Enthalpy

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  • Created by: Aadhil
  • Created on: 20-03-14 20:22
Enthalpy change of formation
The enthalpy change when 1 mole of a compound is formed from its elements in their standard states under standard conditions- Na (s) + ½Cl2 (g)
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Enthalpy of atomisation
Enthalpy of atomisation The enthalpy of atomisation of an element is the enthalpy change when 1 mole of gaseous atoms is formed from the element in its standard state Na (s)
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First Ionisation energy
The first ionisation energy is the energy required to remove 1 mole of electrons from 1 mole of gaseous atoms to form 1 mole of gaseous ions with a +1 charge (under standard conditions) Mg (g)
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First Electron affinity (EXOTHERMIC)
The first electron affinity is the enthalpy change that occurs when 1 mole of gaseous atoms gain 1 mole of electrons to form 1 mole of gaseous ions with a –1 charge (under standard conditions) O (g) + e- -> O-(g)
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Second electron affinity (ENDOTHERMIC)
The second electron affinity is the enthalpy change when one mole of gaseous 1- ions gains one electron per ion to produce gaseous 2- ions. It is endothermic as the additional electron has to overcome repulsion of the anion O- (g) + e- --> O 2- (g)
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Enthalpy of lattice formation
The Enthalpy of lattice formation is the standard enthalpy change when 1 mole of an ionic crystal lattice is formed from its constituent ions in gaseous form (under standard conditions). Na+ (g) + Cl- (g) -> NaCl (s)
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Card 2

Front

Enthalpy of atomisation The enthalpy of atomisation of an element is the enthalpy change when 1 mole of gaseous atoms is formed from the element in its standard state Na (s)

Back

Enthalpy of atomisation

Card 3

Front

The first ionisation energy is the energy required to remove 1 mole of electrons from 1 mole of gaseous atoms to form 1 mole of gaseous ions with a +1 charge (under standard conditions) Mg (g)

Back

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Card 4

Front

The first electron affinity is the enthalpy change that occurs when 1 mole of gaseous atoms gain 1 mole of electrons to form 1 mole of gaseous ions with a –1 charge (under standard conditions) O (g) + e- -> O-(g)

Back

Preview of the back of card 4

Card 5

Front

The second electron affinity is the enthalpy change when one mole of gaseous 1- ions gains one electron per ion to produce gaseous 2- ions. It is endothermic as the additional electron has to overcome repulsion of the anion O- (g) + e- --> O 2- (g)

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