Covalent Bonding Flashcards
What do non-metals do when they bond?
They share pairs of electrons
Definition of covalent bonding
The electrostatic attraction between protons in two nuclei and a shared pair of electrons between them
Covalent bonding is a very ______ attraction
strong
a small group of atoms held together by covalent bonds is called a…
simple molecule
What happens when simple molecular substances boil?
The weak intermolecular forces break.
as molecular mass increases, so does the strength of the weak IMFs which results in…
the boiling point increasing
Why do simple molecular substances never conduct electricity?
Electrical conductivity requires charged particles that can move freely, and there are any charged particles because they are neutral.
Why is fullerene a soft and slippery solid?
because the molecules can roll over each other easily
Diamond properties in lattice
Every C makes 4 covalent bonds
Tetrahedral shape
Strong, grid-like arrangement
Diamond sublimes at a very high temperatures because:
Covalent bonds are very strong
There are lots of bonds in the giant lattice
Lots of energy is required to break all the bonds
What is diamond used for and why
It is used for cutting as it is one of the hardest substances.
Graphite lattice
layers of hexagons of C atoms
every C makes 3 covalent bonds
weak IMFs between layers
delocalised electrons inside each layer
Graphite sublimes at high temperature because:
Covalent bonds are very strong
There are lots of bonds in the giant lattice
Lots of energy is required to break all the bonds
Why does graphite conduct electricity?
Because the inside the layers the delocalised electrons can move freely.
Silicon Dioxide structure:
Tetrahedral shape
Strong grid like arrangement
Similar properties to diamond
