Enthalpy definitions

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  • Created by: Naana
  • Created on: 18-05-16 15:19
Define enthalpy of formation
The standard enthalpy change when 1 mole of a compound is formed from its elements. All reactants and products are in their standard states under standard conditions
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Define first ionisation enthalpy
The standard enthalpy change when 1 mole of electrons is removed from 1 mole of gaseous atoms to form 1 mole of gaseous 1+ ions
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Define second ionisation enthalpy
The standard enthalpy change when 1 mole of electrons is removed from 1 mole of gaseous 1 positive ions to form 1 mole of gaseous 2+ ions
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Define enthalpy of atomisation
The standard enthalpy change when 1 mole of gaseous atoms is formed from the elements in its standard state under standard conditions
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Define bond dissociation enthalpy/ bond energy
The standard enthalpy change on breaking 1 mole of a covalent bond in a gaseous molecule to produce 2 gaseous free radicals
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Define mean bond enthalpy
The standard enthalpy change on breaking 1 mole of a covalent bond in a gaseous molecule to produce 2 gaseous free radicals, averaged over a range of compounds
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Define first electron affinity
The standard enthalpy change when 1 mole of gaseous atoms gain 1 mole of electrons to form 1 mole of gaseous 1- ions
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Define second electron affinity
The standard enthalpy change when 1 mole of gaseous 1- ions gain 1 mole of electrons to form 1 mole of gaseous 2- ions
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Define enthalpy of lattice formation
The standard enthalpy change when 1 mole of an ionic crystal lattice is formed from its constituent ions in their gaseous states
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Define enthalpy of lattice dissociation
The standard enthalpy change when 1 mole of an ionic crystal lattice is broken down into its constituent ions in their gaseous states
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Define enthalpy of hydration
The standard enthalpy change when 1 mole of gaseous ions become aqueous ions
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Define enthalpy of solution
The standard enthalpy change when 1 mole of an ionic substance dissolves in a large enough amount of water to ensure that the aqueous ions are well separated and do not interact with one another
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Card 2

Front

The standard enthalpy change when 1 mole of electrons is removed from 1 mole of gaseous atoms to form 1 mole of gaseous 1+ ions

Back

Define first ionisation enthalpy

Card 3

Front

The standard enthalpy change when 1 mole of electrons is removed from 1 mole of gaseous 1 positive ions to form 1 mole of gaseous 2+ ions

Back

Preview of the back of card 3

Card 4

Front

The standard enthalpy change when 1 mole of gaseous atoms is formed from the elements in its standard state under standard conditions

Back

Preview of the back of card 4

Card 5

Front

The standard enthalpy change on breaking 1 mole of a covalent bond in a gaseous molecule to produce 2 gaseous free radicals

Back

Preview of the back of card 5
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