REGULAR QUIZZES - REGULAR TOPIC 13 Kinetics SET B
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QUESTION 1. Consider the following proposed mechanism for a reaction.

STEP I: X + Y ==> A + Z
STEP II: Z + X ==> D

Which of the following shows the overall reaction?

(A) X + Y ==> A + D
(B) 2X + Y ==> A + D
(C) 2X + Y + Z ==> A + D
(D) 2X + Y + Z ==> Z + A
(E) None of the above

QUESTION 2. Consider the following proposed mechanism for a reaction.

STEP I: X + Y ==> A + Z
STEP II: Z + X ==> D

Which species is an intermediate?

(A) X
(B) Y
(C) Z
(D) A
(E) D

QUESTION 3. Consider the following proposed mechanism for a reaction.

STEP I: X + Y ==> A + Z
STEP II: Z + X ==> D

Given that the rate law for the reaction is found to be Rate = k [X][Y], which step in the mechanism is the slowest?

(A) Step I
(B) Step II
(C) Not enough data to tell
(D) A combination of Step I and Step II
(E) None of the above

QUESTION 4. All of the following statements are true of a possible mechanism for a reaction excpet one. Which one is NOT true?

(A) A multi-step mechanism will have one step that is rate determining
(B) The mechanism will have steps that sum together to equal the overall reaction
(C) The reaction will have a rate equation that includes only the reactants that appear in the slow step of the mechanism
(D) If intermediates are present in the mechanism they will cancel out when considering the overall equation for the reaction
(E) The reaction will have a rate equation that includes all the reactants that appear in all the steps of the mechanism

QUESTION 5. A possible mechanism for any given chemical reaction;

(A) Can only be determined experimentally
(B) Can be derived from the balanced chemical equation for the reaction
(C) Always has the slowest step first
(D) Must always have at least four steps
(E) May have steps that do not sum to give the overall balanced equation



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