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Physical Chemistry (PI4.1 Enthalpy changes for solids and solutions)

Quick questions on Enthalpy Changes for Solids and Solutions (PI4.1) - Eduqas A-Level Chemistry

4short 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 is second electron affinity is endothermic?
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Adding an electron to a 1−1- ion (to make O2−\text{O}^{2-}) is endothermic because it is repelled by the negative ion; only the first electron affinity is exothermic.
What is born-Haber arithmetic?
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Set the cycle out carefully and watch every sign; a single sign slip on ionisation or electron affinity gives the wrong lattice enthalpy.
What is q1?
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State two factors that make a lattice enthalpy more exothermic. [2 marks]
What is q2?
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Explain why the enthalpy of hydration of Mg2+\text{Mg}^{2+} is more exothermic than that of Na+\text{Na}^+. [2 marks]

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