Rate-Determining Step (OCR A-Level Chemistry A): Quizzes

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Rate-Determining Step
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Why are single-step collisions involving five particles extremely unlikely?

All particles colliding at once is rare

What is the rate-determining step in a multi-step reaction?

The slowest step that controls rate

What controls the overall rate of a multi-step reaction?

The slowest step in the sequence

Which species appear in the rate equation?

Only those in rate-determining step

If rate = k[A]2[B]k[A]^2[B], how many particles are in the slow step?

Two A particles and one B particle

If OH−\text{OH}^- has order zero, when does it react?

In a fast step after the slow step

What is an intermediate in a reaction mechanism?

A species formed then consumed

How many particles typically collide in each step of a reaction mechanism?

Two (or occasionally three)

What can a rate equation NOT do for a proposed mechanism?

Prove the mechanism is correct

For (CH3)3CBr(CH_3)_3CBr with rate = k[(CH3)3CBr]k[(CH_3)_3CBr], what is the slow step?

(CH3)3CBr→(CH3)3C++Br−(CH_3)_3CBr \rightarrow (CH_3)_3C^+ + Br^-

Explore OCR A-Level Chemistry A Revision Notes by Topics

Rates of Reactions

Equilibrium

Acids, Bases and pH

Buffers and Neutralisation

Enthalpy and Entropy

Redox and Electrode Potentials

Transition Elements

Explore OCR A-Level Chemistry A Model Answers by Topics

Rates of Reactions

Equilibrium

Acids, Bases and pH

Buffers and Neutralisation

Enthalpy and Entropy

Redox and Electrode Potentials

Transition Elements

Explore OCR A-Level Chemistry A Flashcards by Topics

Rates of Reactions

Equilibrium

Acids, Bases and pH

Buffers and Neutralisation

Enthalpy and Entropy

Redox and Electrode Potentials

Transition Elements

Explore OCR A-Level Chemistry A Exam Questions by Topics

Rates of Reactions

Equilibrium

Acids, Bases and pH

Buffers and Neutralisation

Enthalpy and Entropy

Redox and Electrode Potentials

Transition Elements

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