Thermodynamics Definitions

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  • Created by: Becca1805
  • Created on: 22-04-15 21:30
Mean Bond Enthalpy
The enthalpy change when one mole of gaseous molecules each breaks a covalent bond to form two free radicals over a range of compounds.
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Standard molar enthalpy of formation
The enthalpy change when one mole of a compound is formed from its constituent elements under standard conditions. All product and reactants in their standard states.Standard enthalpy of formation of an element is, by definition, zero.
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Standard 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
The standard enthalpy change when one mole of gaseous atoms is converted into a mole of gaseous ions each with a single positive charge.
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The first electron affinity
The standard enthalpy change when one mole of gaseous atoms is converted into a mole of gaseous ions each with a single negative charge. Reaction is exothermic.
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The second electron affinity
The enthalpy change when a mole of electrons is added to a mole of gaseous ions each with a single negative charge to form ions each with two negative charges. Reaction is endothermic.
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Lattice formation enthalpy
The standard enthalpy change when one mole of solid ionic compound is formed from its gaseous ions.When a lattice forms, energy is given out so enthalpy change is always negeative.
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Lattice dissociation enthalpy
when one mole of ionic compound separates into its gaseous ions. Opposite process to Lattice formation, therefore value for enthalpy change is the same, but positive.
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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 molecules or ions are far enough apart not to interact with each other.
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Enthalpy Change
Heat energy change measured under constant pressure.
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Standard Enthalpy Change
Heat energy change per mole of a substance measured under standard conditions (100 kPa and 298 K).
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Card 2

Front

The enthalpy change when one mole of a compound is formed from its constituent elements under standard conditions. All product and reactants in their standard states.Standard enthalpy of formation of an element is, by definition, zero.

Back

Standard molar 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

The standard enthalpy change when one mole of gaseous atoms is converted into a mole of gaseous ions each with a single positive charge.

Back

Preview of the back of card 4

Card 5

Front

The standard enthalpy change when one mole of gaseous atoms is converted into a mole of gaseous ions each with a single negative charge. Reaction is exothermic.

Back

Preview of the back of card 5
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