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WorksheetsC2 Covalent bonding
Total questions: 15
Worksheet time: 11mins
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
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
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
What type of substance are methane and water?
Giant covalent molecules
Simple covalent molecules
Giant ionic lattice
Metallic structure
Describe the structure of simple covalent molecules
Strong covalent bonds between atoms, weak forces holding the molecules together
Weak covalent bonds between atoms, weak forces holding the molecules together
Weak covalent bonds between atoms, strong forces holding the molecules together
Strong covalent bonds between atoms, strong forces holding the molecules together
What are intermolecular forces?
Strong forces between molecules which keep them apart
Weak forces between molecules which keep them apart
Strong forces between molecules which hold them together
Weak forces between molecules which hold them together
Explain why methane has a low melting point
It is a simple molecular substance with weak forces between the molecules (which are easy to break)
It is a simple molecular substance with strong forces between the molecules (which are difficult to break)
What is a polymer?
A single small molecule
A type of plastic
Millions of small molecules joined together in a chain to form a large molecule
