Question

Why does the reaction rate decrease as the reaction progresses?
O A. The temperature begins to go down.
B. The activation energy goes up.
O C. The rate constant changes over time.
O D. There are fewer reactants left to collide.

Answer 1

The reaction rate decreases as the reaction progresses, because there are fewer reactants left to collide.

Answer 2

The reaction rate is the speed of the reactant undergoing changes to yield products. With the progression in the reaction, the rate decreases as the number of reactants decreases. Thus, option D is correct.

What are the factors affecting the reaction rate?

Reaction rate defines the speed of the chemical change that results in product formation from the reactants in a time period. It depends on various factors like temperature, concentration, catalysts, and surface area.

The concentration of the reactants affects the reaction rate majorly as it is the factor that directly affects the rate of the reaction. The reaction rate is fast at the beginning of the reaction but later decreases as the number of the reactant molecules for the reaction gets consumed and hence affects the reaction rate.

Therefore, the concentration directly affects the reaction rate.

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