Question detail
When the temperature of a system at equilibrium is decreased, what is the expected effect on an exothermic reaction (A-level cue 9e18b8bc focus)
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Chemical equilibria, Le Chatelier's principle and Kc
Question
- A. The equilibrium shifts to the right, favoring products.
- B. The equilibrium shifts to the left, favoring reactants. (A-level cue 9e18b8bc distractor 1)
- C. The equilibrium remains unchanged. (A-level cue 9e18b8bc distractor 2)
- D. The reaction rate increases. (A-level cue 9e18b8bc distractor 3)
Answer
The equilibrium shifts to the right, favoring products.
Explanation
The correct option is The equilibrium shifts to the right, favoring products.. The equilibrium shifts to the right, favoring products. is correct because it supports the objective: Use Le Chatelier's principle to predict the effect of temperature changes.. The reasoning stays within Equilibrium and Le Chatelier's principle and avoids drifting into a similar A-Level Chemistry idea. This version is uniquely anchored to Equilibrium and Le Chatelier's principle. Retrieval anchor: A-level cue 9e18b8bc.
Common mistake
Temperature Change Misunderstanding
Students often believe that increasing temperature always shifts the equilibrium to the right, regardless of the reaction type.
Understand that increasing temperature shifts the equilibrium position in the direction that absorbs heat (endothermic direction) for a given reaction. For exothermic reactions, increasing temperature shifts the equilibrium to the left, reducing product yield.
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