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

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Orders, Rate Equations and Rate Constants
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Formula for reaction rate

Change in conc. / change in time

Order of reaction with respect to reactant A

Power nn in rate ∝\propto [A]n^n

Zero order: effect of conc. on rate

No effect whatsoever

First order: double conc., rate effect

Rate doubles

Second order: double conc., rate effect

Rate quadruples (×4)

Overall order calculation (two reactants m, n)

m+nm + n

Units of kk for first order

s−1\text{s}^{-1}

Units of kk for second order

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

How to determine orders of reaction

Experimentally (not from balanced equation)

General form of rate equation (A and B)

rate =k= k[A]m^m[B]n^n

Explore OCR A-Level Chemistry A Revision Notes by Topics

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Rates of Reactions

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Acids, Bases and pH

Buffers and Neutralisation

Enthalpy and Entropy

Redox and Electrode Potentials

Transition Elements

Explore OCR A-Level Chemistry A Quizzes 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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