FC8 Ionic Bonding 1

Question 1

Ionic bonding

Answer 1

Electrostatic attraction between oppositely charged ions to form a giant ionic lattice structure

Question 2

Electrostatic attraction between oppositely charged ions to form a giant ionic lattice structure

Answer 2

Ionic bonding

Question 3

Why do ionic compounds have high melting points

Answer 3

A lot of energy is needed to break many strong ionic bonds to separate the oppositely charged ions in the giant ionic lattice structure. The higher the charges of the ions, the greater the attraction and therefore the higher the melting point

Question 4

Describe the electrical conductivity of ionic compounds as a solid and in aqueous/molten

Answer 4

Solid ionic compounds DO NOT conduct electricity because the ions are fixed in position in the giant ionic lattice structure and there are no mobile ions
Molten and dissolved ionic compounds can conduct electricity because the ions are mobile and can flow to the relevant electrodes

Question 5

Define exothermic in terms of bonds and energy

Answer 5

Bond forming - energy released

Question 6

Define endothermic in terms of bonds and energy

Answer 6

Bond breaking - energy put in

Question 7

Explain what happens to ions when an ionic compound dissolves in water

Answer 7

The ions separate, to x+ and y- ions and are then surrounded by water molecules