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.
• Line C: Sloping (concentration changing), not equilibrium.
• Line B: Sloping (concentration changing), not equilibrium.

Answer:

line A