Why does the rate of most reactions decrease over time?

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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FaithRawlins14

the answer is true. hope it .