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 products
- B. The activation energy
- C. The enthalpy change
- D. The energy of the reactants
Answer
The activation energy
Explanation
The evidence shows that the peak of a reaction profile diagram corresponds to the highest energy point during the reaction, which is the activation energy required for the reaction to proceed. The implication is that this energy barrier must be overcome for the reaction to occur. Thus, the conclusion is that the peak in the diagram represents the activation energy.
Common mistake
Misinterpreting Reaction Profiles
Students often confuse the energy levels of reactants and products in reaction profile diagrams, leading to incorrect identification of exothermic and endothermic reactions.
To fix this, students should carefully analyze the diagram, noting that in exothermic reactions, the products are at a lower energy level than the reactants, while in endothermic reactions, the products are at a higher energy level. This understanding will help them accurately interpret the energy changes.
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