How does the rate of reaction change when the reactant is used up over the course of a reaction?

Question

Quizplus · Accepted Answer

As the reactant is used up, the concentration of the reactant decreases, which usually leads to a decrease in the rate of reaction. This is because there are fewer molecules available to collide and react with the other reactants. However, in some cases, the rate of reaction may increase as the reaction progresses, such as in certain enzymatic reactions where the product of the reaction may act as a catalyst for the reaction.

How Does the Rate of Reaction Change When the Reactant