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Brown Gas Syringe
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Push and pull a syringe of 2NO₂ ⇌ N₂O₄ gas in a glass tank, dip it in ice water or hot water, and add NO₂ or N₂O₄ to watch the brown color change. Count forward and reverse reactions in the particle view to see dynamic equilibrium, find the equilibrium constant from concentration data, and compare the reaction quotient Q with K to predict how the equilibrium shifts.
Key conceptsreversible reaction · chemical equilibrium · dynamic equilibrium · equilibrium constant · reaction quotient · equilibrium shift · Le Chatelier's principle · nitrogen dioxide