Enthalpy Change Definitions Flashcards Preview

AS OCR A Chemistry > Enthalpy Change Definitions > Flashcards

Flashcards in Enthalpy Change Definitions Deck (8)
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1
Q

Lattice enthalpy

A

Enthalpy change when one mole of a solid lattice is made from it gaseous ions under standard conditions
(Exothermic)
K+(g) + Cl-(g) -> KCl (s)

2
Q

Standard Enthalpy Change of Atomisation

A

1 mole of gaseous atoms made from its elements in standard state
(Endothermic)
K(s)-> K(g)

3
Q

First Ionisation Energy

A

One mole of gaseous 1+ ions formed from gaseous atoms
(Endothermic)
K(g)-> K+(g) +e-

4
Q

Second ionisation energy

A

One gaseous mole of 2+ ions formed from gaseous 1+ ions
Endothermic
K+ -> K+2 + e-

5
Q

First Electron Affinity

A

One mole of gaseous 1- ions formed from gaseous atoms
Exothermic
Cl(g) + e- -> Cl- (g)

6
Q

Second Electron Affinity

A

One mole of gaseous 2- ions made from gaseous -1 ions
Exothermic
Cl-(g) + e- -> Cl2- (g)

7
Q

Standard Enthalpy of Solution

A

One mole of solid dissolved water to form aq ions
(Exo or endo)
KCl(s) + aq -> K+(aq) + Cl-(aq)

8
Q

Standard Enthalpy of Hydration

A

One mole of gaseous ions dissolved to form one mole of aq ions
Exothermic
K+ (g) + aq-> K+ (aq)