If only the transfer of energy with the surrounding but not matter is possible, it is known as:
Correct answer: B. Closed system
- A. Open system
- B. Closed system
- C. Isolated system
- D. Heterogeneous system
Explanation
The correct answer is Closed system. In thermochemistry, a closed system is defined as one where energy can be transferred to and from the surroundings, but matter cannot. This distinguishes it from an open system, where both energy and matter can be exchanged, and an isolated system, where neither energy nor matter is exchanged. A heterogeneous system is unrelated to the concept of energy or matter exchange, but instead refers to systems with distinct components or phases.
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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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