Born-Haber Calculations (AQA A-Level Chemistry): Flashcards

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Born-Haber Calculations
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Purpose of Born-Haber calculations

Determine lattice enthalpy of ionic compounds

Law applied in Born-Haber cycles

Hess's Law

Enthalpy of Formation (ΔfH∘\Delta_f H^{\circ})

Energy change: 1 mol compound forms from elements in standard states

Ionisation Energy definition

Energy to remove electrons from gaseous atoms to form positive ions

Enthalpy of Atomisation meaning

Energy to convert elements to gaseous atoms

Electron Affinity definition

Energy released when gaseous atoms gain electrons to form negative ions

Sign for exothermic values in Born-Haber

Negative

Sign for endothermic values in Born-Haber

Positive

How to find lattice enthalpy in Born-Haber cycle?

Apply Hess's Law using known enthalpy values

Lattice enthalpy of NaClNaCl (from example)

-787 kJ/mol

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Thermodynamics (A Level only)

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Electrode Potentials & Electrochemical Cells (A Level only)

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Explore AQA A-Level Chemistry Exam Questions by Topics

Thermodynamics (A Level only)

Rate Equations (A Level only)

Equilibrium constant (Kp) for Homogeneous Systems (A Level only)

Electrode Potentials & Electrochemical Cells (A Level only)

Fundamentals of Acids & Bases (A Level only)

Further Acids & Bases Calculations (A Level only)

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