Energetics

Question 1

Lattice enthalpy

Answer 1

1 mol of an ionic compound is formed from its constituent ions in gaseous state

Question 2

Enthalpy change of hydration

Answer 2

Energy change when 1 mole of gaseous ions dissolves in water to form hydrated ions

Question 3

Enthalpy change of solution

Answer 3

Energy change when 1 mole of an ionic compound dissolves in water

Question 4

Average bond enthalpy

Answer 4

The breaking of one mole of bonds in gaseous molecules

Question 5

Explain the differences between enthalpy changes of hydration

Answer 5

smaller ions (smaller ionic radius) 
larger charges on ions 
larger charge and smaller size leads to higher attraction to water molecules

Question 6

standard Enthalpy change of combustion

Answer 6

1 mole of a substance reacts fully with oxygen under standard conditions (298K and 100 kPa)