Bonding Flashcards
How are covalent bonds frormed
By atoms sharing electrons
Which type of atoms form covalent bonds between them
Non metals
Describe the structure and bonding of a giant covalent substance
Billions of atoms bonded together by strong covalent bonds
Why do giant covalent substances have a high melting point
It takes a lot of energy to break the strong covalent bonds between the atoms
Why do small molecules have a low melting point
Only a small amount of energy is needed to break the weak intermolecular forces
Why do large molecules have a h8igher melting and boiling point than small molecules
The intermolecular forces are stronger in large molecules
Why do most covalent substances not conduct electricity
Do not have delocalised electrons or ions
Describe the structure and bonding in graphite
each carbon atom is bonded to three others in hexagonal rings arranged in layers - it has delocalised electrons and weak forces between the layers
Why can graphite conduct electricity
The delocilised electrons can move through the graphite
Why is graphite soft
Layers are nit bonded so can slide over each other
What is graphene
One layer of graphite
