Chemistry OCR (A) F321 Revision 2 of 4

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05/12/2011
Lesson
4
Reac0ons
of
Group
2
metals
Objec0ves
· Describe
the
reac0ons
of
group
two
metals
· Write
half
equa0ons
for
the
reac0on
of
group
2
metals
with
oxygen
and
water
· Describe
the
reac0ons
of
group
two
metal
oxides
· Describe
the
reac0ons
of
group
two
metal
hydroxides
1

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Page 2

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Reac%vity
of
group
2
elements
Group
2
elements
are
strong
REDUCING
agents
When
they
react
they
are
OXIDISED
OIL
­
RIG
M
M2+
+
2e-
Predict
the
trend
in
reac0vity
going
down
the
group
Reac%on
with
oxygen
2Ca(s)
+
O2(g)
2CaO(s)
What
are
the
oxida0on
numbers
for
each
element
before
and
aUer
the
reac0ons?
2…read more

Page 3

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Reac%on
with
water
Ca(s)
+
2H2O(l)
Ca(OH)2
(s)
+H2(g)
What
are
the
oxida0on
numbers
for
each
element
before
and
aUer
the
reac0ons?
Group
2
oxides
and
hydroxides
are
bases
and
neutralise
acids.…read more

Page 4

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AfL
When
you
dissolve
MgO
in
water
it
has
a
high
pH.
Explain
why
this
is?
Answer
To
have
a
high
pH
there
must
be
hydroxide
ions
present.…read more

Page 5

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Past
paper
ques0on
Past
paper
ques0on
5…read more

Page 6

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paper
ques0on
Past
paper
ques0on
6…read more

Page 7

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Mark
scheme
Group
2
carbonates
Thermal
decomposi0on
by
heat
­
more
difficult
going
down
the
group
MgCO3(s)
MgO
(s)
+
CO2
(g)
In
other
words
THERMAL
STABILITY
increases
as
you
go
down
the
group.…read more

Page 8

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Past
paper
ques0on
Past
paper
ques0on
8…read more

Page 9

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Mark
scheme
Past
paper
ques0on
9…read more

Page 10

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Mark
scheme
How
to
write
"half-equa0ons"
A
half
equa0on
shows
the
reagent
being
oxidised
OR
the
reagent
being
reduced
separately.…read more

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