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Students were decomposing πΆπ‘ŽπΆπ‘‚3 placed in a China dish by heating using burner in the laboratory. The "system" in this experiment is:

Correct answer: D. πΆπ‘ŽπΆπ‘‚3

  • A. China dish
  • B. Burner
  • C. Laboratory
  • D. πΆπ‘ŽπΆπ‘‚3

Explanation

The system is the collective substances in the reaction such as the reactants and products. The surroundings are everything around the reaction such as the reaction flask and the room. During a reaction, energy is transferred between the system and its surroundings. The system and surrounding together make up the universe.

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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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