Lattice Enthalpy 5.2.1 Flashcards
What is the definition of Lattice Enthaply of Formation?
The enthalpy change when one mole of an iovic lattice is formed from its isolated gaseous ions.
Can Lattice enthalpy be measured?
No
It has to be calculated using a Born-Haber cycle
What does an ions Lattice Enthalpy depend on?
Charge Density
Charge and Size
High Lattice Enthalpy causes a high what?
A high Melting point
A greater charge causes what?
A higher Lattice Enthalpy
A greater atomic radius causes what?
A lower Lattice Enthalpy
What is the Enthalpy of Atomisation?
The energy required to turn one mole of an element from its standard state at RTP to a dissociated gas
What is an Ionisation Energy?
The energy required to remove one mole of electrons from one mole of atoms/ions
What is an Electron Affinity?
The energy change when one mole of electrons is captured by one mole of atoms.
What is the Enthalpy of Formation?
The energy change when one mole of compound is formed in standard conditions
Σ of what = Σ of what?
Σ clockwise = Σ anticlockwise
What is the definition of Enthalpy of Hydration?
The energy change when one mole of seperated gaseous ions are dissolved completely in water to form one mole of aqueous ions.
What is the Enthalpy of Solution?
The energy change when one mole of an ionic substance is dissolved in a volume of water large enough to ensure that the ions are seperated and do not interact with each other.
What happens to Enthalpy of Hydration when the charge of an ion increases?
It increases as it has a greater attraction to the water as it is a polar molecule
