Which of the following is not correct?
Correct answer: B. Neutralization is always exothermic
- A. Dissolution of NH4Cl in excess of water is an endothermic process
- B. Neutralization is always exothermic
- C. The absolute value of enthalpy (H) can be determined experimentally
- D. The heat of reaction at constant volume is denoted by ΔE
Explanation
Neutralization reactions involve the combination of an acid and a base to form water and a salt. While many neutralization reactions are indeed exothermic, it is not accurate to say that neutralization is always exothermic. The heat change in a neutralization reaction depends on the specific acid and base involved. In some cases, neutralization reactions can be endothermic, resulting in an absorption of heat.
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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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