Lattice enthalpy definitions

Question 1

Define Lattice enthalpy

Answer 1

Formation of 1 mole of ionic lattice from gaseous ions under standard conditions

Question 2

What does a more exothermic lattice enthalpy mean?

Answer 2

More exothermic = stringer ionic bonds

Question 3

Why is not possible to measure lattice enthalpy directly

Answer 3

It is not possible to form 1 mole of ionic solid from its gaseous ions

Question 4

Factors that impact lattice enthalpy

Answer 4

size of ions involved
charges on the ions
ionic bond strength

Question 5

which is have a more negative lattice enthalpy

Answer 5

small ions because there is a stronger attraction

Question 6

enthalpy of ionisation

Answer 6

endothermic. enthalpy change when one mole of gaseous ions are formed from 1 mole of gaseous ions

Question 7

enthalpy of formation

Answer 7

exothermic. enthalpy change when one mole of a compound is formed from the elements in their standard states

Question 8

enthalpy of atomisation

Answer 8

formation of ONE atom (often may look strange i.e Cl, not Cl2 or Cl-)

Question 9

enthalpy of electron affinity

Answer 9

opposite of ionisation energy, only for non-metals, adding an electron to a non-metal to form a negative ion.