Download - OLevel Chempractical 02-11 ANS
-
8/10/2019 OLevel Chempractical 02-11 ANS
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NAME:
{)
DATE:
ASSESSMENT
FOR
TOPIC:
..ENERGY
CHANGES,
Section
A
Multiple
choice
questions
't.
Whicfr
of
the
followingidoes-lat
release
heat energy?
A.
The
mixing
netwdb-n-Oilute
hydrochloric
acid
and
sodium
chloride
solution
B-
The
mixing
between
dihlte
sulphuric
acid
and
water
C,"
The
reaction
between
hydrogen
and
oxygen
to
form
vvater
,76.
me splitting
of
hydrogen
mclecules
into hydrogen
atoms
2-
The
three
equations
are
given
below'
l:
H,
*29
ll:
HCI*H
+ Cl
lll:2H+O*H,O
Which
oI
the
above
equations
represent(s)
endothermic?
A.,
lonlY
,,9.
land
ll
C.
lland
lll
D.
l,ll
and
lll
5,
The following
chemical
reaction
takes
place.
NHJg)
+ HCI(g)
-
NH.CI{s} AH
=
negative
value
Vqfr6n satement
about
the reacticn
is
correct?
,A.
The reaction
causes an
increase in temperature in
the sunoundings.
'/
B.
The reaction
causes
a decrease
in the
temperature
in
the sunoundings-
C. The
reaction
is a bond
breaking
process-
D.
The reaction
is a
physicalchange.
6. Which
of the
following
statements
is
true about an
endothermic
process?
A.
A catalysi
is required
to
initial the
chemical
reaction.
B. Ught
energy
is always absorbed
in the
process-
C.lt
does
not
require an activation
energy to
initiate
the reaction-
/
tne
tatal
energy
content
of
the
producrs is more than
that
of
the
reactants.
t'
7. Which of the
following
descriptions does
not
correctly
describes
an
exothermic
process?
A.
lt is a
bond making
process-
g.
Thetemperafurerndrescnrauadicgshcreeses.
. ,
9. .
total energy content of the
products
is
less than that of the
ptftkcts.
i
-t,
{'tr*l-
.,D-
The
process
does
not
involve
actirration
energy.
,u
(F)
3.
A reaction
between
magnesium
and
dilute
hydrochloric
acid
according
to
fte following
equation'
Mg(s)
+
zHC(aq)
*
Mgc[(aq]
+
H"(g]
AH
=
negative
value
Which
of
the
following
statements
is incorect?
(t)
A-
Magnesium
is oxidised.
B.
Magnesium
ctrloride
has
a high
solubili$
in water'
d
md
1611p1I energy
conter*
ot
tfre n1gCt"
and
H"
is
greater
than
that
of
Mg and
HCI-
'';.
Every
1
mote
oi
magnesium reacts in an excess of
acid
produces 1 mole
of
magnesium
chloride-
4. When
solid
sodium
chloride
is
added
to water,
the
temperature
of
the
water drops-
Which
of
the
folowing
conclusions
best
describes
this observation?
,7*.
tniprocess
is endothermic.
(
Il
)
'
B.
The
process
is
exothermic.
C-
Sodium
chloride
reacts
with
water.
D. lt
is a
bond
forming
Process.
(i)
(>)
{p}
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8.
The
chemical
equations
forthree
changes
are shown
belorry:
CO""..-.-
C +
20
2H'+
O-
ZILA
NH.CI*
NH.'+
Cl
1- Natural
gas
contains
mainly
methane
gas,
GH*
When
metfiane
gas
buns
completely
in
an excess
of
oxygen
gas,
carbon
dioxide
and steam
are
produced.
8Sn
kJ
of
heat
is
given
out
for enrery
mole of
methane
bumt.
CH.(S) +
O,(g)
-+
CO"tg) +
H"O(S)
(a)
Write
the
heat
of
reaction
for
the
rmction.
^H=
-
E'lohJ
(b)
calculale
the heat
eneEy
released
when
o.4g
g
of
methane
is
bumed.
No
rS
-"1
u
J+f
:
ct-(,",Jc' ryul
t,
't
mul
,tr
Ctiq
,
,t
,tk^*,
tJoKJ
,'*'j'1
-
A,tt)lnd/,J
trtU,
it
tt,t
,'p.L-i,.tn-
tt;;')c''1
3'lr'=
A/kl
4
(c)
ls the
reaction
an
6ixothermic
or
an endothermic?
Explain
in
terms
of
bond
breaking
and bond
making.
l:
II:
l[:
Which
of the
ctrange(s)
islare
endothermic?
Arl
,9.
I, Ht
u
c.
lr,lll
D. I,
il,
[l
9-
Fuels
are
substance
uvnjch
give-olf
large
amount
of heat when
hrmt
Whicfr
of
the followirg
statemenb
is nottrue
aboutfuels?
A- The
products
formed fom
the
combustion
of fuels
have a
lorer
energy
content
than
ffi of
fuels-
&
The
bonds
which
are broken
are
weaker
than
the
bonds that
formed
after trre
cornh.stfrrn-
km3:ffitrffiffi#ffi??**pr*e*
t
10'
When
1
g
of
methane gas
is
hrmt
comptrstely,
56
kJ
of energy
is released.
tAfhat
will
be the
amqnt
of
heat
released
if
i
mole
of the
gas
is
hrmt
completely?
A.
56 kl/mol
B-,,1O2
kllmot
il agakJ/rnol /
,,/o.
8960o
kl/mot
c
5
(d)
Draw
energy
profile
for
reaction-
b'n rl-'
ffA'.t.'h'*,
'a*ry
-
[1,kJ
ft*f",',f
*,**
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8/10/2019 OLevel Chempractical 02-11 ANS
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I
lrsrvl,vtt
q. u
v
rvetr
rBvr w9 r9r
ru rvrrr.
orsqrrr
qwvru[aY
rv r9
gt{ucuvtr
usluvl-
-'t
:-:/_H2..;)
+
-o2(,)
*.tHzo(
,)
aH=-484kJ
(a)
Balance
the cfremicalibquation.
;
(b)
Complete
the
state
symbols
in the equation-
(c)
Describe
the energy
content of
the reactants
and
the
product.
\(-
i-
/
,.,
i-
.'
.1's,
:,1
;1,-ii11 1;;i.t
)
rnlJu'\
(d)
The energy
released
in
bondtdis
1368 kJ.
Determinethe
energy
involved in bond
making
ior 0.5 mol water
molecules.
't1tI
Li
i
L
'i
'*:-i
,\
I
L1:'
/
i
+'t-'
. ,'.}
,,
-
-LtF
?
'?l
1{"
'
: i::
I t''. i
't'
t(-
,,a.
'
-
a,v
tl
"'',
i
..1
I
g.
The
following
information
shows
the heat
of reactign
for different
readions.
;
,
,_.r:
_
,
"
_,
1
FleactionA:
CHo
+ 3Cl.
.*
cH,cl
+ SHCI
LH='327dJ
*
7
-
'a''*
,
-1*,x.i
Reaction
B:
2NaoH
+ H,So.
.*
Na"So,
+ 214,0
aH
=
-114
kJ
'':':
f
Reaction
C:
N,
+
O,
-
2NO(g) AH =
+181
kI
Draw the energy
level diagram,
lFFtt@EP7i'MP+innnQtgy,
for
the lhree
reactions-
r
a)
i
iir'
i,
a
Jl
d,
1---
ii
I
I
{b)
Determine
the aniount
bf
energy
absorbed
when
0.84
g
of
nitrogen
gas
reacted.
\i, r'i l:t,;u, . ;"/. :---;i.-: - .. ''t'
,
I
i
/'
)
I::
,,.-".:; i.,.i.
-.:\':,r'...:ii
'"/',
'"L'j
':
r'-lIi
i.
.'....
,.'
|
--..'-.."
'
t
4. Methane
reacts
with chlorine
gas
according to the following equation:
cHJg)
4cL(s)-ccL($
+ aHCr(s)
Given
the bond energies
ol
the
covatent bonds invofued:
[H
-
CI: 41 2
kjlmol;
C
-
H:
431
kJ/mol; C
-
CI' 338 kJlmol; Cl-
Cl:
242
kJlmoll
(a)
Name the number
and
the
type of bond-forming
in this reaction.
(b)
(c)
Determine the AH for
this
reaction- . ,
,
f^.t
:-....,..
i..,
i
yr
:
)
i:' ':
j
-f
i-i,''rll:
''
-
".,i-
x{-
J(
.i
,
-
>,-li.r++i-f--+1
i
\.-*-J,
i
i
L"
.'..1
+l>
--
-"
'
-
'ij'7
)
:
lr
:
i-.-/t
\
r
-'-i--
J'
r
ls
this reaction
an exothermic or an endothermh?
{;}r
l;"-
i;tltL..
t'.i...('l;,
,l
-f.
r-j
):
-t:'
,
t:. 1
'l
tl'-;
:
"-
'
i,,' i
t,
, i-"
i;rl
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Section
C
Free tspottse
questions
::-
::
],:.,.:.:
i:.
:,
1.
Hydrogen
and
chlorine
react
to brm
trydrogen
cfiloride-
1U
kl
of
heat
energy is released from
anery
1 mole
of trydrogen
and
1
mde
of chlorine
reac.td.
{a)
Write
a balarrced
cfremical
equation, include
the
heat
of
reaction
(AH),
for
fte
reacfion.
{b} {D
What type
of
energy
change
takes
plae
when
bon&
are broken?
(ii)
VYhat
t rye
of energy
change
takes
place
rrhen
bonds
are
lormed?
tii0
Whi,ch
is the larger
energy
cfrange
taking
place,
bond breaking or
bond making, forthe abore
reaction?
Explain
lour
ansrrer.
(c)
Drawthe
ener,y
profib
forile
abole reaction.
{d}
Determine
the
energy
change
when
21-3
g
of drlorine
g:as
reacts eompletely witrr trydrogen.
lat
fr,
r
U)
--+
2qCL
^tl--
-t?vkJ
(h)
U
)
ndo't[ut'nrc
(
il)
'vul'ktmrt'
(
ii,)
Bon,t'
nil'l"r'
7l'-
e*r*
t""k"*L
A'-u4
L*d
-
n^W'
",*ry
llr,"us
,"yo
6mr-
6*,*
(
L)
(d)
N,
,1
*''1
ft*
*1
[^,1
,
O'30 rnol
fTt
"f
'e^c'he"rL
rt
-
]q'30-36rnol
ur>=
7
n
e
1,
ret{4t
/
lt'(-
F1
'-*ff
"
i"L'vd
'
")
(.),
u),il
,e\"ry
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NAME:
()
DATE:
ASSESSMENT
FOR TOPIC:
"REDOX
REACTIONS"
1.
Define
the
following
in
terms
of
electron
loss
or
gain:
(a)
oxidisingagetrt;
-
fr
).u:;?ryx-
4.- .t",i;i;s-'t
t':"nafi^21
-twb;;t,4--' -:'
./,',t'"
ll*-.r':iri'1''
(b)substanceoxidised.-
+
gql2S 7aq,
"^*t
h,'o
,i*l
suc*z'ts
A)
i,
,,
fr
,rqhJ
)
l
2.
Aqueous
hydrogen
peroxide,
HzOz, reacts
with acidified aqueous
potassium
manganate(Vll)
as
follows:
SEzAz(aq)+
2MnOa-
(aq)
+
6H*
(aq)
+ 5O2
(aq)
*
ZMnz*
(aq)
+
SHrO
(l)
(a)
State
the colour
change
you
would see when
potassium
manganate(Vll)
reacts
with
hydrogen
peroxide.
,r4',,",y
o.
),
:.:,-
1L;,.;
(1)
v
(b)
Name
the
acid
usually
usedto
acidiff the
potassium
manganate(Vll;.
"'
.',,,'"--"
/(t)
I
(c)
Based
oo
your
understanding
of
oxidation
numbers, state
and explain
which
substance
hasbeenoxidisedinthisreaction..),.,'..,i
--,,r1
,t'-.-i
\
iftt:.r rr.i,...,(2)
; ... l'
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4(a)
In
each
of
the
following
equations,
give
the
formula
of
the
substance
that
is being
oxidised-
Give
a reason
in
each
case foryour
choice.
(i)4NH3+3o2+2Nz+6Hzo
\ri:'
i
c
5'J
lti
"rc'
ret,t,"4
I
.ri-i
a-:;ry;JiriZ"i*
*v
l_.
rz
Iz(g)+2NaoH(aq))NaCl(aq)+Nuc{of"qlriirofli
J,,,4
lb()
(i)
GivetheoxidationnumberofchrorineinNacr.andNacro.
(1)
2
-lt
(ii)
Sodium
hypochlorite
solution,
(Naclo)
is
an
oxid/sing
agent.
Describe
a
test
for
an
oxidislng
agenl
.,rr,
i
'
e)
i
{-'
,,
I
A
*t
t'("r-]
"-'r
I
'
L-1
:c)
I
I
,-t:rl
d
Ll)z-.
a^,ler;*
l-t
t,
,tr
U*
ct[c*k,
wl,-t;in
1 ]'r't
"
,l*'r,
d",rt
[cb,Q-;s
l-
tl"t,vve'L
/l-
ftw
r,a/h*
,)
^l,n
(
r('
#vn
ltz-
fviy,,
",''
;";Jrr',1
-
8/10/2019 OLevel Chempractical 02-11 ANS
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{a)
Gomplete the following-
{0
oxidarionisthetoss
a
hild,.tY'l
orrn
of orygen.
Ll
t
e+
{ii)
Reductionisthelossof
-0,W-ar*e
3N4
ot
hf"rya
d'5
+
(b)
For
each of the following
reactiong
underline
the substance
being oxidised
and
state the reason.
ti)
Zn
O"
+ 3CO
*
2Zn +
3CO,
CC
iar*rrn',
+)
{ii)
Mg
+
H.SO.
*
MgSOo
+
H,
cno.ttr*-
trt
0
5.
(a)
A
reaction is shown
below-
2NH" + 3Cu0-N, +
3Cu
+ HrO
ldeniify
/1
(D
oiioising
auent
L
r't
L'
tatw:
{ii)
Reducing
agent
Alltt {
la,w
-
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NAME:
()
DATE:
ASSESSMENT
FOR
TOPIC:,,QUALITATIVE
ANALYSIS,,
Section
A
Multiple
choice
questions
.t.
Which
of
the
following
substances
forms
a
colourless
solution
which
reacts
wilh
acidified
aqueous
lead{ll}
nitrate
to
give
a
yellow
precipitate?
A-
Sodium
nitrate
8., Copper(ll)
sulPhate
Z Potassium
iodide
-
D. Calcium
nitrate
2.
A
metallic
ion
in aqueous
has the
following
characteristics:
l:
Forms
a
white
precipitiate
with
NaoH(aq)
and
is
soluble
in excess
NaOH(aq)
ll: Forms
a
white
precipitate
with
NH.(aq) and
is
soluble
in excess
NHJaq)
Wltich
of
the
following
ions
best
fiis lhese
characteristics?
-,{
zn*
B. Ca*
c. Pbz-
D.
AI*
C
c)
({\
3.
Two aqueous
solutions,
P and Q,
are
mixed together.
Which of
the
following
pairs
willnotfroduce
a
whjte
precipitate?
7Po.\
A.
Sodium
hydroxide
Calcium
nitrate
/ D )
B-
Situer nitrate
Barium chloride
[
/
/
C.
Zinc
nitrate
Sodium
hYdroxide
-F.
"'Sodium
iodide
Lead(ll)
nitrate
4. The
following shows
a series
of
reactions.
('fl
)
C.
Calcium
sulphate
D.
Lead(ll) chloride
S.
Dilute
sulphuric
acid
was added
to
a
testtube containing
unknown
powderThe
reaction
produced
a
gas
which iurned
limewatercloudy.
Afterthe reaction
has stopped,
excess
aqueous
sodium
hydroxide
was added
to the test tube.
A dirty
green precipitate
formed.
What
could
be the
unknown
powder?
A. lron(lll)
nitrate
B. Copper(ll)
sulphate
,,e.
rcn$l)
carbonate
/'
D.
Lead(ll)
chloride
(c
)
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6.
An
aqueous
solution
ol an
unknown
salt
produces
the
following
observations
when
added
to
the
reagenhs.
Reagent
Observation
Aqueous
sodium
hYdroxide
Reddish
brown
gelatinous
precipitate
tormed
Dilute nitric
acid
fotlowed
by
aqueous
silver
nitrate
solution
VVhite
precipitate formed
Which
of the
following
is
ifie unknown
salt?
A.
Copper(ll)
sulphate
B.
Lead{ll}
iodide
C. Calcium
sulphate
y'
lron{lll}chloride
T.
Which
of
the
following
reagents
is best
used
to identify
sulphuric
acid
from other
types
of acids?
A.-filver
nitrate
.6- Barium nitrate
-'c
Sobium
hydroxide
D.
Magnesium
carbonate
'r1lflmc:'irt*{t
A.
NO;
B.
co"o
'-,7
rd
Na;
'
D.
so.*
g.
when
aqueor,
,rn*or@rhbride
was
heated
gently with-aqueousY
a
gas
was
produced
which
turned
the
red
litmus
p#er
blue-
which
is most
likely
the
ion
present
in Y?
tirlg*
+
cll-
-+
r\il3
r
l)c
U,
.
74'*'
(C"t
1
ll>C
)-
Two unlabelled
bottles
are
placed on
ataHe-
One
bottle
is
known
to contain
aqueous
soditjm
iodide
and
the other
aqueous
sodium
chtoride-
Whicft
test
would
identify
the
solutions?
tK
adained
lead(ll)
nitrate
/
g.
Acidified
silver
nitrate
C.
Acidified
Potassium
nitrate
D
Aqueous
sodium
hYdroxide
10.
\JVhich
of
the
folloring
results
is most
likely
to be
seen
when
aqueous
ammonia
is added
in
eD
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8/10/2019 OLevel Chempractical 02-11 ANS
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2- Complete
the
following
table.
Formula
ol
ion
Observation
when a few
drops
l{a0H{aq) is added
Qbservation
when
excess
NaOH(aq)
is
added
L'ct
white
precipitate
white
precipitate
remained
Fe*
v-{1,1,,,h -
$,v,v1t
y*r, yl,
I
u
r
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8/10/2019 OLevel Chempractical 02-11 ANS
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Section
C
Free
reponse
questions
1.
When
a mmpound
p
dissolves
in water,
it
gives
clear
blue
colour.
,when
aqueous
sodium
hydroxide
is
added
to
p,
a
brue
precipitate
e
is
formed_
when
F
is
actded
to
agueous
sodium
hydroxde
followed
by
powdered
aluminium,
it
releases
a
gas
R
pon
gen{e
heating-
Gas
R
turns
damp
litrnus paper
blue.
when
precipita{e
Q
is
afied
to
a dilute
acid
s,-a
Hue
solution
T is
produced-
lrvhen
solution
T is
added to
acidifed
barium ni&ate sorution, a
white
precipitate
v
s
il*"d.
(a)
Deduce
the
identities
of
p,
e,
R,
S,
T
and
V.
(b)
Write
a
chemicat
equation
fior
the
brmalion
of
V.
2-
The
diagrams
betow
shoru
a
serie
of
reae{ions.
(a)
ldentifyL,
M,
N,
pande.
lbl
.ryrF
a
cfremicatequation
forthe
reaction
between
L and
NaOH(aq).
(c)
write
a
chemiral
equation
{or
the
redrrction of N
by
carbon
*ono":il.
(
b
)
EnNAc\,
(1,
c^9%
Lry
4
BnbD4o
u
t
\
d
Lon
(tt)
x$a4e-
(
t
|LL(N
o*
t3)
h)L
tl
:
N'I
Jan(t
) le/ny',k-
trvn
(
iv)uol;L
C
'
Yiol{tn
iron
6
'
Brudt*
sd'fule'
Element
P
which
is
the
main
component
in
making
steel
(b)
?e70rr3,
o
&N^aLl
t"Xr
A
'f,*(ot+)z
*/
+
)'lq'Sas
ult
tt)
Tuu9
t
r
ff-|---+
>f*
{
scb>
-
8/10/2019 OLevel Chempractical 02-11 ANS
12/37
()
ASSESSMETIIT
FC}RTOPIG
"ACID'
BASES
AND
SALTS'
DATE:
NAME:
Section
B
Structured
quwtions
1.
(a)
Defineacids.
t'"Ok
(b)
{c)
Sodium
hydroxide
with dilute
nitric
acid
to
produce
a salt
and
water-
Give
trree
propertie
of
acids-
(i0
Wrfie
tfe
ionic equation for
this
reacticn.
0[l'til,,t
ll'(/,,,u
2.
ta)
(ii)
(b) (il
(ii)
Suggest
a salt which can be
prepared
by
titration
method.
tlnLL
Write
the formula of
the
ion which is
produced
in aqueous
solution
of
(i)
*.dd,,+
an
alkali
For
the
salt
you
named
in
{b}{i},
suggest
the suitaHe
reactants-
t'/a
oH
rt.J
ACt
(iii)
Hor
do
you
test for the
purity
of the
salt
produced.
A
sample
of
4.00
g
of
coppe(lt)
oxide was
used
as
the
starting
material
to
prepare
oppe(ll)
sulphate
crystals
(CuSOoSHp).
A 500 cm"
of
acid
solution
is
used.
{a)
Suggest a suibtde
acid to be used in the
preparation
of the salt
5.
il
h*,,:-
,vi
Ll
(b)
To
arroid any excess of coppe(tl) oxide
or
the
acid, calculate
the concentration of
the acid
to be
usedinthereadion'
rtr)c*
"
cuc
--+
curs';4
+
liLo
NrX
il,L
I
rhDl
q
Cro
'-
2"+:L\L.d
orni.l
*,t }
llrst*
'uwt
-
8/10/2019 OLevel Chempractical 02-11 ANS
13/37
4-
(a)
Lithium
nitrate
is a
soluble
salt
which
can
be
prepared by
the
titration
method'
tii
ftfr*t
the
suitable
reactants
to
prepare
this
sali'
Acid:
Alkali:
(ii)
Explain
why
the
titration
is suitable
for
the
preparation
o{
this
salt'
(b)
Lead(ll)
sulphate
is an
insoluble
salt'
(i) Name
the
method
to
prepare
forthis
salt'
(ii)
Suggest
the
suitable
reactants
to
produce lead(ll)
suiphaie'
(iii)
Write
the
ionic
equation
{or
the
reaction'
Aqueous
sodium
hydroxide
is an alkali'
(a)
What
is
meant
bY alkali?
l, |
."
,.t
1
i,t:.'t\
':il
1',.i:'.1
:-.
:i l-
':
'
1"''
:"-
|
,,,
,i
-._
,_
r-.,;
..i
t,i"
-
--
(b)
Ethanoic
acid
reacts
with
a
calcium
t9
fiqlf
3-sai
tr-:'=
=:;-'=
*E:tz;:--suggest
the
name
of
the
salt
when
sodium
hydroxide
reacts
with
eiha::
:
:
: :
(c) Aqueous
sodium
hydroxide
is
gradually addet
::
=
-::
1
=:'::':-:
=;'
;:*
&e
soluiion
is
neutral.
(t)
Suggest
a
way
how
to
determine
if the
sa'---':'-
f
= i-=
'
:-
(ii)
Write
a balanced
chemical equaiia*
i:'-':
:=::-
:-
(d)
\t- ,-l,,.,_r
'1
t
tf,-i-
:
-
'1
Aqueous
sodium
hydroxide
is
graduaii." a::=
--.-e-
A
green
PreciPitate
Aqueous
sodium
hfdroxide
is
graduati-v a=::=:
i:
=:-=:'-:
:a:l-r-:
-'-3:u-
rl
stEv'
I
Prr
iron(ll)
hydroxide
is rormeO-
nriotner
qix--=-
-a:=*'-
'.-4:*'
*r.?r=
r:
i*e
solution'
(i)
WritL
a
balanced
chemical
equat=r':'-
:;:
:=::r-
(ii) Write
an
ionic
Suation
for
t}'r:s
===::=
Sec'tion
C
Free
response
questions
i.
potassium
chloride
can
be
prepared
from
the
reaction
between
aqueous
poiassium
hydroxide
and
an
acid.
(a)
Suggest
a suitable
acid.
':
i
--.
i
iUi
wtG
a
balanced
chemical
equation
for this
reaction'
,, .
.
icj
oescr6e
fully
how
you
would
prepare
pure potassium
chloride
crystals
from
these
starting
materials.
(d)
Writeanionicequationforthereaction-
,;l
,;.1
.
ri'-r.-.,
-'-
;...
-
:i
Dilute
silver
nitrate
solution
is slowly
added
into aqueous
hydrochloric
acid
solution'
(i)
Name
the
product
formed.
-
',":
"rri"
.
'
iiit Oescribe
tullv
how
you
woutd
obtain
the
pure
dry
product
from
the
reaction'
i"'"
Inr"o*,
,i.ri
"*;
"i
o.s
rnoyam' sooium'hydroxide
was
used
to
react
with
1.o
mol/dm'
oi
dilute
trydrochloric
acid.
(0
Writeachemicalequationforthereaction.
'""'''
t:
''
iii)
O.t"r*ine
the
volume
of
acid
that is
needed
to neutralise
the
sodium
hydroxide
completely'
2.
(a)
(b)
(c)
-
8/10/2019 OLevel Chempractical 02-11 ANS
14/37
NAME:
()
DATE:
ASSESSMFNT
FOR TOPIC:,.SALTS,,
Multiple-Choice
Questiors
1.
which
of
the
following
pairs
can
be used
to
prepare
potassium
sul{ate?
A
Potassium
and
dilute
sulfuric
acid
B
Potassium
and
aqueous
sodium
sulfate
b'-
Loornrs
potassium
hydroxide
and
dilute
sulfuric
acid
u'D
Aq.r"or*
pot*.si
r*
chloride
and
aqueous
sodium
sulfate
2.
Dilute
sulfuric
acid
was
added
to
a
salt.
There
was
a
vigorous
reaction
and
a
colourless
gas
was
evolved.
After
the
reaction
had stopped,
excess
"qi"oot
sodium
hydroxide
was
added
ro
rhe
mixrure
and
a
green
precipitate
ii iormed.'What
could
the
salt
be?
,"
,A
Iron(tr)carbonate
B
Iron{III)
carbonate
C
CopPer(tr)sulfate
D
CopPer(tr)
carbonate
3.
'Which
of
the
following
chemicals
could
be
used
to
distinguish
between
aqueous
copper(Il)
sulfate and
aqueous zinc nitrate?
'A
Sodium
hydroxide solution
,..3
Barium
nitrate
solution
A
l and
2only
C 3and4only
4. An
aqueous
solution of compound
X reacts
with
sodiurn
hydroxide
solution ro
form
a
white
precipitate,
but
it has no
reaction
with
aqueous ammonia
solution.
Vhen
silver nitrate
solution acidified
with
nitric
acid
is added
to
solution
X, a
yellow
precipitate
is formed.
Name the
salt presenr
in
solution
X.
'*K.
Calcium
iodide
C Zinc
iodide
5.
'Which
of
the
following
pairs
of
gases
changes
the
colour of
moist
red
litmus
paper?
t-)
4
B
Ammonia
solution
Silver
nitrate
solution
Z ar.d4
only
A
Ammonia and
carbon
dioide
C
Carbon
dioxide
and
chlcrine
\_".D
1,2and
3
onlY
t't',.
-
,--
|
i
..:-i
iri.l I )
B
Calcium
nitrate
D Zinc
sulfate
r-.,V
Ammonia
and
chloqine
D
Carbon
dioxide
and
hydrogen
chloride
/
+.
i*t'ti+'t
I
.
i
.(
-;1..
,.'
,
.,
t-,
\
.:
,,
l
,
-J
/
/ :l
i;i'i':
-tr' \1-
'/
',i-'J:L,',i-i,-:i-'
l\r,{;i
l
r-
.i
'''i'
r'.
'
'
I
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8/10/2019 OLevel Chempractical 02-11 ANS
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rr
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ro
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r#nl
i/t{
\1,,r,';11
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rles
3urmo11o;
3rI1
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gf,ea
uI
(e)
'9
-
8/10/2019 OLevel Chempractical 02-11 ANS
16/37
)l'lr0>
u
C>
T
,q.C
+r,,*
N,l'ffi^>
.r
0.rrE
Same
am-ount
of
hydrogen peroxide is used in
both
experiments.
tf
curye X
conesponds
to
40 cm"
of
2{tlblldfif
,
which
of the
conditions best
frts
curve Y result?
-.
A-
10cm"o@,LnoUdm"
Nrl
,
,
,,4
/',)
\
B.
1ocm'ofSmoUdm'
llot
.
d'et)
'
l)
.t
C.
100
cm' of
1
moVdm"
yl1
:
c
i
D. 4o crn,
of
4
mol,/dm"
H.,l
=
0
.t
6
3,
ln a reaction, calcium
carbonate in
a flask is
placed
on
an electronic
balance.
Dilute hydrochloric
acid is
added and
a cotton wool is
placed
at the mouth
of the flask.
The total
mass
of
the
reacting
flask
is recorded
every five
seconds.The diagram
below
shows
the
results
of the reaction.
Total mass
of
the flasklg
{il)
5101520253A
Alfihich of the following
times is the reaciion
fastest?
,4. 5s
/
g.
1os
C.
15s
D. 20s
NAME: t)
ASSESSMENT
FOR
TOPTC:
'SPEED
OF
REACTION"
Section
A
Multiple
choice
questions
1.
Two experiments were
carried out according
to
the lollowing
conditions:
DATE:
400
cm"of
2.b mofdm'HCI
+ 4o0
cm" of. 5 moildms
NaS"O"
10o cm'of
8.0 moudm" HCI + 100
cm" of
8.0 mol/dm"
Na.S,O,
Same
I is less
than ll
I is less
than ll
Same
Experiment
l:
Experiment
ll:
A.
I is taster than ll
B-
I is
slowerthan Il
C.
I
is
faster than ll
D.
-
I is
slower
than
ll
Total
volume
of oxygen
The initial speed of
sulphur formation and the
total mass
of sulphur
collected were
measured in each
experiment. Which of lhe following
resulb is
conect?
Speed of
sulphurformation
Total
mass of
sulphur collected
(e/
2.
Two
different conditions
were set up for the
decomposition
of trydrogen
peroxide
to
invesiigate
the
speed
of
reaction.
The
graph
below shows
the results of two
different
conditions
used-
curve X
curve
Y
t).e+a"{
)
n,"tfd:
30
28
26
24
22
2A
40
-
8/10/2019 OLevel Chempractical 02-11 ANS
17/37
/-- .
4.
Which of
the following
will not make
a chemical
reaction
o{Astin
A- Using
powdereO-catbium
\---
fleating
the solution
Using
big
size
magnesium
striP
Using
4 moUdm" solution
instead
of 2 moUdm"
B.
c.
uD.
,/
5.
\rrlhen an
pxcess
ol copperill)
carbonate reacts
with dilute
sulphuric
acid,
the reaction
becomes
slower
greduafiy.
lt finallY
stoPs.
Which
of the
following
reasons best
explains
why
this
happens?
A. The copper(ll)
carbonate
is
coated
with insoluble
salt.
,' /^
Bt
The
copper(ll)
carbonate
does
not
rea*
well
in
dilute
sulphuric
acid.
(
t
-r'C.
The coppe(lD
carbonate
has caused
the acid
to
be
used
up
completely.
D
The copper(ll)
carbonate
has completely
used
up in the
reaetion-
6.
Aqueous
hydrogen
peroxide
decomposes
to
yield
water
and
oxygen
according
to the
following
equation:
\
,i
FLO,
*
2H,O
+
O"
The
following two experiments
were set up to
measure the
speed
of oxygen
production
from
the
decomposition
of hydrogen
peroxide.
,
.-.,
toO cm" o(0-54nol/dm"
H,O" solution
is used
200
cm3
ql
0.1
moUdm3
H"O, solution is used
\--,
Vt/hich of
the following
graphs
best shows
the resutts obtained?
.4.
Total volume
of oxygen
B.
Total volume
of oxygen
c.
Total volume
of
orygen
D.
Total volume
of
oxygen
Experiment
l:
Experiment
ll:
/r
)
(
/1
)
-
8/10/2019 OLevel Chempractical 02-11 ANS
18/37
7.
tn*nic,yRe
"f":ti'J"lo"*"""
beins
reduced?
A.
NHuto
NHr-
--
7-
--
'
3
,
B.
NH,toNOf
-
\
-
t *-(t4 ?
c.
No,ro
NO;
=---\-.--$
-J
h
'P
-7
,
15
-,D'
t'i-i
-xs
*v
t
n5
i
>)
8. Which
of
the
following
reactions
is not
a
redox
reac'tion?
A..Ea
+
2HCl
*CaCL
+ Ha
"-6.'
ugo
+
2HCl-Mgct
+
Hro
C'
ZHBr
+
F"
'ZHF
+
8r'
D.
Cu
+
+HNO"-Cu(NO.),
+
ZH,A
+
2NO'
9.
Whicfr
of the
following
definitions
ol
reduction
is conect?
Oxygen
HYdrogen
Electrons
n.
Galning
Losing
Losing
-
B.
Losingl
Gaining
Gaining
C.
Gaining
Gaining
Losing
D.
Gaining
L""iU
Ga'
'
-
F'A
nrns
)Rh
,7'
10.
A sample
of air
is collected
from
an
industrial
are9,{cnecktor
the
eualitv;trair'
What
result
would
be
--
obtained
if the
air
is
poff
uteO
with
sulphur
dioxidf?
/
,Acidifledp"t"tlir*EctrpgqaelVry
Acidifiedpotassi/miodide
4.
c,eedbiE:9:'il'{ew'-'-''
"-'Hl,i}'##*"="
B.
Green
to
orange
'
C.
Orange
to
green
Brown
to colourless
D.
No
change
Colourless
to brown
Section
B Structured
questions
1.
Equal
lengths
of
zinc
ribbon
were
added
to 2
moUdm"
nitric
acid
and
to
2
moydm"
of
sulphuric acid'
Wiren
the-reactions
has
stopped,
zinc
ribbon
still
can
be seen
in the
solution'
(a) Write
a
balanced
chemical
equation
torthe
reaction'
(r1
* lft?t,/
'*'
(,::.*-:)
(b)
ln whicfr
reaction
woutd
you
expect
the
speed
is laster
at
the
start?
Explain
your
answer'
,'i.
'L
r\
t
,,;r-
,,",*t
How
would
You
increase
the
acids?
of
the reaction
without
changing
the
concentration
ol
the
ll,,'.'i
':t,i'rtr,'t
,i"4/
Explain,
in terms
of
the
collision
theory
6ow
the
factor
you
named
in
(cxi)
can
make
the
7;,Ll
t-r
,1'
,
r
,l
(c)
(i)
(ii)
reflction
to
go
iasler?
l;1,_sfuL'.',r
i
lr,,,l-
t
'L
/
,.;f "u
,u;l
fu
i,u
I
,/ -iAt{'
.,,
a
fivs
i
LJlu:t
',
,l-
1
I
t
.'.
-r'. .n'u
t:*i,4
.r'- i{i-6
/i
;a-''Jt#
).\
,
,,.
, , t,
I
\l
L -
,j
(xL'l
I
I
-
8/10/2019 OLevel Chempractical 02-11 ANS
19/37
Z. Sulphur
can be
made by
the
reaction behveen
hydrochloric
acid
and
sodium
thiosulphate
as
shown
in
the following
reaction:
zHCl{aq)
+
Na"S"O.(aq}
*
2NaCl(aq)
+
SO,{aq)
+ S(s)
(a)
State
two
ways to
increase
the speed of
the reaction-
hrri
lK-
itf r^fi.
vt
I i,ttrt_t,N-
Lrrr*
L
(b)
In this
eperiment,
1O0 cm3
of 0.5 moUdm'hydrochloric
acid
is added
to 1O0 cm"
of
0.5
moUdm"
sodium
thiosulphate.
Explain why
the
reaction stops.
l|Lt
i
t
&"
*)
iL
hul
, vYp
i
r'vb
{irvt,
9'olwhc,u3
How
would
you
test for the
presence
of
sulphur dioxide?
An experiment
is
set
up as
follows to measure
the speed
ol
reaction
between
coppe(ll)
carbonate
and dilute hydrochloric acid.
cotton wool
reaciing
mixture
balance
Write a balanced chemical eguation
lor
ihe
reaction.
i"tJ-i.,
-f
>,1/
i
4
lt^tl,
t
([.
r
The cotton wool is
placed
at
the mouth
of the flask
to
prevent
any spillage
from
the content
of the
flask.What is
the objective
for
doing
so?
O
/i)'tjvYryf I
ad LLL[',,ji./
nti
rilliLt
-
/
(a)
(b)
{c)
The
results
of the investigating are shown below.
Plot a graph
of
loss
in
the
reacting mass against time on the axes provided.
From
the
graph,
suggest the mass loss one minute
afterthe
reaction.
(0
(i0
Time/min
2
3
4
5
b 7
Loss
in
mass/g
0.20
0_30
0.35
0.38
o.40 0.40
when the reaction has stopped.
-
8/10/2019 OLevel Chempractical 02-11 ANS
20/37
'
('\)fll
lt)
I
/
(i')
,
I
I
j
'
tl
I
t-
(iv)
Sketch the curve on the same
graph you
would
expect to obtain
if
$wdered
coppe(ll)
carbonate is used instead of
lump
coppe(|}) carbonate.
(d)
Suggest
two
other
ways, besides using
lump
copper(ll) cadlonate, to decrease the speed of this
-
-i';,*1".,
.
-
8/10/2019 OLevel Chempractical 02-11 ANS
21/37
NAME:
()
ASSESSMENT
FOR
TOPIC: "ORGANIC
CHEMISTRY"
Multiple-Choice
Questions
1.
W'hich
of
the
following
statements
about
alkanes
is
truel
A
Some
alkanes
contain
a
double
bond.
B;
Some
alkanes
are
more
reactive
than
alkenes.
,;tC
All
alkanes
are
saturated
hydrocarbons-
D
All
alkanes
have
the
same
physical
properties-
2.
When
the hy&ocarbon
C.H*
is added
to
aqueous
bromine,
there
is
no
colour
change
the
colour
changes
from
colourless
to
brown
the
colour
changes
from
brown
to
colourless
a
white
precipitate
is
formed
3.
Ethene
and ethane
are
both
trnsaturated
hy&ocarbons
react with steam
to
give
ethanol
contain the
same
number
of
hydrogen
atoms
burn
in
excess
oxygen to form
carbon
dioxide
process
by
which
ethene
and
hydrogen
are
(c>
A
Br.
trE
"D
A
B
C
E.
V
4.
The
(c)
(D)
obtained
from
petroleum
is
called
(B)
racking
&actional distillation
hydrogenation
substitution
reaction
5.
A
vegetable
oil
is described
as
polyunsaturated.
Which
statement
about
this
vegetable
oil
is
correct?
u)
It
produces
margarine
when it
reacts
with
steam in
the
preseoce of nickel
catalyst.
Structured
Questions
6.
{a)
Identify the
following
hydrocarbons:
(i)
crH.
[.f"*''*
(ii)
CrU.
3'uyu''
-
8/10/2019 OLevel Chempractical 02-11 ANS
22/37
7.
{a}
Therearethreeisomersofcnr\.Drawtheirsrructnres.
(3marks)
(b)
Under
suitable
conditions,
bydrocarbon
X reacts
with
srcam
to form
ethaaol.
(i)
Write
the strucnrral
formula
of
X and
ideotify
X.
{ii)
State
the suitable
conditions
for
this
reacrion.
(c)
The relative
molecular
mass
of
an
ursaturated
hy&ocarbon,
Y, is
54. It
is
found
that
13-5
g
of
Yrequired
0.5
mol
of
bromine
for
complete
reacrion.
(i)
Hour
many
carbon-carbon
double
boads
(G-C)
are
present
in
one
molecule
of I?
(n)
Sr
ggest
the
strucaral
formula
of
Y.
{2
marks}
(2
marks)
C*C=C-C
(-C=C
i
.-"c-
)
ID
tit
(2
marks)
(2
marks)
(a)
-t
l-l=L-
I
-c=:-
illuoz--
(ii
)
,3,ra', ,
6t'xbn,
fh*f
Lonc(v')
au'cl
(c)
(;
)
Nt
rq
r"'l
rlY,oul'
""'&-
=
a
25
*ul
,tu,hr('rl\
F,,
=
dL5',r':
g,aclt
,'-
*"'l
wil
'u"al
wlh
I
'n"[
?
F''
t
l,r'u,,
?vtt
twW'L'1
'f
u*h"tu
2
t'L
bc'nds
(
ii
)
-L
,l
-
I
,;
-'
*r,u
mott,.rlw'
rnttiS
,
(Axril1
(6*tS
-
5?
,)Y
I
8- Pure
ethanol
can
be
obtained
by
the
following
series
of
reactions.
Stage
1
--"+>
Dilute ethanol
solution
'ry@
(b)
{c)
(1
mark)
{1mark)
(2
marks)
(1
mark)
(2
marks)
(d)
(a)
ti)
State
the
process
in stage
7.
trer'nw,'{r'd^ln
(ii)
write
lhe,chemigal
equation
f^orthg
reacrion
rhat
occurs
in
srage
1.
Exprain*t;k::l^vdlff"?s*,Y,1 ;:y"J,1.r",1,
(i)
State
the
pracess
in
stage
2.
(n)
Explain
how 95"/"
pure
erhanol
is
obtained
in
this
process.
Ethanol
can
also
be obtained
from
petroleum
fraction.
tm'+Y@'tr@
*
I
Nt^lfiuLracby
"Ad'l't;t't-
j
sl*'ttn'
'f"
e+Lerc''
.
{i}
state
the
pr#esses
that-take
place
during
sLge
1
and
stage
2.
{2
marks}
(ii)
Name
the alkene
produced
in
stage
1.
(rlhttte-
(1
mark)
**
{iii)
'Write
the chemical
equation
for
the
reaction
that
occurs
in
stage 2.
{1
mark)
$1fi",,e-
dht
tol
;s
,*
obft'"'l
,i''t
stzy
I
hrr*e.
yu^+,i:
btU,l'
*d
Jr^'nl'tk''
ilup)
u)[y./L
St6p-
t:zr"th;+
ytitfw-
drlhuU
,v14
lfi/^
lt
/
7
Qil*-ct
(
c
)
(l)
h"*l'"'r''J
'Lsfi|"rtt'rr
(i)
hrttrr?
eltv^t:L
'ol$h}^
LN+^iw
N"V
TA
W'ol
'
C',t'ol
itn
'-
./'* \;:;;
't)+'
on 'Y"L'':l
tttd.thtoa'
f*-
dtvr"l
i'
l'tfitU\
ovvt
CAVa
[1ro
-s
tyrl5ovl
-
8/10/2019 OLevel Chempractical 02-11 ANS
23/37
6-
State
the
o3Eld_c
pSdscls
formed and
identify
the organic
compounds
A,
B,
C
and
D
irr
the
follorving
reactions.
(a)
A+NaOH+HCOONa+H,O
{2
marks}
(2
marks)
{2
marks)
(2
marks)
{b}
B
+
MgCO.
---->
(CH
Mg+FLO+CO,
g}*
r1o
H+FlO
7.
A fq*r
&ops
o{
concentrated
sulfuric
acid
are
added
to
a test
tube
containing
a
mixrure
of
V
aad
butanoic acid. The
mixture
is heated
and a sweet-smelling
substance
W is
obtained.
The
strucarral
formula
of
IV'is shown below.
o
ll
cH3crLCrL-c-o-cHrcH,
iai
-lEhat
type
of
reaction occurs
in
this experiment?
{bi
'What
is the purpose
of
concentrated
sulfuric
acid in
this
reaction?
{cl
Give the
name and
full
strucarral
formula
of
V.
td]
Predict
two
physical properties
of IV.
ie]
Stare
two
uses
of W.
ifj
Suggest
a
chemical method
which
can
be
used
to
distinguish between
{i}
butanoic
acid and
V.
{ii}
Y
and
V.
l-t
v-
'
,r
j
:l-r-
I
,1
l
{c}
C+C,H,OH_+
(d)
D
+
IlCrrO7+
(;
tft)
((
/
lr
i,{ i
[
'/
(2
marks)
{2
marks)
,,-',r.I5y-f,lf
i
'-|
i'rr"rr-
;tt11
-t'ul
(1
mark)
(L
mark)
(2
marks)
(2
marks)
{2
marks)
;t.;) ..i,.
tii,-;t
1tr.1-tt
t
(fi,.ttt,
t
i
/l
l
itit.(
{-z'."ilX
,'
fi
71t1.,L,11
(',]
(,
,);'
i*
;
/
i"
t,)
J,
'-,r',
',",),,r-'-
,
,.
'
"-
.
i'-
;-rl
r, {
\
I
jlr..t
r
l
l,
,i
,',-
i;'t
1-fiiir,1r:J,
-.
.l
.\- .
.r .
-.
"..
,r'k
,t,
l-
/.'1".'
t''t
-
t"
I
'-
i I
,.t
-
L-
t'\l
;:'
i'
't'
l
I
,,,,,
,1';',
'
"'i
. ,
i)u-,'
.\
'-'rlL
/)
:.:,);i:.,1ii--
y.
:li::,,:t,,,*
Jr
(-.
t'
.-'i
')."i,
I
.+
I
I \ -,\l(
t
\.
r
i''ft'
-
8/10/2019 OLevel Chempractical 02-11 ANS
24/37
Styren*butafiene
* ryt
(SBR)
is
a
type
of
synthetic
rubber The
structures
for
sryrene
and
butadiene
are
shown
below.
HHHH
II}I
C:C
C:C
tttl
c.H,
H
C.rL
H
sryrene
buadieae
(a)
\[(hat
type
of reaction
occurs
when
sryrene
reacts
with
butadiene?
Givea
one
reason
for
your
answef,.
(b)
One possible
s:trucrure
for
SBR
is
showr
below-
-
styrere
-
butadiene
-
styrene
-
butadiene
-
styrene
-
butadiene
-
Give the
parrial
stnrcture
of sBR
that
contains
two repeat
units.
(2
marks)
,
(2
marks)
(c)
State
two differences
between
styrene
and
SBR io
terms
cf
molecrrlar
structure.
(
a)
#al,hu
n
Ylw*tt;scl't't1
lL(t'tt
k t'ls:'1'Cb*
4o*br+
h'nrt
t;,"\
o&'ttrs
'bBcrurr
-
8/10/2019 OLevel Chempractical 02-11 ANS
25/37
9.
One type
of nylon is
catrled
nylon-5. Nylon-5 is
made
ft"*
""ri""iexanoic
acid.
The strucarral
formula of
aminohexanoic acid is shown below.
o
}I
{c}
td)
o
il
ir
c"*
i
N-
-r
;
;-t
(
{ .t
r)
5
Ctlt);
-N+Zr
('{.t1r}t;
-*El
.+t
r'-
t"rl,
).-
-
L
u'/-'h
-*
i'l
I
LI
i,C
)
C
it
c,
*(
(it
r)r
',t
c
{lt,.l,
*N
I
t.l
/1
{i
it
C-
I
I'J
.-
I
t4
H-O-6-tcg,-N-H
tu.1L.,iir,frt'*,
y:lrrrtw-'t5;,1
''n
H
{a)
What
rype
of
reacdon
occurs when
nylon-6
is
produced
from
aminohexanoic
acid?
(1
mark)
(b)
'Write
the chemical
equation,
using
surrctural
formula,
for
the reaction
to
produce
nylon-6.
(2
marks)
What
pype
of
linkage
is
present
in
nylon-6?
Draw a
circle
around this
linkage.
hntia
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8/10/2019 OLevel Chempractical 02-11 ANS
26/37
-l
NAME:
()
DATE:
ASSESSMENT
FOR
TOPIC:
,,CHEMICAL
BONDING,,
I
fne diagram
represents
the stmcture
of a metal.
oooo
erecrron--
o-o o
posirive'""-o
o
o o
(a)
Use
the
structure
to
explain
why
metals conduct
electricity. t1l
(a)
Drawadiagramof anatomof
silicon,showing^bowthe [ \a*-,
-,
,u',,.".i,:,,;,
electrons are
rranged
aod
the numbers
ofprotons
and
neutrons
in the
nucleus.
t3]
(b)
Give
two other
physical
properties
of
metals.
tZ)
{c)
Give
one chemical
property
of
metals.
tll
,t j
i
'
9't-
4
'L^Lt'i'in{ cl':cl4'r",
t
u)
r'1"12'L,tofiol',L^::.',.','"',1,,'1,,.n
_',,o,r.,,r,L
tlr-u,ut,,u-
)''yr..il;'
;"'l
7*
'Ltbe'i
,-)
r'.t'L
f;u'',1'
;',.'l"t'J
I
tu"*Q
(tt)
I
f;-tle'L;
t'i'c'
m{'lLlibt{''
4'';t-
al
;'
Tiy*'
t\'a-
'^it-'',"
i''''l
'i'.;'i
rtt'
;vc>i'e'|
./
lltl
i\t-t-
i{)i'""
(i
)
i/tlt,t: '
,',n'L'''L
'u
'l
''
lxl
i-'t-
\t'
"'
i'li*.r
lv':'"
ti"/
-.
--oqd",
{s.i;i(.
,'xic}.)
-
-{\
f\,,dre,.,
,-nl;t
SiliconandcJronarebothinGrouprVofthePeriodicTable.
(fl
t
/
'+1-
r \----'"
a1'.:)
tt
ul
L
sf
(")',{T
'*f'
L
(b)
Cabon
and silicon
each
form dioxides
in
which the
t
bonding between
the
atoms
is
covalent-
Carbon
dioxide
I
has
a
simple
molecular
structure
whercas silicon(IV)
oxide
(silicon
dioide)
has
a racromolecular
structurc-
G)
Draw
a
dot-and-cross
diagram
to
show
the
boding
in amolecule
of
carbon dioxide-
(i0
The structure
of
silicon{IY}
oxide
is drawn below.
\,,
-si
I
g
-t
;,,-o'\;:--?i-
'
-t'--
o
I
Silicon(IV)
oxide
has a high
melting
point where
as
carbon
dioxide
is a
gas-
'
(
i,l
r^
J'0;,\tt:t't'
i'
'ltl-t"'i
i's
['6'n;'l
UY*r,
,..,1
i.,,,'t
t\lj;'v
'{l
'"'
';
J'--u(
It
'lv,r
Jili,,*
fiv''6
lhria"
t['
i*ait"'ll7
-
'ruu-"
,r"'n:
tvt''l '^
i"l
',;
''*
l("
+r'
ht-,+
,
o**
'ult"
'-
'l
-s'
L
'ur'
t ll*;
i
lhv
b
'li.,-
,rJ'l''""'t"'t
r(r
, i
r'/
r
,'
n1i,'"hu
l
J ,,r.
'
,:"'
,:,,,,,.;,
.
l,
,
l,:
",
;[.
,',
'
'''u'
6l'""rt
-{l*'t
'*
''
o
rrl,l, ,,
'1't'
Explain
this
in terms
of
the
structure.s
sf
the
two
oxides.
Does
silico*{iY)
oxide
conduct
electricity?
Explain
your
answer
with
reference
to
its
stnrcture.
t5l
flll
"-u-*'t
h-.'''L'
;'t
5tl'u"',tn)
ct;L
'-''t-
-tfiur,,,
"1r'r
,r'i--
''"i
'""'lJ
bt''k""t
':'t,
4
'
",i-
,'-.'t..
;@*)
t..L.'l
,:
{n-:
-''-rl
I
.)
(iii)
-
8/10/2019 OLevel Chempractical 02-11 ANS
27/37
12
Diamord
and
gaPhire arc altotropes
of
carbon.
They
are both
composed
of macrornolecules-
Damond
GraPhite
Explain the
meaning
of the
following
tenns-
(i)
allotropes
(ii)
macromolecule
121
Graphite
is
used
to
make
lubricants
for
ergines.
Explain, in
terms
of its
stnrcnrre,
why
graphite can act
as
a lubricant
12)
ta)
(b)
(c)
Cive
one use
of diamood
which
depends
on
its
hardness.
tll
p,ft)Altrtafc
,
a,"c- ,L)ir"c"'l
':t
tJ
1h2
St,t,L*
'
a :'o4
'n
"
"t"
t'.nt
4tV'^
,' .,
,ldv
"';'1n'|'Y''n
nL
]L'r;'"
I
l*f,"",:::r::,,'
n le-.
o;
h'0""'
4fu-
iat'w
cwm't"'
I
I
(
i
r
)
lli.tet*[u,
1,,,;r^rr
r'
rL#;f,i'
{
nu*tt''
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8/10/2019 OLevel Chempractical 02-11 ANS
28/37
6rd
silicon
carbide
are
both
macromolecules'
Part
lcture
of silicon
carbide
is
shown
below.
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ta)
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Sta"
oo"
difference
between
the
stmctures
of
silicon
carbide
and diamond.
(i,
State
one similariry
between
the
structures
of
silicon carbide
and diamond
{21
(b)
Suggest
two
physical
properties
of
silicon
carbide-
QJ
(c)
Silicon
carbide
is
raanufactured
by
the
reduction
of
silicon
dioxide
with carbon.
SiO,
+
3C
2CO
+SiC
(i)
State
one
source of
silicon
dioxide-
(iii
What mass of
carbon is
needed to
make
20 tonnes
of silicon
carbide?
I4T
(d)
Silicones
are
pol5rmers
that
contain
the
elemenr''
silicon, oxygea,
carbon
and
hydrogen-
.
..
Suggest the
names
of three
combustion
products
oJs'
silicone
polyrner.
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