U1S3 covelant bonding Flashcards
1
Q
What is a covelant bond
A
When atoms share electrons
2
Q
What are the characteristics of a simple covalent compound
A
- weak intermolecular forces
- low melting and boiling point
- electrical insulators
3
Q
Structure of graphite
A
- atoms arranged in sheets of flat hexagons
- each carbon atom covalently bonded to three others
- fourth electron delocalised
- sheets held by van der waals forces
4
Q
Properties of graphite
A
- slippery as sheets can slide over eachother
- electric current can flow as electrons can move through
- low density as layers far apart
- high melting point due to strong covalent bonds
- insoluble
5
Q
Structure of diamond
A
- each carbon atom covalently bonded to four other carbon atoms
- carbon atoms arrange themselves in tetrahedral shape
6
Q
Properties of diamond
A
- high melting point
- hard
- thermal conductor as vibrations can travel through
- doesn’t conduct electricity
7
Q
What is a coordinate bond
A
- one atom provides both of the shared electrons
8
Q
When do coordinate bonds form
A
- one of the atoms in the bond has a lone pair of electrons and one doesn’t have any to share
