Transcript click - ChemSheets

AS 019
09-Jul-12
IONIC e.g. NaCl
+
–
–
–
+
+
–
+
+
–
+
–
SIMPLE MOLECULAR e.g. CH4
SIMPLE MOLECULAR e.g. I2
Melting &
boiling
points
PROPERTY
EXPLANATION
LOW
Weak forces
between molecules
Electrical
DOES NOT CONDUCT
conductivity
Strength
BRITTLE
Solubility in
water
SLIGHTLY SOLUBLE
No mobile charged
particles
Weak forces
between molecules
SIMPLE MOLECULAR e.g. ice
GIANT COVALENT e.g. diamond
http://www.edinformatics.com/interactive_molecules/diamond.htm
Great rotatable structures (but they are NOT molecules!!)
Melting &
boiling
points
PROPERTY
EXPLANATION
VERY HIGH
Need to break all
strong covalent
bonds
Electrical
DOES NOT CONDUCT
conductivity
Strength
STRONG
Solubility in
water
INSOLUBLE
No mobile charged
particles
Rigid arrangement
of atoms held by
covalent bonds
GIANT COVALENT e.g. graphite
http://www.edinformatics.com/interactive_molecules/diamond.htm
Great rotatable structures (but they are NOT molecules!!)
PROPERTY
EXPLANATION
VERY HIGH
Need to break all
strong covalent
bonds
CONDUCTS
Some electrons free
to move between
layers
Strength
BRITTLE
Weak forces
between layers so
layers can slide
Solubility in
water
INSOLUBLE
Melting &
boiling
points
Electrical
conductivity
METALLIC e.g. Mg
PROPERTY
EXPLANATION
HIGH
Strong attraction
between +ve ions
and delocalised e-’s
CONDUCTS
Outer shell
electrons free to
move
Strength
STRONG
Layers can slide
while maintaining
metallic bonding
Solubility in
water
INSOLUBLE
Melting &
boiling
points
Electrical
conductivity