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2.1 Thermochemistry - DEFINITIONS
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Cards (7)
Bond enthalpy
The amount of energy required to
break
one
mole
of the stated bond in the gas phase
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Enthalpy change (ΔH)
The
heat energy change
measured under a
constant pressure
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Enthalpy change of reaction
The
enthalpy change
when quantities of
substances
in standard states react completely
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Enthalpy of combustion
The enthalpy change when one mole of a substance is
burned
in
excess oxygen
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Hess's
law
The
enthalpy
change of a reaction is
independent
of the route taken
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Mean bond enthalpy
The
enthalpy
change when one mole of a specified
covalent
bond is broken averaged out across the range of compounds
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Standard enthalpy of formation (ΔH)
The
enthalpy
change when
one mole
of a substance in its standard state under standard conditions is formed from its elements under standard conditions
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