Ionic compound and properties

Positive ions are formed when ..................... atoms ..................... electrons

• metal, gain

• metal, lose

• non metal, gain

• non metal, lose

Negative ions are formed when ..................... atoms ..................... electrons

• metal, gain

• metal, lose

• non metal, gain

• non metal, lose

The attraction between positive ions and negative ions is called

Each aluminium atom lose 3 electrons to achieve full outer shell.

Each oxygen atom gain 2 electrons to achieve full outer shell.

What is the correct ratio of Aluminium ion and Oxide ion in a compound of aluminium oxide.

• 1 aluminium ion : 3 oxide ion

• 2 aluminium ion : 3 oxide ion

• 1 aluminium ion : 1 oxide ion

• 3 aluminium ion : 2 oxide ion

Ionic compounds form

• giant ionic lattice structure

• simple ionic lattice stucture

• complex ionic lattice sctructure

Select the properties that belong to ionic compounds

• high melting and boiling points

• can dissolve in water

• dissolve in organic solvent

• conduct electricity when solid

• conduct electricity only when molten or when in aqueous state

Solid aluminium oxide, Al₂O₃, cannot conduct electricity when solid because

• the Al³⁺ and O^2- ions are not mobile

• the Al³⁺ and O^2- ions are mobile

• the Al³⁺ and O^2- ions are free moving in solid

Solid sodium chloride, NaCl, cannot conduct electricity when solid. What can be done in order to increase electrical conductivity?

• dissolve the salt in water

• melt the salt and change it to molten

• dissolve the salt in petroleum

• heat the salt so that there are more space between the particles

There are strong electrostatic forces of attraction between oppositely charged ions throughout the lattice structure. This is an explanation to why giant ionic lattice have

• low melting point

• high melting point

• can conduct electricity when molten

Giant lattice structure is formed by ............................... arrangement of ................................... positive and negative ions

• regular, alternating

• non regular, non alternating