Which of these statements about different forms of carbon is correct?
Graphite and diamond conduct electricity but graphene does not
Graphite and graphene conduct electricity but diamond does not
Graphene and diamond conduct electricity but graphite does not
What is the shape of a nanotube?
Cylinder
Sphere
Flat sheet
How many covalent bonds does each carbon atom in graphite form?
3
4
6
Why is graphene a good conductor of electricity?
It has delocalised electrons that move between its layers
It has ions that are free to move
It has delocalised electrons that are free to move across its surface
Which of these statements best explains why diamond has a high melting point?
It has strong covalent bonds
A large amount of energy is needed to break its strong covalent bonds
A large amount of energy is needed to break its bonds
What is the general formula for an alkane?
CnH2n
CnH2n+2
CnH3n
What is the name of the alkane with the formula C3H8?
Methane
Ethane
Propane
Which of these conditions is required for all types of cracking?
A catalyst
High temperatures
High pressure
What is the name of the process which separates crude oil into simpler mixtures of hydrocarbon compounds?
Cracking
Polymerisation
Fractional distillation
Which of these alkanes has the highest boiling point?
C2H6
C3H8
C4H10