enthalpy change definitions

Question 1

enthalpy of formation

Answer 1

enthalpy change when one mole of a substance is formed from its constituent elements with all substances in standard states

Question 2

enthalpy of atomisation

Answer 2

enthalpy change when one mole of gaseous atoms is produced from an element in its standard state

Question 3

bond enthalpy

Answer 3

Bond enthalpy is the potential energy stored in a chemical bond

Question 4

1st electron affinity

Answer 4

enthalpy change when each atom in one mole of gaseous atoms gains one electron to form 1 mole of gaseous 1- ions

Question 5

2nd electron affinity

Answer 5

enthalpy change when each ion in one mole of gaseous 1- ions gains one electron to form 1 mole of gaseous 2- ions

Question 6

lattice enthalpy of formation

Answer 6

enthalpy change when 1 mole of a solid ionic compound is formed from its constituents ions in the gas phase

Question 7

lattice enthalpy of dissociation

Answer 7

enthalpy change when 1 mole of a solid ionic compound is broken up into its constituents ions in the gas phase