C3 Allotropes of Carbon

Diamond has a high melting point because each carbon forms ............................ bonds with neighbouring carbon atoms.

• 3 strong covalent

• 4 strong covalent

• 4 weak covalent

• 4 weak intermolecular

Which is a property of diamond?

• strong

• hard

• good conductor of electricity

• soluble in water

What is the structure of diamond?

• giant ionic lattice

• giant metallic lattice

• giant covalent lattice

• simple molecular

Select TWO uses of diamond.

• Making jewellery

• Making musical instruments

• Cutting tools and blade edges

• A lubricant

What is the term used to describe elements which can have different physical forms while being in the same state?

• isotopes

• ions

• molecules

• allotropes

Graphite is a good conductor of electricity because it has ....................................... that .......................................... through the whole structure.

• delocalised electrons

  can move

• delocalised electrons

  cannot move

• bonded electrons

  can move

• bonded electrons

  cannot move

Why is carbon graphite used in pencil lead.

• It has giant structure.

• Each carbon is covalently bonded to 3 other carbon atoms.

• The layers can slide over each other

• It has delocalised electrons.

Graphene is a single layer of graphite just one atom thick.

Which is the best description of graphene.

• high melting point, transparent & very strong

• low melting point,

  transparent & very strong

• high melting point, grey & very strong

• high melting point, transparent & very weak

Why is graphene a good conductor of electricity.

• it has lots of strong covalent bonds

• It has delocalised electrons can move through whole structure.

• It has a giant structure.

• It has ions.

Which diagram shows the structure of diamond?

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