Lattice Energy

Question 1

definition of change of atomization

Answer 1

1. one mole of gaseous atoms formed
2. from its element
3. under standard conditions

Question 2

2 facts about electron affinity

Answer 2

1. first electron affinity is always exothermic

2. after that its always endothermic

Question 3

definition of lattice energy

Answer 3

1. one mole of ionic compound
2. formed from its gaseous atoms
3. under standard conditions

Question 4

2 formulas of lattice energy

Answer 4

1. hydration = lattice+solution

2. lattice = formation-1

Question 5

factors affecting lattice energy and how

Answer 5

1. size: inversely proportional (as size increases, lattice energy become less exo)
2. charge: directly proportional (as charge increases, lattice energy become more exo)

Question 6

solubility of sulfates

Answer 6

1. decreases down the group
2. cationic size increases
3. hydration energy decreases more than lattice energy
4. energy of solution become less exothermic

Question 7

what happens to group 2 polarizing power going down the group

Answer 7

decreases

Question 8

thermal stability of carbonates and nitrates

Answer 8

1. increases down the group
2. ion polarization decreases
3. cation size increases
4. distortion of the anion decreases

Question 9

trend in electron affinities down group 6 and 7

Answer 9

decreases down the group cz atomic size increases

Question 10

define enthalpy change of hydration

Answer 10

1. one mol of gaseous ions
2. are dissolved in water
3. under standard conditions

Question 11

relation between atomic radius and enthalpy of hydration

Answer 11

inversely proportional

Question 12

solubility of hydroxides down group 2

Answer 12

1. increases down the group
2. lattice energy decreases more than hydration
3. energy of solution becomes more exothermic