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11 Cards in this Set
- Front
- Back
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Give the definition of enthalpy change.
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Enthalpy change is the amount of heat evolved or absorbed in a given reaction under standard conditions.
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What is the standard enthalpy change of atomisation?
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It has the symbol ΔHat and it is the enthalpy change for when a solid is changed to a gas.
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What is the standard enthalpy of ionisation?
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The symbol is ΔHi and it represents the enthalpy change for when an element loses it's first electron (it would be the second ionisation energy for the element losing it's second electron)
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What is the standard enthalpy change of electron affinity?
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It's symbol is ΔHe and it is the enthalpy change for when an element gains one electron.
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What is the standard enthalpy change of lattice formation?
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It's symbol is ΔHlatt and it is the enthalpy change for the formation of a lattice from it's ions. i.e Na+ + Cl- to make a NaCl lattice.
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What is the standard enthalpy change of formation?
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It's symbol is ΔHf and it is the enthalpy change for the formation of a compound from it's elements.
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What can the value of ΔHf tell you about the stability of the compound?
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A highly -ve value tells us that a compound is very likely to be stable.
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What is the enthalpy change of solution?
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ΔHsol is the enthalpy change for when a solid dissolves and becomes a solution.
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What is the enthalpy change of lattice breaking?
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ΔHlatt breaking is the enthalpy change for when a lattice of ions is broken up.
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What is the enthalpy change of hydration?
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ΔHhyd is the enthalpy change for when ions are surrounded by water molecules and so they become hydrated.
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How would you calculate ΔHsol?
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ΔHlatt breaking + ΔHhyd
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