Question detail
In a reaction profile diagram, what does the peak represent?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Energetics
Question
- A. The energy of the reactants
- B. The energy of the products
- C. The activation energy of the reaction
- D. The enthalpy change of the reaction
Answer
The activation energy of the reaction
Explanation
The peak of a reaction profile diagram represents the activation energy, which is the minimum energy required for the reaction to occur.
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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