Module 3 Book 5 - Enthalpy Changes
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9 Terms
Activation energy
The minimum energy required to start a reaction by breaking bonds
ΔrH (reaction)
The enthalpy change associated with a stated equation (in their standard states under standard conditions if theta present)
ΔfH (formation)
The enthalpy change when one mole of a compound is made from its elements
ΔcH (combustion)
The enthalpy change when one mole of a substance is completely combusted with oxygen
ΔneutH (neutralisation)
The enthalpy change when an aqueous acid is neutralised by an aqueous base, forming one mole of water
Average bond enthalpy
The average enthalpy change when breaking 1 mole of a given type of bond in the molecules of a gaseous species (always positive as bond breaking is endothermic)
Hess' law
The enthalpy change of a reaction is independent of the route taken, providing the initial and final conditions are the same.
ΔcH data is given
Arrows point down TO combustion products
ΔfH data is given
Arrows point up to reactants and products FROM combustion products