Enthalpy

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Total cards: 24•Content version: v4•Public deck•Updated: 8/1/2026

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Front (Question)

enthalpy of formation

Back (Answer)

enthalpy change when one mole of a substance is formed form its constituent elements with all substances in their standard conditions - exothermic (generally)

Front (Question)

enthalpy of combustion

Back (Answer)

enthalpy change when one mole of a substance undergoes complete combustion in oxygen with all substances in standard states - exothermic

Front (Question)

enthalpy of neutralisation

Back (Answer)

enthalpy change when 1 mole of WATER is formed in a reaction between an acid and an alkali under standard conditions - exothermic

Front (Question)

ionisation enthalpy (first)

Back (Answer)

enthalpy change when one mole of gaseous atoms loosed one election to from one more of gaseous 1+ ions - endothermic

Front (Question)

ionisation enthalpy (second)

Back (Answer)

enthalpy change when one mole of gaseous 1+ ions loosed one election to from one more of gaseous 2+ ions - endothermic

Front (Question)

electron affinity (first) exo/endo?

Back (Answer)

enthalpy change when each atom in one mole of gaseous atoms gains one electron to become 1- ions - exothermic

Front (Question)

electron affinity (second)

Back (Answer)

enthalpy change when each atom in one mole of gaseous 1- ions gains one electron to become 2- ions - endothermic

Front (Question)

enthalpy of atomisation

Back (Answer)

enthalpy change when one mole of gaseous atoms is produced from an element in its standard state - endothermic

Front (Question)

hydration enthalpy

Back (Answer)

enthalpy change when one mole of gaseous ions becomes hydrated (dissolves in water) - exothermic

#10

Front (Question)

enthalpy of solution

Back (Answer)

enthalpy change when one mole of an ionic solid dissolves in an amount of water large enough so that all the dissolved ions are well separated and do not interact with each other (dissociated ions) -varies

#11

Front (Question)

bond dissociation enthalpy

Back (Answer)

enthalpy change when one mole of covalent bonds is broken in the gaseous state - endothermic

#12

Front (Question)

lattice enthalpy of formation

Back (Answer)

enthalpy change when one mole of a solid ionic compound is formed from its constituent ions in GAS state - exothermic

#13

Front (Question)

lattice enthalpy of dissociation

Back (Answer)

enthalpy change when one mole of solid ionic compound is broken up into its constituent ions in their GAS state - endothermic

#14

Front (Question)

enthalpy of vaporisation

Back (Answer)

energy change when one mole of a liquid is turned into a gas - endothermic

#15

Front (Question)

enthalpy of fusion

Back (Answer)

energy change when one mole of a solid is turned into a liquid - endothermic

#16

Front (Question)

average bond enthalpy

Back (Answer)

the average enthalpy change that takes place when breaking by homiletic fission 1 mol of a given type of bond in the molecules of a gaseous species

#17

Front (Question)

bond dissociation enthalpy

Back (Answer)

the enthalpy change when 1 mol of a given bond in the molecules of a gaseous species is broken by homiletic fission

#18

Front (Question)

overall enthalpy change (eq)

Back (Answer)

[sum of enthalpy of formation product] - [sum of enthalpy of formation of reactants]

#19

Front (Question)

Hess’ law

Back (Answer)

if a reaction takes place by 2 routes, and starting and finishing conditions are the same the total enthalpy change will be the same for each route

#20

Front (Question)

symbol for enthalpy

Back (Answer)

#21

Front (Question)

units of enthalpy

Back (Answer)

kJmol-1

#22

Front (Question)

value of ΔH when reaction is exothermic

Back (Answer)

negative

#23

Front (Question)

value of ΔH when reaction is endothermic

Back (Answer)

positive

#24

Front (Question)

enthalpy

Back (Answer)

energy stored within the bonds