Reaction of water with quicklime results in the rise in the temperature of the system. Using the concept of an energy change, indicates the nature of the reaction?
Correct answer: D. Exothermic Reaction
- A. Endothermic Reaction
- B. Non spontaneous Reaction
- C. Third Order Reaction
- D. Exothermic Reaction
Explanation
Calcium oxide reacts with water to form calcium hydroxide, also called slaked lime. Here are the equations for this reaction:Calcium oxide + water → calcium hydroxideCaO+H2O → Ca(OH)2A lot of heat is produced in the reaction, which may even cause the water to boil.Hence it is a combination reaction as well as exothermic 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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