If energy of reactants is less than that of products then during the reaction _.
Correct answer: C. Heat is absorbed
- A. Heat remains constant
- B. Heat is lost
- C. Heat is absorbed
- D. No heat gain or lose takes place
Explanation
Option C is correct since, in an endothermic reaction, the products are higher in energy than the reactants. Therefore, the change in enthalpy is positive, and heat is absorbed from the surroundings by the 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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