Anything under examination in the laboratory is called:
Correct answer: A. System
- A. System
- B. Surroundings
- C. State
- D. All the three above
Explanation
In thermochemistry, the term 'system' is used to denote the specific portion of the universe that is being studied. It is the focus of the experiment or observation. The 'surroundings' consist of everything outside this system, and their interaction with the system is of interest. A 'state' refers to the conditions or properties of the system, such as temperature or pressure, but it is not the object under examination. Therefore, the correct answer is 'System'.
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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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