BRAINCAKEEffect of Change in Temperature
The enthalpy change quoted with an equilibrium equation always refers to the forward reaction. The backward reaction has the same ΔH with the opposite sign.
By Le Chatelier's principle:
• Increasing the temperature shifts the equilibrium in the endothermic direction, which absorbs heat energy and opposes the rise.
• Decreasing the temperature shifts the equilibrium in the exothermic direction, which releases heat energy.
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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 Pressure
- 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