AQA Chem5 Definitions

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First Ionisation Enthalpy
Enthalpy change when one mole of gaseous atoms loses one electron per atom to produce gaseous 1+ atoms. E.g. Mg(g) -> Mg+(g) + e-
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Enthalpy of combustion
Enthalpy change when one mole of a substance undergoes complete combustion in oxygen. E.g. 2Na(s) +1/2O2 -> Na2O(s)
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Enthalpy of formation
Enthalpy change when one mole of a substance is formed from its elements in their standard states. E.g. H2 + 1/2O2 -> H2O
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Lattice enthalpy of formation
Enthalpy change when one mole of a solid ionic compound is formed from its ions in the gas phase. Bonds formed; exothermic reaction. E.g. Na+(g) + Cl-(g) -> NaCl(s)
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Second ionisation enthalpy
Enthalpy change when one mole of gaseous 2+ atoms is produced from one mole of 1+ ions. E.g. Na+(g) -> Na2+(g) + e-
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Lattice enthalpy of dissociation
Enthalpy change when one mole of a solid ionic compound is split into its ions in the gas phase. Bonds broken; endothermic reaction. E.g. NaCl(s) -> Na+(g) + Cl-(g)
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Enthalpy of solution
Enthalpy change when one mole of an ionic solid dissolves to form aqueous ions that do not interact. E.g. NaCl(s) -> Na+(aq) + Cl-(aq)
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Bond dissociation enthalpy
Enthalpy change when one mole of covalent bonds is broken in the gaseous state. Breaking bonds; endothermic reaction. E.g. I2(g) -> 2I(g)
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Hydration enthalpy
Enthalpy change when one mole of gaseous ions become hydrated (dissolved in water) to form one mole of aqueous ions. Exothermic reaction. E.g. Mg2+(g) -> Mg2+(aq)
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First electron affinity
Enthalpy change when one mole of gaseous atoms gains one electron per atom to produce gaseous 1- ions. E.g. Cl(g) + e- -> Cl-(g)
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Second electron affinity
Enthalpy change when one mole of gaseous 1- ions gains one electron per ion to produce gaseous 2- ions. E.g. O-(g) + e- -> O2-(g)
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Enthalpy of atomisation
Enthalpy change when one mole of gaseous atoms is produced from an element in its standard state. E.g. 1/2 I2(s) -> I(g)
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Other cards in this set

Card 2

Front

Enthalpy change when one mole of a substance undergoes complete combustion in oxygen. E.g. 2Na(s) +1/2O2 -> Na2O(s)

Back

Enthalpy of combustion

Card 3

Front

Enthalpy change when one mole of a substance is formed from its elements in their standard states. E.g. H2 + 1/2O2 -> H2O

Back

Preview of the back of card 3

Card 4

Front

Enthalpy change when one mole of a solid ionic compound is formed from its ions in the gas phase. Bonds formed; exothermic reaction. E.g. Na+(g) + Cl-(g) -> NaCl(s)

Back

Preview of the back of card 4

Card 5

Front

Enthalpy change when one mole of gaseous 2+ atoms is produced from one mole of 1+ ions. E.g. Na+(g) -> Na2+(g) + e-

Back

Preview of the back of card 5
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