Enthalpy Change Definitions

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  • Created by: Emma
  • Created on: 17-02-14 15:19
Enthalpy Change
When we measure a heat change at constant pressure we call it enthalpy change.
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Enthalpy of Formation
The enthalpy change when one mole of a compound is formed from its consituent elements under standard conditions, all reactants and products in their standard states.
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Enthalpy of Atomisation
The enthalpy change which accompanies the formation of one mole of gaseous atoms from the element in its standard state under standard conditions.
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First ionisation energy
Standard enthalpy change when one mole of gaseous atoms is converted into one mole of unipositive gaseous ions.
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First electron affinity
Standard enthalpy change when a mole of gaseous atoms is converted to a mole of gaseous ions, each with a single -ve charge.
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Second electron affinity
Enthalpy change when a mole of electrons is added to a mole of gaseous ions each with a single -ve charge to form ions each with 2 x -ve charges.
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Lattice formation enthalpy
Standard enthalpy change when one mole of solid ionic compound is formed from its gaseous ions.
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Enthalpy of hydration
Standard enthalpy change when water molecules surround one mole of gaseous ions
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Enthalpy of solution
Standard enthalpy change when one mole of solute dissolves completely in sufficient solvent to form a solution in which the particles are far enough apart not to interact with each other.
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Mean bond enthalpy
Enthalpy change when one mole of gaseous molecules each breaks a covalent bond to form two free radicals, averaged over a range of compounds.
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Card 2

Front

The enthalpy change when one mole of a compound is formed from its consituent elements under standard conditions, all reactants and products in their standard states.

Back

Enthalpy of Formation

Card 3

Front

The enthalpy change which accompanies the formation of one mole of gaseous atoms from the element in its standard state under standard conditions.

Back

Preview of the back of card 3

Card 4

Front

Standard enthalpy change when one mole of gaseous atoms is converted into one mole of unipositive gaseous ions.

Back

Preview of the back of card 4

Card 5

Front

Standard enthalpy change when a mole of gaseous atoms is converted to a mole of gaseous ions, each with a single -ve charge.

Back

Preview of the back of card 5
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