Enthalpy definitions

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Positive Enthalpy
The reaction takes in energy, it is endothermic
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Negative enthalpy
The reaction gives out energy, it is exothermic
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Standard enthalpy of formation
The enthalpy change when one mole of a compound is formed in its standard state from its elements in their standard states
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Standard enthalpy of combustion
The enthalpy change when one mole of a substance undergoes complete combustion in its standard state
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Standard enthalpy of atomisation
The enthalpy change when one mole of gaseous atoms is formed from an element in its standard state
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Bond (disassociation) enthalpy
The energy required to break one mole of gaseous bonds to form gaseous atoms
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Lattice dissociation enthalpy
The enthalpy change when one mole of an ionic lattice dissociates into isolated gaseous ions
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Lattice formation enthalpy
The enthalpy change when one mole of an ionic lattice is formed from its isolated gaseous ions
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Hess's Law
The enthalpy change of a reaction is independent of the path taken
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Card 2

Front

The reaction gives out energy, it is exothermic

Back

Negative enthalpy

Card 3

Front

The enthalpy change when one mole of a compound is formed in its standard state from its elements in their standard states

Back

Preview of the back of card 3

Card 4

Front

The enthalpy change when one mole of a substance undergoes complete combustion in its standard state

Back

Preview of the back of card 4

Card 5

Front

The enthalpy change when one mole of gaseous atoms is formed from an element in its standard state

Back

Preview of the back of card 5
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