What is Hess' law?
Hess' law states that the overall enthalpy change for a reaction is independent of the route taken.
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What enthalpy changes do the arrows A-D represent?
AEnthalpy of atomisation.
BIonisation energy.
CLattice enthalpy.
DEnthalpy of formation.
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What do the directions of the arrows tell you about the enthalpy changes they represent?
Arrows pointing up represent endothermic (positive) enthalpy changes.
Arrows pointing down represent exothermic (negative) enthalpy changes.
The total enthalpy change for the formation of the ionic lattice is the same for whichever route (red or blue) is taken.
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What does the vertical scale of a Born-Haber cycle represent?
Enthalpy (kJ mol-1)
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