Question

according to the graph, what happens to the concentration of a₂ over time?
reaction: 2a ⇌ a₂
concentration (m)
a₂
a
time (sec)
it decreases and then levels out.
it increases consistently.
it increases and then levels out.
it decreases consistently.

Explanation:

To determine the change in concentration of \( A_2 \) over time, we analyze the graph. The \( A_2 \) curve starts at 0 (since concentration is 0 initially), rises as time increases, and then becomes horizontal (levels out) when the reaction reaches equilibrium. So it increases and then levels out.

Answer:

It increases and then levels out.