Chemistry / Unit 10 Chem 1741 short lesson, about 20 seconds
Dynamic Equilibrium: Equal Rates, Not Equal Concentrations
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The idea
Dynamic equilibrium is the state where a reaction's forward and reverse rates are equal, so concentrations stop changing even as both reactions keep occurring.
In practice
In a sealed bottle, liquid bromine evaporates and gas bromine condenses at matched rates once equilibrium is reached.
Where people slip
Assuming equilibrium is reached the instant reactants and products first mix ignores the time needed for rates to converge.
Your place on the trail
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