Which of these statements is not true about the chemical reaction rates

a. the reaction rates can change
b. the reaction rates can increase
c. the reaction rates can decrease
d. the reaction rates are always constant

D is the correct answer. Chemical reaction rates won't always be constant, you can change the rate of a chemical reaction. Factors that affect chemical reaction rates would be temperature, the concentration (pressure) of the reactant, or just the general surface area (crushing a reactant would be an example). Solvent polarity can also decrease the rate of a chemical reaction. Therefore, A, B, and C are true, leaving D as the answer.

Here Is Your Answer

D. the reaction rates are always constant.

REASON: No chemical reaction is a perfect one. Every time slight variation can be seen in the chemical reactions.

So, reaction rates are not always constant.

HOPE IT IS USEFUL

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