Le Chatelier's Principle Visualizer – AP Chemistry

Learning Objectives

Observe stress responses in a dynamic equilibrium

Predict shifts based on Concentration spikes

Connect Volume/Pressure changes to moles of gas

Trace endothermic ($+\Delta H$) thermal stress

System Reaction

$ \text{N}_2\text{O}_4(g) \rightleftharpoons 2\text{NO}_2(g) $

Colorless $\rightleftharpoons$ Brown

$ \Delta H = +57.2 \text{ kJ/mol} $ (Endothermic)

$ K_c = \frac{[\text{NO}_2]^2}{[\text{N}_2\text{O}_4]} $

The Principle

When a dynamic equilibrium is subjected to a stress (concentration, pressure, or temperature), the system shifts to partially counteract the imposed change and re-establish equilibrium.