Allotropes of carbon

What are allotropes?

• Different structural forms of the same element in the same physical state.
• Different elements in the same state
• Different states of the same element
• Different compounds of the same element

Which of the following is NOT an allotrope of carbon?

• Sodium chloride
• Graphite
• Diamond
• Fullerenes

What structure do carbon atoms form in diamond?

• A regular 3D pattern
• A flat sheet
• Random arrangement
• Hexagonal layers

Why is diamond very hard?

• Due to strong covalent bonds between atoms
• It has a soft structure
• It contains metal atoms
• It contains free electrons

How many carbon atoms does each carbon atom bond with in graphite?

• Three
• Four
• One
• Two

What is the primary reason graphite can conduct electricity?

• Delocalized electrons that can move freely
• Its structure is liquid
• It has no electrons
• It contains metal impurities

What is graphene?

• A single layer of graphite
• A type of diamond
• A gas form of carbon
• A carbon compound

What happens to the melting point of graphite due to its structure?

• It has a high melting point
• It has a low melting point
• It melts at room temperature
• It cannot melt

What are fullerenes?

• Spherical and tubular structures made of carbon
• Solid carbon crystals
• A type of gas
• Liquid carbon

Why does diamond not conduct electricity?

• It has no free electrons or ions
• It is a liquid
• It is a metal
• It has too many electrons