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15. Chemical Kinetics

Reaction Mechanism

15. Chemical Kinetics

Reaction Mechanism

Multiple Choice
Consider the following elementary steps:
NO₂ (g) + NO₂ (g) → NO₃ (g) + NO (g) [SLOW]
NO (g) + CO₃ (g) → N (g) + CO₄ (g) [FAST]
What is the rate law of the reaction mechanism?
Multiple Choice
The following reaction of 2 Br₂ (g) + 2 NO (g) → N₂ (g) + 2 Br₂O (g) has the following rate law:Rate = k [Br₂][NO]². The proposed mechanism for the reaction is:
Br₂ (g) + NO₂ (g) → N (g) + Br₂O (g) [SLOW]
N (g) + NO (g) → N₂ (g) + O (g) [FAST]
O (g) + Br₂ (g) → Br₂O (g) [FAST]
Which of the following statements is/are false?
a) The rate determining step is bimolecular.
b) There are three elementary steps in the reaction mechanism.
c) The mechanism possesses a catalyst.
d) O is the only reaction intermediate in this reaction mechanism.
e) This is not a valid mechanism for the reaction.
Multiple Choice
A mechanism for a naturally occurring reaction that destroys ozone is given by the following steps:Step 1: O3(g) + HO(g) → HO2(g) + O2(g)Step 2: HO2(g) + O(g) → HO(g) + O2(g)What is the molecularity of the overall reaction?
Multiple Choice
Consider the following three-step mechanism for a reaction: Step 1: Cl2(g) ⇌ 2Cl(g) (fast) Step 2: Cl(g) + CHCl3(g) → HCl(g) + CCl3(g) (slow) Step 3: Cl(g) + CCl3(g) → CCl4(g) (fast). Which species are intermediates in this mechanism?