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Page 1

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02/01/2012





Bonding,
structure
and
trends

(periodicity)

Bonding
and
structure
revision





Objec
· 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 (MP,
BP,

conduc etc
based
on…

Page 2

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02/01/2012





Defini -
LEARN

Ionic
bonding

· Electrosta interac 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

Page 3

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02/01/2012





Past
paper
ques




Mark
scheme





3

Page 4

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02/01/2012





Mark
scheme





4

Page 5

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02/01/2012





Dot
and
cross
diagrams
-
COVALENT

Remember

· Show
sharing

· Overlap
or
touch
circles

· Show
outer
electrons
­
easy
to
forget
for

halogens





5

Page 6

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02/01/2012





Mark
scheme





6

Page 7

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02/01/2012





Mark
scheme





Da covalent
bonds

· Both
shared
electrons
come
from
one
atom

· Show
as
two
dots
or
two
crosses
together

· Key
example
is
the
ammonium
ion






7

Page 8

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02/01/2012





Mark
scheme





8

Page 9

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02/01/2012





Metallic
bonding

Defini Electrosta aarac between

metal
ca and
delocalised
electrons



Structure
is
giant
metallic







9

Page 10

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02/01/2012





Mark
scheme





Shapes
of
molecules

· Electron
pairs
repel
ensuring
bonds
are
as
far

away
from
each
other
as
possible.


· Lone
pairs
repel
more
then
bonding
pairs



· To
determine
shape/bond
angle
decide
how

many
bonding
pairs
and
how
many
lone
pairs

there
are






10

Comments

banerjee

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

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