Le Chatelier's principle states that when a stress is applied to a system at equilibrium, the system
Correct answer: A. shifts in the direction that relieves the stress
- A. shifts in the direction that relieves the stress
- B. shifts in the direction that increases the stress
- C. stops reacting altogether
- D. always shifts towards the products
Explanation
The position of equilibrium moves so as to partly oppose the change imposed, whether that change is in concentration, pressure or temperature. Adding a reactant therefore drives the reaction forward, and removing a product does the same. The principle predicts direction only; it says nothing about how far or how fast the shift occurs.
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About Le Chatelier's Principle
Le Chatelier's principle predicts how an equilibrium responds when concentration, pressure or temperature changes. Questions apply it to reversible reactions, identify the direction of shift and distinguish genuine equilibrium changes from the effect of a catalyst, which changes the rate of reaching equilibrium but not its position.
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