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

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Born-Haber Calculations
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What do Born-Haber calculations determine for ionic compounds?

Lattice enthalpy

Why are Born-Haber cycles needed to find lattice enthalpy?

It cannot be measured directly

Which law is applied in Born-Haber cycle calculations?

Hess's Law

What is enthalpy of formation (ΔfH∘\Delta_f H^\circ)?

Energy when 1 mole of compound forms from elements

What is ionisation energy (ΔiH∘\Delta_i H^\circ)?

Energy to remove electrons from gas atoms

What is electron affinity (ΔeaH∘\Delta_{ea} H^\circ)?

Energy when electrons added to gas atoms

What sign are exothermic enthalpy values in Born-Haber cycles?

Negative

What is the equation for sodium atomisation in the NaClNaCl cycle?

Na(s) → Na(g)\text{Na(s) → Na(g)}

For NaClNaCl: ΔHf=−411\Delta H_f = -411, atomisation +229+229, ionisation +496+496, ΔHea=−349\Delta H_{ea} = -349. Find lattice enthalpy.

-787 kJ/mol

What is enthalpy of atomisation (ΔatH∘\Delta_{at} H^\circ)?

Energy to convert elements to gas atoms

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