Enthalpy change of solution of Na2CO3 is a _ reaction?
Correct answer: A. Exothermic reaction
- A. Exothermic reaction
- B. Endothermic reaction
- C. Spontaneous reaction
- D. Nonspontaneous reaction
Explanation
The term exothermic process describes a process or reaction that releases energy from the system to its surroundings, usually in the form of heat, but also in the form of light, electricity, or sound. The sodium carbonate molecules are rearranged in the water, releasing energy as heat. This transfer of heat out of a chemical system is called an exothermic process. The solution gets warmer as heat is released.
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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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