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.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
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.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Chemistry questions like this
Chemistry is on 14 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More First Law of Thermodynamics questions
The fundamental way to transfer energy are:_____________?
If 100 kJ of heat is absorbed by the system and 40 kJ of work is done on the system, what is the change of internal energy?
The mathematical statement of the first law of thermodynamics is
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?
Choose the correct statement.
If 42J heat is transferred to the system during expansion, what is the change in internal energy when work done is 32J?