Class notes
Chemical bonding & Molecular structure
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Lecture notes and summary of the work covered in weeks 8 - 10
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Chemical Bonding 8 Molecular structureDNLBFN003
, ewis dot structure Net energy transfer =/c- + EH
7?
I: :?
& -4
'
PES OF BONDING
onic bonding .
Hard -
doesn't bend
- 2 atoms with a
large difference in Electro negatiuities (a metal r a non -
metal )
-
Brittle
-
transfer of electrons from metal to non -
metal
-
Rigid cracks without
typically soluble in water
-
covalent
•
2 non -
metals with a low difference in electronegativity (SEN)
•
Sharing of electrons
Metal ic
•
2 metals electron
pooling with metal cores in a sea of delocalised electrons (é )
Couomb's Law
"
-
= 9%2 E = Fxr
"
.
-
.
- =
492 1<=9,09×109 Ii?m
Lattice Energy
change required ionic solid into gaseous ions
energy to 1 moi ol
•
its
separate
can't use coulomb's law to predict Hess 's Law
-
-
. . use
L
tess 's to calculate Lattice
aw
Energy
1h of an for the individual reactions that make it up
overall reaction is the or the
enthalpy changes
-
sum
enthalpy in chemical reaction is in dependant between the initial and final states
a of the
pathway
'
.
Born Haber cycle -
-
the sum of Sh = net 1h
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