definitions

Question 1

enthalpy change of hydration

Answer 1

dissolving 1 mol of gaseous ions in water,

Question 2

enthalpy change of neutralisation

Answer 2

formation of 1 mol of water from neutralisation, in its standard states under standard conditions

Question 3

enthalpy change of formation

Answer 3

formation of 1 mol of a compound from its elements, in its standard states under standard conditions

Question 4

enthalpy change of combustion

Answer 4

complete combustion of 1 mol of a substance, in its standard states under standard conditions

Question 5

lattice enthalpy

Answer 5

formation of 1 mol of ionic lattice from gaseous ions

Question 6

enthalpy change of solution

Answer 6

dissolving of 1 mol of solute

Question 7

first ionisation energy

Answer 7

removal of 1 mol of electrons from 1 mol of gaseous atoms to form one mol of gaseous 1+ ions

Question 8

enthalpy change of atomisation

Answer 8

formation of 1 mol of gaseous atoms from the element in its standard states under standard conditions

Question 9

first electron affinity

Answer 9

1 electron is added to each atom in 1 mol of gaseous atoms to form one mole of gaseous 1- ions