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EnglandChemistryQuick questions
Topic 12: Thermodynamics (Energetics II)
Quick questions on Thermodynamics - Energetics II (Topic 12) - Edexcel A-Level Chemistry
3short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What are born-Haber cycles?Show answer
To build the cycle, draw the elements at the bottom, form gaseous atoms (atomisation), then gaseous ions (ionisation and electron affinity), and finally bring the gaseous ions together to form the solid lattice (lattice energy). By Hess's law, the direct formation enthalpy equals the sum of all the steps, so any one unknown can be found by difference.
What is q1?Show answer
State the equation for Gibbs free energy and the condition for feasibility. [2 marks]
What is q2?Show answer
Explain why the lattice energy of magnesium oxide is more exothermic than that of sodium chloride. [2 marks]
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