ALLOTROPES OF CARBON

Giant Covalent Structures are vast networks of ___ bonded atoms

• covalently

• ionically

• mechanically

• weakly

Giant covalent structures such as __ and sand have a very __ melting and boiling points and are usually ___

• diamond

• carbon dioxide

• high

• low

• hard

Graphite, diamond and Buckminsterfullerene are all allotropes of

• Berylium

• Silicon

• Germanium

• Carbon

Giant covalent structures generally ____ conduct electricity

• can

• cannot

• always

• normally

______ is the only non-metal to conduct electricity

• diamond

• silicon

• germanium

• graphite

_____ can conduct electricity because it has _____ _____

• diamond

• graphite

• localised electrons

• delocalised electrons

Allotropes of carbon have the same chemical properties because they have

• the same number of electrons

• the same number of valence electrons

• different number of electrons

• the same number of protons

Graphite is soft because

• it has strong covalent bonds

• its layers can slide over one another due to weak forces between the layers

• it has weak van der Waals forces between layers

• it is used as a lubricant

Diamond is used for cutting glass because it is

• hard and strong

• soft

• shiny

• unreactive

Why is diamond hard and strong? It has

• weak intermolecular forces

• weak covalent bonds

• strong covalent bonds

• van der Waals forces of attraction