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Energy Definitions |
It should be noted that many of
the energy definitions can be considered in the reverse direction
with a corresponding change of sign for the energy. Bond formation
= exothermic ΔH negative, bond cleavage = endothermic ΔH
positive |
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Enthalpy of vaporisation |
The energy required to vaporise one mole of a liquid |
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Enthalpy of atomisation |
The energy required to produce one mole of gaseous atoms
from an element in its standard state |
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Bond dissociation enthalpy |
The energy change when one mole of a specific bond in
a given molecule is broken or created |
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Bond enthalpy |
The average energy change when one mole of a specific
type of bond is broken or created. |
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Enthalpy of Combustion |
The energy released when one mole of a compound
is burned in excess oxygen |
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Enthalpy of formation |
The energy change when one mole of a compound is formed
from its constituent elements in their standard states |
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Enthalpy of solution |
The energy change when one mole of a substance is dissolved
in an infinite amount of water |
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Hydration enthalpy |
The energy change when a particle is taken from infinite
separation in the gaseous state to its position in an aqueous lattice |
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Ionisation energy |
The energy required to produce one mole of gaseous ions
from one mole of gaseous atoms by removal of one mole of electrons |
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Lattice enthalpy |
The energy change when one mole of an ionic substance is broken
into its constituent atoms at infinite separation.
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