module 6 (p3) Flashcards
1
Q
define lattice enthalpy
A
enthalpy change when 1 mole of an ionic compound is formed from its gaseous ions in standard conditions
2
Q
what are properties of lattice enthalpy
A
can’t directly measure
enthalpy cycle is the born-haber cycle
3
Q
define enthalpy change of atomisation
A
enthalpy change when 1 mole of gaseous atoms are formed form their elements in standard state
4
Q
define electron affinity
A
enthalpy change when every atom in 1 mole of gaseous atoms acquires an electron to form 1 mole of gaseous ions
5
Q
why is the first electron affinity exothermic and the second endothermic
A
1st EA – no repulsion because the atom isn’t ionised yet
2nd EA – electron repulsion to the ion
