Free interactive chemistry · SIM-EQ-001

Dynamic equilibrium

Particles react forwards and backwards at random until both rates are equal — dynamic equilibrium.

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How to use this simulation

Choose a system (A ⇌ B or N₂O₄ ⇌ 2NO₂) and what to start with.
Set the forward and reverse rate constants kf and kr.
Press play and watch the counts and the rate graphs.
Compare Q with K in the “Q vs K” panel.

What to notice

At equilibrium reactions still happen — forward and reverse rates are equal.
K = kf / kr, whatever you start with.

Try this

Start with only B. Does the system reach the same mixture as starting with A?

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