C2 Covalent bonding

Explain why chlorine and fluorine form covalent bonds

• They are both metals

• They are both non-metals

• One is a metal and one is a non-metal

• They are both semi-metals

Complete the sentence: In covalent bonds, electrons are _______________________

• Lost

• Gained

• Halved

• Shared

What is the name given to the structure of diamond, graphite and silicon dioxide?

• Mega covalent structure

• Mega ionic lattice

• Giant covalent

• Giant ionic

Tags

NGSS.HS-PS1-3

How many bonds does each carbon have in diamond?

• 2

• 4

• 6

• 8

Explain why diamond has a high melting point

• Giant structure, strong covalent bonds between the atoms, requires a lot of energy to break

• Giant structure, weak covalent bonds between the atoms, requires little energy to break

• Mega structure, strong covalent bonds between the atoms, requires a lot of energy to break

• Mega structure, weak covalent bonds between the atoms, requires little energy to break

Tags

NGSS.HS-PS1-3

Explain why most giant covalent substances do not conduct electricity.

• There are no electrons/ions/charged particles that are free to move

• The electrons/ions/charged particles that are free to move

• The electrons/ions/charged particles cannot carry the charge

• There are not enough electrons/ions/charged particles to carry the charge through the structure

Explain why graphite conducts electricity

• It is made of metal ions

• It has delocalised electrons between the layers that can move through the graphite

• Each carbon atom has 4 electrons on its outer shell, it uses all 4 electrons to conduct electricity

• The ions are free to move

Explain why graphite can act as a lubricant

• The carbon atoms in graphite cause very little friction.

• The carbon atoms are in a liquid state

• Weak forces between carbon atoms are free to slide over each other

• Weak forces between layers which are free to slide over each other

What is graphene?

• A sphere shaped structure of carbon atoms

• Several layers of graphite

• One layer of graphite

• A tube shaped layer of carbon atoms

What is a fullerene?

• Substance made of carbon atoms arranged in a cage

• Several layers of graphite

• One layer of graphite

• A tube shaped layer of carbon atoms