A2 Definition

Question 1

Lattice enthalpy

Answer 1

Enthalpy change when 1 mole of an ionic lattice is formed from its gaseous ions under standard conditions

Question 2

Enthalpy of formation

Answer 2

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

Question 3

Enthalpy change of reaction

Answer 3

Enthalpy change that accompanies a reaction in the molar quantities shown in a chemical reaction under standard conditions with all reactants and products in their standard states

Question 4

Ionisation energy

Answer 4

Energy required to remove 1 mole of electrons from 1 mole of gaseous atoms

Question 5

Enthalpy of atomisation

Answer 5

Enthalpy change that takes place when one mole of gaseous atoms from from the elements in their standard states

Question 6

Electron affinity

Answer 6

Enthalpy change when one mole of atoms is added to one mole of atoms in a the gaseous phase to form 1 mole of 1- ions

Question 7

Enthalpy of hydration

Answer 7

Enthalpy change when 1 mole of gaseous ions dissolves in water

Question 8

Enthalpy of solution

Answer 8

Enthalpy change when one mole of solution dissolves in water