Unit 5 - Energy Key Words

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  • Created by: Sofalof
  • Created on: 27-04-15 16:51
Lattice enthalpy
The enthalpy change that accompanies the formation of one mole of an ionic compound from its gaseous ions under standard conditions
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Hess' law
If a reaction can take place by more than one route and the initial and final conditions are the same, the total enthalpy change is the same for each route
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Standard enthalpy change of formation
The enthalpy change that takes place when one mole of a compound is formed from its constituent elements in their standard states under standard conditions
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Enthalpy change of atomisation
The enthalpy change that takes place when one mole of gaseous atoms forms from the element in its standard state
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First ionisation energy
The enthalpy change accompanying the removal of one electron from each atom in one mole of gaseous atoms to form one mole of gaseous 1+ ions
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Second ionisation energy
The enthalpy change accompanying the removal of one electron from each ion in one mole of gaseous 1+ ions to form one mole of gaseous 2+ ions
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First electron affinity
The enthalpy change accompanying the addition of one electron to each atom in one mole of gaseous atoms to form one mole of gaseous 1- ions
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Second electron affinity
The enthalpy change accompanying the addition of one electron to each ion in one mole of gaseous 1- ions to form one mole of gaseous 2- ions
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Standard enthalpy change of solution
The enthalpy change that takes place when one mole of a compound is completely dissolved in water under standard conditions
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Standard enthalpy change of hydration
The enthalpy change that takes place when one mole of isolated gaseous ions is dissolved in water forming one mole of aqueous ions under standard conditions
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Entropy
The quantitative measure of the degree of disorder in a system
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Standard entropy change of reaction
The entropy change that accompanies a reaction in the molar quantities expressed in a chemical equation under standard conditions, all reactants and products being in their standard states
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Free energy change
The balance between enthalpy, entropy and temperature for a process
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Oxidation
Loss of electrons, or an increase in oxidation number
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Reduction
Gain of electrons, or a decrease in oxidation number
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Standard electrode potential of a half cell
The e.m.f. of a half cell compared with a standard hydrogen half cell, measured at 298K with solutions concentrations of 1mol/dm³ and a gas pressure of 1atm
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Card 2

Front

If a reaction can take place by more than one route and the initial and final conditions are the same, the total enthalpy change is the same for each route

Back

Hess' law

Card 3

Front

The enthalpy change that takes place when one mole of a compound is formed from its constituent elements in their standard states under standard conditions

Back

Preview of the back of card 3

Card 4

Front

The enthalpy change that takes place when one mole of gaseous atoms forms from the element in its standard state

Back

Preview of the back of card 4

Card 5

Front

The enthalpy change accompanying the removal of one electron from each atom in one mole of gaseous atoms to form one mole of gaseous 1+ ions

Back

Preview of the back of card 5
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