Enthalpy

Question 1

Define the standard enthalpy of formation

Answer 1

The enthalpy change that takes place when one mole of a compound is formed from its elements under standard conditions, with all reactants and products in their standard states.

Question 2

Define the standard enthalpy of atomisation

Answer 2

The enthalpy change that takes place for formation of one mole of gaseous atoms from the element in its standard state under standard conditions.

Question 3

Define the 1st ionisation energy

Answer 3

The enthalpy change that requires to remove 1 electron from each atom in one mole of gaseous atoms to form 1 mole of 1+ ions.

Question 4

Define the 1st electron affinity

Answer 4

The enthalpy change that takes place when one electron is added to each atom in one mole of gaseous atoms to form one mole of gaseous 1- ions.

Question 5

Define the lattice enthalpy

Answer 5

The enthalpy change that accompanies the formation os one mole of an ionic compound from its gaseous ions under standard conditions.