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

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Born-Haber Cycles
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What law is the Born-Haber cycle an application of?

Hess's Law

What can Born-Haber cycles be used to calculate?

Lattice enthalpies

Why must lattice enthalpies be calculated indirectly using Born-Haber cycles?

They cannot be measured directly

What is enthalpy of formation (ΔfH°\Delta_fH°)?

1 mole compound from elements in standard states

What is enthalpy of atomisation (ΔatH°\Delta_{at}H°)?

1 mole gaseous atoms from element in standard state

What is ionisation enthalpy (ΔieH°\Delta_{ie}H°)?

Electrons removed from 1 mole gaseous atoms

What is electron affinity (ΔeaH°\Delta_{ea}H°)?

Electrons added to 1 mole gaseous atoms

What is lattice enthalpy (ΔlattH°\Delta_{latt}H°)?

1 mole compound formed from gaseous ions

Why do Group 2 compounds like MgCl2MgCl_2 need extra steps in Born-Haber cycles?

Second ionisation energy needed

Why is electron affinity doubled for MgCl2MgCl_2 in Born-Haber cycles?

2 moles Cl−Cl^- form per mole Mg2+Mg^{2+}

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