Heat is the energy that flows across the:
Correct answer: B. Boundaries of the system
- A. Surroundings
- B. Boundaries of the system
- C. Only within the system
- D. All of these
Explanation
Heat is the energy that flows across the boundaries of the system. This means that heat can flow into or out of the system, but it cannot flow within the system.The reason for this is that heat is a form of energy, and energy can only be transferred between systems. In the case of heat, the system and its surroundings are separated by a boundary. This boundary can be real or imaginary, but it must prevent the free flow of energy between the system and its surroundings.If the boundary were not present, then heat would be able to flow freely within the system. This would mean that the temperature of the system would be uniform, which is not possible in reality.Therefore, heat can only flow across the boundaries of the system. This is an important concept in thermodynamics, as it allows us to track the flow of energy into and out of the 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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