If a physical and chemical change takes place at a constant pressure then the heat change during the process is called__________________?
Correct answer: C. Enthalpy change
- A. Heat of transition
- B. Heat of fusion
- C. Enthalpy change
- D. All of above
Explanation
At constant pressure, the heat absorbed or released by a process is equal to its enthalpy change, q_p = delta H. Heat of fusion and heat of transition are particular types of enthalpy changes, not the general name for every physical or chemical change at constant pressure. Students may choose d by treating the specific examples as alternatives that all apply generally.
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About Enthalpy
Enthalpy is the heat content of a system measured at constant pressure, and its change indicates whether a reaction or physical process is endothermic or exothermic. The topic covers state functions, enthalpy diagrams, standard enthalpy of formation, combustion and neutralisation, and the relationship between ΔH and internal energy change.
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