At constant volume, the heat supplied to a system is always equal to its
Correct answer: D. internal energy change
- A. bond energy
- B. enthalpy change
- C. heat of sublimation
- D. internal energy change
Explanation
At constant volume, the change in internal energy (ΔU) of a system can be expressed using the heat added to the system and the work done. Since the volume is constant, no work is done by expansion (W=0). Thus, the first law of thermodynamics simplifies to:ΔU=Q−WIn this case, since W=0ΔU=Q
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About Thermochemistry and Energetics of Chemical Reactions
Thermochemistry measures energy changes in chemical reactions and distinguishes exothermic from endothermic processes. Work covers systems, surroundings and state functions, internal energy, the first law of thermodynamics, enthalpy and Hess's law, including the sign conventions used when heat enters or leaves a system.
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