Structure And Bonding II

Revision notes on structure and bonding for AS Chemistry.

HideShow resource information
  • Created by: Anonymous
  • Created on: 10-01-08 14:02
Preview of Structure And Bonding II

First 185 words of the document:

Katie Overington
Structure and Bonding II
Covalent bond: shared pair of electrons from each donor atom
Double covalent bond: 2pairs of electron are shared e.g. CO2
Triple covalent bond: 3 pairs of electrons are shared e.g. N2
Cl2 SO2 N2
Expanded octet
Dative covalent bond: shared pair of electrons both from one donor atom e.g.
Diamond and graphite ­ Allotropes of carbon
Diamond Graphite
Each carbon atom is linked to 4 other Giant covalent structure, atoms held
atoms in a giant covalent structure together in extended sheets of atoms ­
Does conduct heat though quantum but Does conduct heat and electricity as
not electricity delocalised electrons move along
Very strong covalent bonds ­ hard Great tensile strength but soft to touch
and weak van de waal forces
Used in jewellery and abrasives Used in pencil and to make crucibles
for casting metals.
Sigma bonds:
S Orbital P orbital
1. S + S e.g. hydrogen
2. S + P e.g. HCl

Other pages in this set

Page 2

Preview of page 2

Here's a taster:

Katie Overington
3. P + P e.g. CC
Pi bond:
Shapes of covalent molecules:
Rule 1:
VSEPR Valence Shell Electron Pair Repulsion Theory:
The shape of a molecule or ion is caused by repulsion between the bond pairs of
electron and lone pair of electrons that surround the central atom.
Method for predicting the shape:
1. Count the number of sigma pairs on central atom
2. Count the number of lone pairs on central atom
3.…read more

Page 3

Preview of page 3

Here's a taster:

Katie Overington
Properties of covalent substances:
Electricity conductivity: V. poor as no free electrons
Solubility in water: not soluble unless strong polar bonds e.g.…read more


No comments have yet been made

Similar Chemistry resources:

See all Chemistry resources »See all resources »