Enthalpy Definitions

Question 1

Enthalpy change of solution

Answer 1

The enthalpy change when 1 mole of a solute is completely dissolved in water under standard conditions

Question 2

Enthalpy change of hydration

Answer 2

The enthalpy change when 1 mole of gaseous ions are dissolved in water to form hydrated ions

Question 3

Lattice enthalpy

Answer 3

The enthalpy change when 1 mole of an ionic compound is formed from its gaseous ions

Question 4

Enthalpy change of neutralisation

Answer 4

The enthalpy change when 1 mole of water is formed from a neutralisation reaction

Question 5

Enthalpy change of combustion

Answer 5

The enthalpy change when 1 mole of a substance is completely combusted

Question 6

Enthalpy change of formation

Answer 6

The enthalpy change when 1 mole of a compound is formed from its constituent elements in their standard states

Question 7

Enthalpy change of atomisation

Answer 7

The enthalpy change when 1 mole of gaseous atoms are formed from its element in its standard state

Question 8

Ionisation energy

Answer 8

The enthalpy change when 1 mole of gaseous +1 ions are formed from gaseous atoms

Question 9

Electron Affinity

Answer 9

The enthalpy change when 1 mole of gaseous -1 ions are formed from its gaseous atoms

Question 10

Average bond enthalpy

Answer 10

The enthalpy change when 1 mole of bonds are broken in gaseous molecules