Question

reaction: 2j ⇌ j₂
concentration (m)
time (sec)
which line represents
the system at
equilibrium?
line a
line c
line b

Explanation:

Step1: Recall Equilibrium Definition

At chemical equilibrium, the concentrations of reactants and products remain constant (no net change), so the graph lines should be horizontal (constant concentration over time).

Step2: Analyze Each Line

• Line A: Horizontal (constant concentration), matches equilibrium condition.
• Line C: Still changing (sloping), not equilibrium.
• Line B: Intersection, but concentrations still changing (lines not horizontal yet).

Answer:

line A