An endothermic reaction is one in which:
Correct answer: B. Heat is absorbed.
- A. Heat is converted into electricity.
- B. Heat is absorbed.
- C. Heat is evolved.
- D. Heat is converted into mechanical work.
Explanation
In an endothermic reaction, the system takes in heat from its surroundings, resulting in a temperature decrease in the surroundings. This absorption of heat is the defining feature of endothermic processes, making Option B the correct answer. Option A is incorrect because it describes a process not related to chemical reactions. Option C describes an exothermic reaction, where heat is released rather than absorbed. Option D is incorrect as it relates to energy conversion not typically associated with chemical reactions.
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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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