Lattice enthalpy

Question 1

define lattice enthalpy

Answer 1

enthalpy of formation of 1 mol. of an ionic lattice from gaseous ions

Question 2

what does lattice enthalpy measure

Answer 2

the strength of ionic bonding in a giant ionic lattice

Question 3

is LE exo/endothermic

Answer 3

exothermic

Question 4

what does route 1 in the Born Haber cycle include

Answer 4

formation of gaseous atoms

formation of gaseous ions

lattice enthalpy

Question 5

what does route 2 in the Born Haber cycle include

Answer 5

enthalpy formation directly to LE

Question 6

define standard enthalpy of formation

Answer 6

the enthalpy change when 1 mol. of compound is formed from its elements under standard conditions and states

Question 7

is enthalpy of formation exo/endothermic?

Answer 7

exothermic

Question 8

define standard enthalpy change of atomisation

Answer 8

enthalpy change when 1 mol. of gaseous atoms are formed from its elements under standard conditions and states

Question 9

is enthalpy change of atomisation endo/exothermic

Answer 9

endothermic

Question 10

why is enthalpy change of atomisation endothermic

Answer 10

bonds are broken to form gaseous atoms

bond enthalpy of the bond is broken

Question 11

define first ionisation energy

Answer 11

when 1 e- is removed from each atom in 1 mol. of gaseous atoms to form 1 mol. of gaseous 1+ ions

Question 12

is first ionisation energy exo/endothermic

Answer 12

endothermic

Question 13

why is first ionisation energy endothermic

Answer 13

energy needed to overcome attraction btwn -ve e- and +ve nucleus

Question 14

define first e- affinity

Answer 14

when one e- is added to each atom in 1 mol. of gaseous atoms to form 1 mol. of gaseous 1- ions

Question 15

is first e- affinity exo/endothermic

Answer 15

exothermic bcs e- added is attracted to nucleus