Summary EDEXCEL A-LEVEL CHEMISTRY NOTES: ENERGETICS 2

,
, 13 -Energetics 2
hermodynamics Enthalpy
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&H , e fionisation energy)

isionisation enthalpy
energy: change when each arom in I mole

to form I mole of
gaseous
of gaseous atoms loses one electron

long
it



2nd conisation enthalpy
energy: change when each on in

lows
it loses electron to form one
I mole of
Saseous an




mole of
gaseous 2+ ions




* ea /electron affinitel
ist electron enthalpy
affinity: change when each atom in


electron to form one mole
I mole ofsaseous atoms sains one



I-ions/exothermic for Ist, endothermic for 2nd
of gaseous




*atatomisation) -

enthalpy change when I mole of gaseous

its standard State
atoms is produced from an elementin



OHmod-enthalpy change when I mole ofgaseous ions become


hydrated /disolved in waver always exolhermic



Uttsol/solution) -


enthalpy change when I mole ofan ionic

so all
large enough
solid disolves in an amountofwater
do not interact with
dissolved ions are well separated and



each other




AH is /bond dissociation) -


enthalpy chance when I mole covalent
of


bonds is broken in the gaseous state




WH lalt-enthalpy change when one mole ofsolid ionic compound

is formed from its constituentions in gas phase (NH=-iver



WHvap /vaporisation) -
enthalpy change when I mole of
a liquid

is turned into a sas /H=+ivel