Assuming first or second order kinetic behavior, the dissolution rate constant could then be extracted from the data.
2.
Enzyme reactions such as those in photosynthesis don't follow either first or second order kinetics, but Michaelis-Menten kinetics.
3.
Any acid base neutralization reaction ( e . g . vinegar and baking soda ) will most likely follow second order kinetics, and thus an exponential growth in the concentration of the products over time.