If a system in equilibrium is subjected to a stress (change in temperature/pressure/concentration), then the system will alter to oppose the effect of the stress

This is what happens when a reaction, at equilibrium is disturbed.

Le Chatelier's Principle allows us to predict, realistically, the effect of temperature, pressure, concentration, catalyst, etc. on the system.

To demonstrate all the following we are going to use the reaction:

N₂ + 3H₂ 2NH₃

When nitrogen (N₂) reacts with hydrogen (H₂) to form ammonia (NH₃)

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