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Rate equations, orders, mechanisms and Arrhenius treatment · A Level Chemistry · Courselo

Courselo

Chemistry
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Physical chemistry: energetics, kinetics and equilibria

Rate equations, orders, mechanisms and Arrhenius treatment

Physical chemistry: energetics, kinetics and equilibria · Lesson 5 of 10

Lesson 5 of 10

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Unit 2

Physical chemistry: energetics, kinetics and equilibria

10 lessons · 16 h 45 min of study

Enthalpy changes and calorimetry1 h 30 min of study
Hess cycles, bond enthalpies and lattice energetics2 h of study
Entropy and Gibbs free energy1 h 45 min of study
Reaction rates and collision theory1 h 15 min of study
Rate equations, orders, mechanisms and Arrhenius treatmentReading · 0%

This unit is ≈20% of the Chemistry, across 10 lessons. Full syllabus

Lesson 5 of 10 · Physical chemistry: energetics, kinetics and equilibria

Rate equations, orders, mechanisms and Arrhenius treatment

3 quick checks≈3% of the testStretch: Stretch: harder material that separates the top grades

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By the end you’ll be able to

Determine the order with respect to a reactant and the overall order from initial-rate data or other kinetic evidence, and write the corresponding rate equation.
Calculate the rate constant $k$ from rate data and concentrations, including correct units for different overall orders.

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Adaptive questions on rate equations, orders, mechanisms and Arrhenius treatment.

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Dynamic equilibrium and Le Chatelier’s principle1 h 15 min of study

Equilibrium constants Kc and Kp1 h 45 min of study

Acids, bases and pH calculations1 h 45 min of study

Weak acids, buffers and titration curves2 h of study

Solubility product and precipitation equilibria1 h of study

Interpret the effect of changing concentration on rate for zero-, first- and second-order behaviour and identify order from concentration-time, rate-concentration or half-life information.

Use half-life relationships for first-order reactions and, where required by the specification, apply integrated first-order treatment such as plotting appropriate linear graphs.

Relate a proposed reaction mechanism to the observed rate equation and identify the rate-determining step consistent with kinetic data.

Use the Arrhenius equation in qualitative and quantitative form to explain temperature dependence of rate constants and to calculate activation energy from data, including use of $\ln k$ against $\dfrac{1}{T}$ where required.

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