The mechanism for formation of the product X is: A + B rightarrow C + D (slow) B

Question

The mechanism for formation of the product X is: A + B rightarrow C + D (slow) B+ D rightarrow X (fast) The intermediate reactant in the reaction is _____ A) A B) B C) C D) D E) X Which of the following is true? A) If we know that a reaction is an elementary reaction, then we know its rate law. B) The rate-determining step of a reaction is the rate of the fastest elementary step of its mechanism. C) Since intermediate compounds can be formed, the chemical equations for the elementary reactions in a multistep mechanism do not always have to add to give the chemical equation of the overall process. D) In a reaction mechanism, an intermediate is to an activated complex. E) All of the above statements are true. The rate law of the overall reaction A + B rightarrow C is rate = k [A]^2. Which of the following will not increase the rate not reaction? A) increasing the concentration of reactant A B) increasing the concentration of reactant B C) increasing the temperature of the reaction D) adding a catalyst for the reaction E) All of these will increase the rate.

Explanation / Answer

(6) Since D is formed in the first step and consumed in the second step, it is intermediate

(D)

(7) (C)

(8) Since in the overall rate law expression, there is no concentration term of B. So, rate of reaction does not depend on the concentration of B.

(B) Increase in concentration of B

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