Rate-determining step and reaction mechanisms Quiz
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5 questions, one answer each
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1. A reaction has rate = k[X]². How many X particles are in the rate-determining step?
- A. One
- B. Two
- C. Three
- D. None
2. A mechanism has a slow step A + B → C + D followed by a fast step C + B → E. What is the predicted rate equation?
- A. rate = k[A]
- B. rate = k[A][B]²
- C. rate = k[A][B]
- D. rate = k[C][B]
3. A tertiary halogenoalkane is hydrolysed with rate = k[RX]. Which mechanism does this support?
- A. SN1
- B. SN2
- C. Free-radical substitution
- D. Electrophilic addition
4. The iodination of propanone is zero order with respect to iodine. What does this show?
- A. Iodine is in the slow step
- B. Iodine reacts only after the rate-determining step
- C. Iodine is the catalyst
- D. Iodine is not a reactant
5. What is an intermediate?
- A. A catalyst that is regenerated
- B. A species in the overall equation
- C. A species present only in the slow step
- D. A species formed in one step and used up in a later step