AQA A2 Chemistry Enthalpy and Entropy Definitions

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Enthalpy Change
A mesure of the heat energy change at constant pressure
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Standard Enthalpy of Formation
Enthalpy change when one mole of compound is formed from its elements in their standard states under standard conditions
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Standard Enthalpy of Combustion
Enthalpy change at constant pressure when one mole of substance is burned completely in oxygen in their standard states under standard conditions
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Bond Dissociation Enthalpy
Enthalpy change at constant pressure requires to break one mole of gaseous bonds to form gaseous atoms
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Enthalpy of Lattice Dissociation
The enthalpy change when one mole of an ionic solid is seperated into its gaseous ions
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Enthalpy of Lattice Formation
The enthalpy change when one mole of an ionic solid is formed from its gaseous ions
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Enthalpy of Atomisation / Sublimation
The enthalpy change when one mole of gaseous atoms are formed from an element
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Enthalpy of Dissociation
The enthalpy change when one mole of gaseous bonds are broken to form one mole of gaseous element
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Enthalpy of First Ionisation Energy
The enthalphy change when one mole of gaseous atoms have the highest energy electrons removed to form one mole of gaseous ions
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Enthalpy of Electron Affinity
The enthalpy change when one mole of gaseous atoms gain electrons to become gaseous anions, each with a single negative charge
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Enthalpy of Solution
The enthalpy change when one mole of an ionic compound dissolves in excess water
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Enthalpy of Hydration
The energy released when a gaseous ion is dissolved in water
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Card 2

Front

Enthalpy change when one mole of compound is formed from its elements in their standard states under standard conditions

Back

Standard Enthalpy of Formation

Card 3

Front

Enthalpy change at constant pressure when one mole of substance is burned completely in oxygen in their standard states under standard conditions

Back

Preview of the back of card 3

Card 4

Front

Enthalpy change at constant pressure requires to break one mole of gaseous bonds to form gaseous atoms

Back

Preview of the back of card 4

Card 5

Front

The enthalpy change when one mole of an ionic solid is seperated into its gaseous ions

Back

Preview of the back of card 5
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