22.1 Lattice enthalpy

Question 1

what is lattice enthalpy?

Answer 1

enthalpy change when one mole of a solid ionic compound is formed from gaseous ions

Question 2

is lattice enthalpy endothermic or exothermic?

Answer 2

it involves bond formation so exothermic
as energy is given out

Question 3

what are the 4 key enthalpy changes?

Answer 3

enthalpy change of formation
enthalpy change of atomisation
first ionisation energy
first electron affinity

Question 4

what is the enthalpy change of formation?

Answer 4

energy change when one mole of a compound is formed from its constituent elements under standard conditions

Question 5

what is the enthalpy change of atomisation?

Answer 5

energy change when one mole of gaseous atoms is formed form the element in standard state

Question 6

what is the first ionisation energy?

Answer 6

energy required to remove one electron from each atom in one mole of gaseous atoms to form one mole of gaseous +1 ions

Question 7

what is the opposite of ionisation energy?

Answer 7

electron affinity

Question 8

what is the first electron affinity?

Answer 8

energy required to add one electron to each atom in one mole of gaseous atoms to form one mole of gaseous -1 ions