Lattice Energy

Question 1

What is lattice formation enthalpy

Answer 1

Energy released when 1 mole ionic solid is formed from its gaseous anion and cation

Question 2

Factors affecting lattice energy

Answer 2

Charge of the ion
Size of ionic radius

Question 3

What is enthalpy change of formation

Answer 3

When 1 mole of a compound is formed by it’s constituent elements in the standard state under standard condition

Question 4

What is enthalpy change of atomisation

Answer 4

When 1 mole of gaseous atom is formed from its constituent elements in there standard state under standard condition

Question 5

What is ionisation energy

Answer 5

The amount of energy required to remove 1 mole of electrons from 1 mole of neutral gaseous atom to give a positive ion

Question 6

What is electron affinity

Answer 6

The amount of energy released when 1 mole of electrons is absorbed in 1 mole of gaseous atom to give a negative ion

Question 7

Factors affecting electron affinity

Answer 7

Nuclear charge
Atomic size
Shielding effect

Question 8

Why do some elements have a negative first ionisation energy and then a positive second ionisation energy

Answer 8

As the ion is a highly negatively charged particle to overcome the repulsion they absorb energy