Question detail
What does a downward slope in a reaction profile diagram indicate?
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. An endothermic reaction
- B. An exothermic reaction
- C. A reaction at equilibrium
- D. A catalyst is present
Answer
An exothermic reaction
Explanation
The evidence shows that a downward slope in a reaction profile diagram indicates that the energy of the products is lower than that of the reactants, which is characteristic of an exothermic reaction. The implication is that energy is released during the reaction. Therefore, the conclusion is that a downward slope signifies an exothermic reaction.
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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