Structure of diamond and graphite

Name the element that makes up diamond and graphite.

• Hydrogen

• oxygen

• carbon

• carbon dioxide

Choose the property of diamond shown here.

• It conducts electricity.

• It does not conduct electricity

• It is soft.

• It has weak covalent bonds.

In diamond each carbon atom is bonded with ................ carbon atoms.

• 3

• 2

• 7

• 4

Choose the property of graphite shown below.

• It is hard.

• It conducts electricity.

• It has ionic bonds.

• It has low melting point.

Diamond and Graphite has .................................................. structure.

• Giant covalent structure

• Giant ionic lattice structure

• Simple molecular structure

• Giant metallic structure

Why is diamond hard?

• Due to many electrons.

• Due to strong covalent bonds between carbon atoms.

• Due to complete outer shell of carbon atom.

• Due to free moving electrons in the structure.

Graphite is soft because.....................

• There is strong covalent bonds.

• There is free moving electron in each carbon atom.

• It has high melting point.

• It has weak forces of attraction between the layers.

Graphite conducts electricity due to the............................

• presence of delocalised or free moving ions between the layers.

• presence of delocalisedor free moving electrons that move between the layers.

• due to the covalent bonds.

• due to the high melting point.

Diamond does not conduct electricity because............................

• it is hard

• it has no free moving electrons as the all the outer electrons in carbon atom are involved in bonding.

• it is soft

• it is made up of ions