Recall that a reaction reaches equilibrium when:
• once the rate of the forward reaction equals the rate of the reverse reaction
• once at equilibrium there is no net change in the concentration of reactants or products
Which situation is an example of equilibrium?
A. a blade of grass slowly grows taller.
B. the percentage of nitrogen gas in a room decreases steadily.
C. the amount of water in a cup doesn't change.
D. the amount of air in a room slowly increases.
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