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Chemical Reaction Mechanisms

Chemistry ⇒ Chemical Reactions and Equations

Chemical Reaction Mechanisms starts at 11 and continues till grade 12. QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Chemical Reaction Mechanisms. How you perform is determined by your score and the time you take. When you play a quiz, your answers are evaluated in concept instead of actual words and definitions used.
See sample questions for grade 12
A reaction mechanism consists of the following steps: Step 1: NO2 + F2 → NO2F + F (slow); Step 2: NO2 + F → NO2F (fast). Identify the intermediate.
Define the term 'intermediate' in the context of a reaction mechanism.
Describe how experimental rate laws help in proposing a reaction mechanism.
Describe the difference between a reaction intermediate and a catalyst.
Describe the difference between a unimolecular and a bimolecular elementary reaction.
Describe the role of a catalyst in a reaction mechanism.
Explain why a proposed mechanism that does not match the experimental rate law is considered invalid.
Explain why a proposed reaction mechanism must be consistent with the experimentally determined rate law.
Explain why intermediates are usually not detected in the final products of a reaction.
Explain why the molecularity of an elementary reaction cannot be greater than three.
Explain why the rate law for a reaction is usually determined by the slowest step in the mechanism.
Given the following mechanism: Step 1: 2A → B + C (slow); Step 2: B + D → E (fast). What is the molecularity of the first step?
Given the following mechanism: Step 1: A + B → C (slow); Step 2: C + D → E (fast). What is the rate law for the overall reaction?
In a two-step reaction mechanism, if the first step is slow and the second is fast, which step determines the rate law?
In the reaction mechanism: Step 1: Cl2 → 2Cl (fast); Step 2: Cl + CH4 → HCl + CH3 (slow); Step 3: CH3 + Cl2 → CH3Cl + Cl (fast). What is the catalyst, if any?
What is meant by the term 'reaction mechanism' in chemistry?
Which of the following is a possible mechanism for the reaction 2NO2 → 2NO + O2? (1) NO2 + NO2 → NO + NO3 (slow); NO3 → NO + O2 (fast), (2) NO2 → NO + O (slow); O + NO2 → NO + O2 (fast)