Topic 4 Chemical Bonding Test

Which substance can conduct electricity by the movement of ions?

• copper

• graphite

• mercury

• sodium chloride

In which solid can layers slide over each other?

• diamond

• graphite

• haematite

• silica

The compound formed between elements X and Y is ionic. Which statement about elements X and Y is correct?

• X and Y are both at the left-hand side of the Periodic Table

• X and Y are both at the right-hand side of the Periodic Table

• X and Y are both transition elements

• X is at the opposite side of the Periodic Table from element Y

Which molecules all contain one or more double covalent bonds?

• chlorine and nitrogen

• chlorine and oxygen

• oxygen and hydrogen chloride

• oxygen and carbon dioxide

What happens when sodium chloride melts?

• Covalent bonds in a giant lattice are broken

• Electrons are released from atoms

• Electrostatic forces of attraction between ions are overcome

• Molecules are separated into ions

Which substance conducts electricity due to electrons? (Tick 2 boxes)

• aqueous sodium chloride

• copper

• diamond

• graphite

Which statement is correct for all metals?

• They are hard and brittle.

• They are made up of a lattice of positive and negative ions.

• They are made up of a lattice of positive ions surrounded by a sea of delocalised electrons

• They conduct electricity by movement of ions.

Which statement about the structure or bonding of metals is correct?

• A metal lattice consists of atoms in a ‘sea of electrons’.

• Electrons in a metal move randomly through the lattice.

• Metals are malleable because the particles present are mobile.

• The ions in a metal move when positive and negative electrodes are attached.

Which statement explains why aluminium is malleable?

• Aluminium has layers of cations that can slide over one another.

• Aluminium has layers of electrons that can slide over one another.

• Aluminium has weak bonds between protons and a ‘sea of electrons’.

• Aluminium is covered with a layer of unreactive aluminium oxide.

How many pairs of electrons are there in one carbon dioxide molecule?

• 2

• 4

• 8

• 12