Question

Why does the rate of most reactions decrease over time?

Answer 1

hi there

your answer to this is :

When you lower the temperature, the molecules are slower and collide less. That temperature drop lowers the rate of the reaction. that is a greater density of molecules increases the number of collisions. When you decrease the pressure, molecules don't hit each other as often and the rate of reaction decreases.

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Answer 2

As the reactants are consumed, the rate slows down

Step-by-step explanation:

The rate of chemical reaction depends on the availability (concentration) of participating chemical reagents so as the reactants decrease with passage of time, the rate also decreases. The rate of reaction is directly proportional to the reagent concentration. Another reason is that with the passage of time most often the temperature also goes down hence resulting the slowing down of reaction rate.