Energy changes in cyclic process is always:
Correct answer: B. Zero
- A. Unity
- B. Zero
- C. Positive
- D. Negative
Explanation
In a cyclic process the net change in internal energy is zero because the system returns to its initial state. However, this does not mean that there are no energy changes in the process. In fact, energy is constantly being transferred into and out of the system during the cycle. The first law of thermodynamics states that the change in internal energy of a system is equal to the heat added to the system minus the work done by the system. In a cyclic process, the net work done by the system is equal to the net heat added to the system, so the change in internal energy is zero. However, there are still energy transfers taking place within the system, and the amount of work and heat transferred can vary depending on the specific process.
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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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