Which of the Following is True of the Rates of Most

Question

Which of the following is true of the rates of most chemical reactions?
A) The initial rate cannot be measured.
B) The initial rate is faster than the rate later in time.
C) The initial rate is the same as the rate later in time.
D) The initial rate is slower than the rate later in time.

Accepted Answer

The initial rate is usually faster than the rate later in time because at the beginning of the reaction there are more reactant molecules available to react with each other, whereas as the reaction progresses the number of reactant molecules decreases, slowing down the rate of the reaction.