Suppose you have a balloon of given volume, V1, containing a gas at Temperature, T1. When you place the balloon in a colder room at temperature, T2, the balloon's temperature starts to drop. What are the signs of the system's q, w,and E for this process?
Correct answer: C. +q, -w, - E
- A. +q, +w, +E
- B. -q, -w, +E
- C. +q, -w, - E
- D. -q, +w, -E
Explanation
In thermodynamics, the standard sign convention is that energy added to a system in the form of heat is treated as positive, and energy added to a system in the form of work is taken as negative - HIP to WIN (heat in positive - work in negative).Since energy is lost is represented as negative therefore option c correctly explains 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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