The branch of physical chemistry which deals with the quantities of heat absorbed or evolved during a chemical reaction is called:
Correct answer: B. Thermochemistry
- A. Thermodynamics
- B. Thermochemistry
- C. Calorimetry
- D. None of the above
Explanation
Thermochemistry is the branch of physical chemistry that focuses on the study of heat changes that accompany chemical reactions. It specifically deals with the quantities of heat absorbed or evolved, making it the correct answer. Thermodynamics, while related and broader, encompasses the general study of energy transformations, not limited to chemical reactions. Calorimetry, on the other hand, is a method used to measure heat changes but is not a distinct branch of chemistry. 'None of the above' is incorrect as thermochemistry is the accurate term.
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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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