Examine your graph plots.

Question

Is the rate constant over time or does it vary over time?

Theoretically, yes it is constant, but sometimes it can vary from one isotope to another.
No, it is not constant at all

Answer 1

. The rate constant can vary over time. In some cases, the rate constant may remain constant throughout the reaction, indicating a constant rate of reaction. However, there are instances where the rate constant changes as the reaction progresses, resulting in a varying rate of reaction. Factors such as temperature, concentration, and catalysts can influence the rate constant and cause it to change over time.