Orders, Rate Equations and Rate Constants (OCR A-Level Chemistry A): Quizzes

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Orders, Rate Equations and Rate Constants
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What are the units of reaction rate when time is measured in seconds?

mol dm−3⋅s−1\text{mol dm}^{-3} \cdot \text{s}^{-1}

What happens to rate when conc doubles in a zero order reaction?

Rate stays exactly the same

If concentration doubles in a first order reaction, how does the rate change?

Rate doubles

If conc triples in a second order reaction, what happens to rate?

Rate increases nine-fold

What must be determined experimentally in a rate equation?

Orders of reaction

What is the overall order if m=1m = 1 and n=2n = 2 in rate = k[A]m[B]nk[A]^m[B]^n?

3

What are the units of kk for a second order reaction?

dm3⋅mol−1⋅s−1\text{dm}^3 \cdot \text{mol}^{-1} \cdot \text{s}^{-1}

How do you determine order experimentally from data?

Compare expts where one conc changes

What does a larger value of rate constant kk indicate?

A faster reaction

If conc halves in 2nd order reaction, what is rate factor change?

0.25 (becomes a quarter)

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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