CAIE A Level Chemistry 9701 · Chemical energetics
The enthalpy change of atomisation, , is one of the energy terms used in a Born-Haber cycle for an ionic compound.
(a) Define the enthalpy change of atomisation, .
(b) In a Born-Haber cycle for sodium chloride, , the enthalpy change of atomisation of sodium is +107 kJ mol. Explain why this value is positive, and state what this term represents in the cycle.
5 marks, so the mark scheme is looking for about 5 separate creditworthy points. Making the same point twice in different words earns it once.
Describe means: Say what happens or what something is like, in order and with detail. You are not being asked why. If there is data, quote it: name the trend, then give figures with units at the points where it changes.
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