BRAINCAKEEffect of Change in Pressure
A change in pressure only affects the position of an equilibrium that involves gases, and only when there are different numbers of gas molecules on each side of the equation.
By Le Chatelier's principle:
• Increasing the pressure shifts the equilibrium towards the side with fewer gas molecules, which reduces the pressure.
• Decreasing the pressure shifts the equilibrium towards the side with more gas molecules.
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Key terms in this lesson
- le chatelier's principle
- If a system at equilibrium is subjected to a change in conditions, the position of equilibrium shifts to oppose that change.
- equilibrium constant
- A value, Kc, expressing the ratio of product to reactant concentrations at equilibrium for a reaction at a given temperature.
More in Reversible Reactions and Dynamic Equilibrium
- Reversible Reactions
- Dynamic Equilibrium
- Effect of Change in Concentration
- Effect of Change in Temperature
- Effect of Catalysts
- Limitations of Predictions
- Homogeneous and Heterogeneous Equilibria
- The Equilibrium Law
All 18 lessons in Reversible Reactions and Dynamic Equilibrium · All Edexcel AS-level Chemistry topics