A piston in a cylinder is a part of?
Correct answer: C. Boundary
- A. System
- B. Surroundings
- C. Boundary
- D. None of These
Explanation
The correct answer is Boundary. In thermochemistry, the piston in the cylinder serves as a boundary that separates the system from its surroundings. This boundary allows for changes in volume and work to be performed on or by the system without mixing the substances involved. The other options are incorrect as they misrepresent the role of the piston. The System refers to the actual substances involved in the reaction rather than a physical component like the piston. Surroundings refers to everything external to the system, while None of These is unfounded since the piston clearly has a defined role in thermodynamic terms.
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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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