covelant bonding Flashcards
1
Q
covelant bonding is between what
A
non metal + non metal
2
Q
the bonds
A
the bonds are very very very strong (even stronger than ionic)
3
Q
properties
A
- low mpt
- can’t conduct
- solubility
- in water : not much
- in organic solvents : yes
4
Q
why is there a low mpt
A
only has to break IMF
IMF are very weak
- don’t need much energy to break - low mpt
5
Q
3 giant covelants
A
graphite
diamond
silicon dioxide
6
Q
giant covelant structure
A
giant covelant network (like a lattice)
7
Q
gc - graphite
A
- layers of c arranged in hexagons
- each c has formed 3 bonds
- used 3 of its outer e
- one e left over - this e is delocalised between layers
- can move
8
Q
gc - diamond
A
- forms a pyramid shape (tetrahedron)
- each c forms 4 bonds
- no spare e
- cannot conduct
- no spare e
- need to break more bonds
- higher mpt than graphite
9
Q
melting points of all bonding
A
strongest = covelant
= ionic
= metallic
weakest = imf