Defenitions of Types Of Enthalpy Changes

Question 1

Define Enthalpy change

Answer 1

The heat added to a system at a constant pressure

Question 2

Define the standard enthalpy change of formation

Answer 2

The Enthalpy change when one mole of a substance is formed from it’s constituent elements in their standard states under standard conditions.

Question 3

Define the Enthalpy change of atomisation

Answer 3

This is the Enthalpy change to form one mole of atoms in the gas phase.

Question 4

Define Enthalpy change of lattice formation

Answer 4

This is the Enthalpy change that occurs when one mole of an ionic compound is formed from the ions of the elements in the gas phase.

Question 5

Define Enthalpy change of lattice breaking

Answer 5

This is the enthalpy change that occurs when one mole of an ionic compound is broken up into ions of the elements in the gas phase.

Question 6

Define Enthaply change of hydration

Answer 6

This is the enthalpy change that occurs when one mole of gaseous ions is surrounded by water molecules to make a solution

Question 7

Define Enthalpy change of solution

Answer 7

This is the enthalpy change that occurs when one mole of an ionic compound dissolves in water to form a solution.