born haber cycle

Question 1

define enthalpy change of atomisation

Answer 1

enthalpy change when one mole of gaseous atoms is formed from the element in its standard state in standard conditions of 100kPa and 298K

Question 2

define first ionisation energy

Answer 2

energy required to remove an electron from each atom of one mole of gaseous atoms to form one mole of gaseous +1 ions

Question 3

define first electron affinity

Answer 3

energy required to add an electron to each atom of one mole of gaseous atoms to form one mole of gaseous -1 ions

Question 4

define lattice enthalpy of formation

Answer 4

enthalpy change when one mole of an ionic lattice is formed from it gaseous ions under standard conditions

Question 5

define enthalpy change of solution

Answer 5

enthalpy change when one mole of an ionic compound compound completely dissolves in water to form one mole of aqueous ions

Question 6

define enthalpy change of hydration

Answer 6

enthalpy change when one mole of gaseous ions dissolve completely in water to form one mole fo aqueous ions

Question 7

what are the factors affecting lattice enthalpy?

Answer 7

• ionic size

- ionic charge

Question 8

why is lattice enthalpy of formation exothermic?

Answer 8

• involves ionic bond formation from oppositely charged ions so doesn’t require much energy input

Question 9

how does ionic size affect lattice enthalpy?

Answer 9

• as the ionic size increases
• attraction between the ions increase
• lattice enthalpy becomes less exothermic
• melting point decreases

Question 10

how does ionic charge affect lattice enthalpy?

Answer 10

• as the ionic charge increases
• attraction between the ions increase
• lattice enthalpy becomes more exothermic
• melting point increases