What happens to the reaction rate as the reactants get used up in a reaction?

O

A. The rate of the reaction is not affected by the concentration of

reactants.

B. The rate of the reaction increases steadily as products are formed.

O

O

O

C. The rate of the reaction begins to decrease as reactants are used

up

O

D. The rate of the reaction stays constant until the reactants are

gone.

The rate of the reaction depicts the speed at which the reaction occurs to produce the products. As the reactants get used up the reaction rate starts decreasing. Thus, option C is correct.

What are the factors affecting reaction rate?

The reaction rate of the chemical reaction gets affected by numerous factors that include temperature, the concentration of the reactants, catalyst, surface area, and physical state of the reactant.

The concentration of the reactant has a direct effect on the reaction rate as they are the deciding factor of the product formation. At the beginning of the reaction, the speed is fast compared to the end.

As the reactants start getting used up the reaction rate slows down as the molecules are not able to collide faster with other molecules to form the product.

Therefore, in option C. the reaction rate decreases with a decrease in concentration.

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