, Q is the heat transferred to the system and W is the external work done on the system.Which of the following is NOT a correct expression?
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