Carbon nanotubes are cylinders made of carbon atoms. They are a type of fullerene.
In a nanotube, each carbon atom is covalently bonded to three other carbon atoms.
Nanotubes are very strong and conduct electricity.
Which explanation is correct?
Each carbon atom forms four covalent bonds, so the nanotube is strong and all of the outer electrons are free to move.
The nanotube is held together by strong intermolecular forces, and it contains ions that can move along the tube.
The nanotube has strong covalent bonds between its carbon atoms, and it has delocalised electrons that can move along the tube.
The nanotube is a three-dimensional giant structure like diamond, so it has delocalised electrons that can move through it.
60 exam-style questions on OCR GCSE Chemistry 2.3 Properties of materials, covering 2.3.1 Carbon bonding and the variety of organic compounds, 2.3.2 Diamond, graphite, fullerenes and graphene, 2.3.3 Bond strength, changes of state and predicting states, 2.3.4 Bulk properties and types of bonding, and 2.3.5 Nanoparticles: scale, surface area, uses and risks. Each one has a worked solution and a mark scheme showing where the marks go.