Chemical Kinetics Notes

To define the change in concentrations over a time interval:

$[R]1$ represents the concentration of reactant R, and $[P]1$ represents the concentration of product P at time $t_1$ .
$[R]2$ represents the concentration of reactant R, and $[P]2$ represents the concentration of product P at a later time $t_2$ .
$\Delta t = t2 - t1$ : This is the change in time, calculated by subtracting the initial time ( $t1$ ) from the final time ( $t2$ ).
$\Delta [R] = [R]2 - [R]1$ : This represents the change in the concentration of reactant R, determined by subtracting the initial concentration ( $[R]1$ ) from the final concentration ( $[R]2$ ).
$\Delta [P] = [P]2 - [P]1$ : This represents the change in the concentration of product P, determined by subtracting the initial concentration ( $[P]1$ ) from the final concentration ( $[P]2$ ).