The first law of thermodynamics is a statement of
Correct answer: A. the conservation of energy
- A. the conservation of energy
- B. the conservation of mass
- C. the increase of entropy
- D. the constancy of temperature
Explanation
Energy can be converted from one form to another but can neither be created nor destroyed, which is expressed as the change in internal energy equalling the heat added to the system plus the work done on it. It follows that a machine producing energy from nothing is impossible. The tendency of entropy to increase is the second law, an entirely separate statement.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? support@testustad.com
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
When 1 mole of methane burns, the energy released is used to heat water. This illustrates that
The mathematical statement of the first law of thermodynamics is
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 fundamental way to transfer energy are:_____________?