R-AECHE-21
Table of Contents
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VSEPR:
The four pairs of electrons around a central atom repel each other.
Pairs of electron arrange themselves so they are as far apart as possible.
The repulsion between lone pairs is greater than the repulsion between bonding pairs.''
Allotropes of Carbon
:
Carbon forms networks of covalent bonds.
The manner in which these networks forms can affect physical properties.
e.g. Diamond vs Graphite
Diamond:
Chemical symbol: $C_{(s)}$
Bonding: Covalent
Structure: Molecular network (atoms bonded together)
Shape: Tetrahedral, bond angle 109.5 degrees
Conductivity: Very weak, no charged particles (no lone pairs, all electrons are bonded in a shared pair of electrons)
Graphite:
Chemical symbol: $C_{(s)}$
Bonding: Covalent
Structure: Molecular network (atoms bonded together)
==Carbon only bonds with
3
carbons, and a delocalised electron is produced.==
Shape: Triangular planar, bond angle 120 degrees, ==layers==
These layers attract each other via
weak
electrostatic forces of attraction, known as
weak dispersion forces
.
Conductivity: Slightly conductive, there is a mobile charged particle.
