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Hess cycles, bond enthalpies and lattice energetics · A Level Chemistry · Courselo

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Physical chemistry: energetics, kinetics and equilibria

Hess cycles, bond enthalpies and lattice energetics

Physical chemistry: energetics, kinetics and equilibria · Lesson 2 of 10

Lesson 2 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 energeticsReading · 0%
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 treatment2 h 30 min of study

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

Lesson 2 of 10 · Physical chemistry: energetics, kinetics and equilibria

Hess cycles, bond enthalpies and lattice energetics

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

Apply Hess’s law to calculate unknown enthalpy changes from known enthalpy data, including formation and combustion cycles.
Construct and interpret Hess cycles using correct state symbols, directions and algebraic signs.
Use mean bond enthalpies to estimate enthalpy changes of reactions by comparing bonds broken and bonds formed.

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Adaptive questions on hess cycles, bond enthalpies and lattice energetics.

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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

Define lattice enthalpy and distinguish between lattice formation enthalpy and lattice dissociation enthalpy.

Construct and use Born–Haber cycles to calculate lattice enthalpy or related quantities such as electron affinity and enthalpy of formation.

Explain discrepancies between theoretical and experimental lattice enthalpy values in terms of ionic size, charge density and covalent character or polarisation.

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