Enthalpy

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Standard Enthalpy change of Neutralisation
Enthalpy change when one mole of water is formed during the neutralisation between an acid and base under standard conditions 298K and 1 atm.
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Standard Enthalpy change of Formation (∆HΘf)
Enthalpy change when one mole of a pure compound is formed from its constituent elements in their standard states under standard conditions 298K and 1 atm.
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Standard Enthalpy change of Combustion (∆HΘc)
Enthalpy change when one mole of substance is completely burnt with excess oxygen under standard conditions 298K and 1 atm.
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Bond Dissociation Energy (B.E)
Energy required breaking one mole of covalent bonds between 2 atoms in the gaseous state.
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Standard Enthalpy change of Atomisation (∆HΘat)
Enthalpy change when one mole of separate gaseous atoms is produced from the element in its standard states under standard conditions 298K and 1 atm.
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Lattice Energy (L.E)
Enthalpy change when one mole of ionic crystalline solid is formed from its separate gaseous ions under standard conditions
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Ionisation Energy (I.E)
The minimum energy required to remove one mole of electrons from one mole of gaseous atoms producing one mole of gaseous singly charged positive ions.
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Electron Affinity (E.A)
Enthalpy change when one mole of gaseous atoms or negatively charged ion gains one mole of electrons.
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Standard Enthalpy change of Hydration (∆HΘhyd)
Enthalpy change when one mole of free gaseous ions are surrounded by water molecules and form a solution at infinite dilution, under standard conditions 298K and 1 atm.
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Standard Enthalpy change of Solution (∆HΘsoln)
Enthalpy change when one mole of solute is completely dissolved in a solvent to form an infinitely dilute solution under standard conditions 298K and 1 atm.
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Hess’s Law
States that the enthalpy change for a chemical reaction is the same, regardless of the route taken, provided that the initial states of the reactants and the final states of the products are the same.
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Activation Energy, Ea
Minimum amount of energy that reactant particles must possess in order to react
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Card 2

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Enthalpy change when one mole of a pure compound is formed from its constituent elements in their standard states under standard conditions 298K and 1 atm.

Back

Standard Enthalpy change of Formation (∆HΘf)

Card 3

Front

Enthalpy change when one mole of substance is completely burnt with excess oxygen under standard conditions 298K and 1 atm.

Back

Preview of the back of card 3

Card 4

Front

Energy required breaking one mole of covalent bonds between 2 atoms in the gaseous state.

Back

Preview of the back of card 4

Card 5

Front

Enthalpy change when one mole of separate gaseous atoms is produced from the element in its standard states under standard conditions 298K and 1 atm.

Back

Preview of the back of card 5
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