Designing Materials

Define the term allotropes

• Atoms with same proton number but different number of neutrons
• Atoms with same proton number but different mass number
• Atoms in different arrangement in structure
• Atoms in different arrangement and different physical form

Graphene is a good conductor because

• free moving electrons
• free delocalization of electrons in its structure
• free delocalized electrons in 2D structure
• free delocalized electrons in 3D

Why graphene is a better conductor compared to C₆₀?

• More delocalized electrons in graphene
• Electron move easily in graphene
• Electron move easily due to its planar flat structure
• Electron movement easier due to weak attraction with nuclei

What structure is shown in the diagram?

• Diamond
• Graphite

Tags

NGSS.HS-PS1-3

Slippery

• diamond
• graphite

Tags

NGSS.HS-PS1-3

Conduct electricity

• diamond
• graphite
• both

Tags

NGSS.HS-PS2-6

Atoms arranged in layers

• diamond
• graphite

drill bits (construction tools)

• diamond

• graphite

Tags

NGSS.HS-PS2-6

Which consists of carbon atoms?

• graphite
• diamond
• fullerene
• all of these

Which has a free delocalized electron between layers that gives rise to electrical conductivity ?

• graphite
• diamond
• fullerene
• none of these