Flashcards in Thermodynamics Deck (18)
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1
Define enthalpy change of formation
Enthalpy change when one mole of a substance is formed from its constituent elements with all substance in their substances
-exothermic
2
Define enthalpy change of combustion
Enthalpy change when one mole of a substance undergoes complete combustion in oxygen with all substances in standard states
-exothermic
3
Define enthalpy of neutralisation
enthalpy change when 1 mole of water is formed in a reaction between an acid and alkali under standards conditions
-exothermic
4
Define 1st ionisation enthalpy
Enthalpy change when each atom in one mole of gaseous atoms loses one electron to form one mole of gaseous 1+ ions
-endothermic
5
Define 2nd ionisation energy
Enthalpy change when each ion in one mole of gaseous 1+ ions loses one electron to form one mole of gaseous 2+ ions
-endothermic
6
Define 1st electron affinity
Enthalpy change when each atom in one mole of gaseous atoms gains one electron to form one mole of gaseous 1-ions
exothermic
7
Define 2nd electron affinity
Enthalpy change when each ion in one mole of gaseous ions gains one electron to form one mole of gaseous 2- ions
endothermic
8
Define enthalpy change of atomisation
Enthalpy change when one mole of gaseous atoms is produced from an element in its standard state
-endothermic
9
Define hydration enthalpy
Enthalpy change when one mole of gaseous ions become hydrated(dissolved in water)
-exothermic
10
Define enthalpy of solution
Enthalpy change when one mole of an ionic solid dissolves in an amount of water large enough so that the dissolved ions are well separated and do not interact with each other
exothermic/endothermic
11
Define bond dissociation enthalpy
Enthalpy change when one mole of covalent bond is broken in the gaseous state
-endothermic
12
Define lattice enthalpy of formation
Enthalpy change when one mole of a solid ionic compound is formed from into its constituent ions in the gas phase
exothermic
13
Define lattice enthalpy of disassociation
Enthalpy change when one mole of a solid ionic compound is broken up into its constituent ions is the gas phase
endothermic
14
Enthalpy change of vaporisation
Enthalpy change when one mole of a liquid is turned into a gas
endothermic
15
Define enthalpy of fusion
Enthalpy change when one mole of a solid is turned into a liquid
endothermic
16
Define bond enthalpy
Mean value across a range of compounds containing that bond
17
Define enthalpy change
The heat change measured under conditions of constant pressure
18
