Enthalpy Definitions

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  • Created by: Emilie
  • Created on: 25-02-15 17:07
Enthalpy change
Heat energy change under standard conditions
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Standard enthalpy change
Change in enthalpy when reactants in their standard states form products that are also in their standard states
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Standard state
When a substance, at a given temperature (usually 298 K), is at its pure, most stable form at 100 kPa
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Standard enthalpy of formation
Enthalpy change under standard conditions when one mole of a compound is formed from its elements with all reactants and products in their standard states
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Ionisation enthalpy
Standard molar enthalpy change for the removal of an electron from a species in the gas phase to form a positive ion and an electron, also in the gas phase
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Enthalpy of atomisation
Standard enthalpy change that accompanies the formation of one mole of gaseous atoms from the element in its standard state
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Bond dissociation enthalpy
Standard molar enthalpy change that accompanies the breaking of a covalent bond in a gaseous molecule to form two gaseous free radicals
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Free radical
A species that results from homolytic fission of a covalent bond
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Electron affinity
Standard enthalpy change when an electron is added to an isolated atom in the gas phase
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Enthalpy of lattice formation
The standard enthalpy change that accompanies the formation of one mole of a solid ionic lattice from its gaseous ions
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Enthalpy of lattice dissociation
The standard enthalpy change that accompanies the separation of one mole of a solid ionic lattice into its gaseous ions
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Enthalpy of hydration
The standard enthalpy change when water molecules surround one mole of gaseous ions
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Enthalpy of solution
The standard enthalpy change that occurs when one mole of an ionic solid dissolves in enough water to ensure that the dissolved ions are well separated and do not interact with one another
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Card 2

Front

Change in enthalpy when reactants in their standard states form products that are also in their standard states

Back

Standard enthalpy change

Card 3

Front

When a substance, at a given temperature (usually 298 K), is at its pure, most stable form at 100 kPa

Back

Preview of the back of card 3

Card 4

Front

Enthalpy change under standard conditions when one mole of a compound is formed from its elements with all reactants and products in their standard states

Back

Preview of the back of card 4

Card 5

Front

Standard molar enthalpy change for the removal of an electron from a species in the gas phase to form a positive ion and an electron, also in the gas phase

Back

Preview of the back of card 5
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