Chemistry OCR (A) F321 Revision 1 of 4

Bonding, structure and shapes

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02/01/2012
Bonding,
structure
and
trends
(periodicity)
Bonding
and
structure
revision
Objec<ves
· Draw
and
interpret
dot
and
cross
diagrams
· Use
VSEPR
to
predict
the
shapes
of
molecules
· Describe
covalent,
ionic
and
metallic
bonding
· Describe
structures
of
substances
· Explain
physical
proper<es
(MP,
BP,
conduc<vity
etc
based
on
structure
and
intermolecular
forces).
· Describe
trends
in
physical
proper<es
1

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Defini<ons
-
LEARN
Ionic
bonding
· Electrosta<c
interac<on
between
oppositely
charged
ions
Covalent
bonding
· A
bond
between
two
atoms
involving
a
shared
pair
of
electrons
Dot
and
cross
diagrams
-
IONIC
Remember:
· Square
brackets
· Charges
· Transferred
electron(s)
· Balanced
· DO
NOT
show
sharing
2…read more

Page 3

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Past
paper
ques<on
Mark
scheme
3…read more

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scheme
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Dot
and
cross
diagrams
-
COVALENT
Remember
· Show
sharing
· Overlap
or
touch
circles
· Show
outer
electrons
­
easy
to
forget
for
halogens
5…read more

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Mark
scheme
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Page 7

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Mark
scheme
Da<ve
covalent
bonds
· Both
shared
electrons
come
from
one
atom
· Show
as
two
dots
or
two
crosses
together
· Key
example
is
the
ammonium
ion
7…read more

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Mark
scheme
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Page 9

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Metallic
bonding
Defini<on:
Electrosta<c
aarac<on
between
metal
ca<ons
and
delocalised
electrons
Structure
is
giant
metallic
9…read more

Page 10

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Mark
scheme
Shapes
of
molecules
· Electron
pairs
repel
ensuring
bonds
are
as
far
away
from
each
other
as
possible.…read more

Comments

banerjee

This is very well set out and very helpful. Thank you

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