Which of the following is applicable for a thermo chemical reaction?
Correct answer: B. It tells whether a reaction is exothermic or endothermic.
- A. It tells about the physical state of the reactants and products.
- B. It tells whether a reaction is exothermic or endothermic.
- C. It tells about the allotropic forms of the reactant.
- D. It tells whether a particular reaction is possible or not.
Explanation
The correct answer is Option B. A thermochemical reaction involves the study of energy changes, particularly heat, associated with chemical reactions. It specifically indicates whether a reaction is exothermic (releases heat) or endothermic (absorbs heat). Option A is incorrect because while the physical state is important, it is not the main focus of thermochemical reactions. Option C is incorrect as it deals with allotropy, which is not relevant to thermochemistry. Option D is incorrect because the possibility of a reaction occurring is more related to thermodynamics and kinetics rather than the specific heat changes in a reaction.
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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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