When does the middle product peak?
Reactions with rate constants nobody has measured yet. Shake them, see the timing.
The question
A turns into B, and B turns into C. With both rates uncertain, the moment of most B moves around. The fan shows how far.
What the model assumes
Two first-order steps, example rates, no side reactions.
Results are hypotheses, not facts. Example models use round example numbers, not measured data. See honesty rules.