Chemistry 3.6 - Enthalpy Changes

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In Born Haber cycles, if the arrows go up the reaction is...
ENDOTHERMIC
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In Born Haber cycles, if the arrows go down the reaction is...
EXOTHERMIC
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Equation for the enthalpy change of solution?
Enthalpy of solution = Enthalpy of lattice dissociation + enthalpy of hydration.
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If the enthalpy of hydration is greater than the enthalpy of lattice dissociation...
The compound will dissolve.
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How does the size of an ion affect the enthalpy of hydration?
As the ion gets larger its attraction to solvent molecules decreases. Therefore, this weaker attraction means less energy is released upon hydration. THE ENTHALPY OF HYDRATION DECREASES.
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How does the size of an ion affect the enthalpy of lattice dissociation?
As an ion gets larger it has a lower charge/volume ratio. Larger ions are held together by weaker forces of attraction and so less energy is required to overcome these forces. THE ENTHALPY OF LATTICE DISSOCIATION DECREASES.
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How does the charge of an ion affect the enthalpy of hydration and lattice dissociation?
They both increase.
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What does a negative enthalpy of formation value show?
That the compound produced is more stable that its elements.
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What does a positive enthalpy of formation value show?
The compound produced is less stable than its elements.
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Card 2

Front

In Born Haber cycles, if the arrows go down the reaction is...

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EXOTHERMIC

Card 3

Front

Equation for the enthalpy change of solution?

Back

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Card 4

Front

If the enthalpy of hydration is greater than the enthalpy of lattice dissociation...

Back

Preview of the front of card 4

Card 5

Front

How does the size of an ion affect the enthalpy of hydration?

Back

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