Lattice Enthalpy Flashcards
1
Q
what factors affect LE ?
A
- ionic charge = greater charge = greater attraction so stronger ion cbond so more exo LE
- size of ion = smaller ion = greater sttraction = more exo LE
2
Q
definition of lattice enthalpy
A
- enthalpy change when 1 mole of a solid ionic compound is formed from its gaseous ions
3
Q
definition of enthalpy change of atomisation
A
- enthalpy change when 1 mole of gaseous atoms is formed from its elements in their standard state
4
Q
definition of electron affinity
A
- energy required to add 1 electron to each atom in 1 mole of gaseous atoms
5
Q
why is second EA endothermic
A
because energy required to overcome repulsion between e- and 1- ion
6
Q
definition of enthalpy change of solution
A
- enthalpy change when 1 mole of a solute is dissolved in a solvent
7
Q
definition of enthalpy change of hydration
A
- enthalpy change when 1 mol of gaseous ions dissolved in water
8
Q
equations for LE
A
LE = formation - sum of everything else
sol = -LE + hyd
