Question detail
What is the relationship between enthalpy change and the heat absorbed or released during a reaction at constant pressure?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Energetics
Question
What is the relationship between enthalpy change and the heat absorbed or released during a reaction at constant pressure?
Answer
The enthalpy change (ΔH) of a reaction at constant pressure is equal to the heat absorbed or released by the system. If ΔH is positive, the reaction is endothermic (heat absorbed), and if ΔH is negative, the reaction is exothermic (heat released).
Explanation
This answer effectively explains the direct relationship between enthalpy change and heat transfer in reactions, reinforcing the concept of energy changes in chemistry. The question assesses the student's ability to connect theoretical concepts with practical implications.
Common mistake
Misunderstanding Enthalpy Change Definition
Students often confuse enthalpy change with heat transfer, failing to recognize that enthalpy change is defined under constant pressure and is a measure of the total energy change in a system during a reaction.
To correctly define enthalpy change, remember that it represents the heat content of a system at constant pressure. Use the formula ΔH = q_p, where ΔH is the enthalpy change and q_p is the heat transferred at constant pressure. Ensure to clarify that this definition applies specifically under constant pressure conditions.
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