Direction of Reversible Reactions

AP Chemistry· difficulty 3/5

Which feature shows the system has reached equilibrium?

A
$Reaction rate becomes 0$
B
$Temperature reaches 25 C$
C
$[A] = [B]$
D
$Concentrations become time-independent$
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Explanation

At equilibrium, no net change in concentration occurs over time, so the curves become flat. Equality of concentrations is not required; rates are equal but nonzero.

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