5.2.1.4 covalent bonding Flashcards
What is covalent bonding
This happens between two metals. The model looks like a vent diagram where electrons are shared. This forms molecules either small covalent molecules or large covalent structures
How many electrons are being shared in
A) singular bonds
B) double bonds
C) triple bonds
2
4
6
What are the properties of small ( simple) molecules?
Gas / liquid,
Low melting points
Weak intermolecular forces which are easier to break
What are the properties of giant molecules
High melting points
Diamond, Silicon Dioxide (sand), Graphite
Strong intermolecular forces which are harder to break
Usually hard, strong or soft
Which of the three giant molecules is arranged in hexagonal columns?
Graphite
What elements make up the molecule graphite
Carbon (each atom bonded to 3 others)
State properties of the molecule graphite
High melting point
Conducts electricity
Soft sliding layers- contains delocalised electrons which can move, producing a charge.
What elements makes up the molecule silicon dioxide?
Oxygen and silicon
State properties of silicon dioxide
High melting point
Doesn’t conduct electricity
Insoluble
Each atom is bonded to 4 other atoms
Draw the molecule of silicon dioxide
Should look like the molecule of silicon dioxide
What elements make up the molecule diamond
Carbon
State properties of the molecule diamond
Hard and strong,
insoluble
Does not conduct electricity
High melting point
Each atom bonded to 4 other atoms
Draw the molecule of diamond
Should look like the molecule diamond
What was the first fullerene discovered?
It was called the buckminsterfullerene
What is a fullerene
60 carbon atoms arranged in a spherical structure
