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Chemistry Theory

This document is a mock examination paper for a Chemistry subject from a secondary school in Malawi, dated October 5, 2021. It includes instructions for answering questions, a breakdown of sections, and various chemistry-related questions worth a total of 100 marks. The exam covers topics such as chemical equations, properties of elements and compounds, and practical applications of chemistry in everyday life.

Uploaded by

komwaj5
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
0% found this document useful (0 votes)
32 views10 pages

Chemistry Theory

This document is a mock examination paper for a Chemistry subject from a secondary school in Malawi, dated October 5, 2021. It includes instructions for answering questions, a breakdown of sections, and various chemistry-related questions worth a total of 100 marks. The exam covers topics such as chemical equations, properties of elements and compounds, and practical applications of chemistry in everyday life.

Uploaded by

komwaj5
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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CANDI

DATENAME:
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HI
LLCRESCENTPVTSECONDARYSCHOOL
2021MALAWISCHOOLCERTI
FICATEOFEDUCATI
ON
MOCKEXAMI
NATI
ON

CHEMI
STRY
Subj
ectNumber
:M038/
I
Tuesday
,05Oct
ober
,2021 Ti
meal
l
owed:
2hr
s
PAPERI
(
100Mar
ks)

Quest
ion Ti
cki
f Donotwr
it
ein
Number answer
ed
t
hesecol
umns

10

Page1of1
11

I
nst
ruct
ions

1.Thi
spapercont
ains9pr
int
edpages.Pl
easecheck.

2.Answeral
lquest
ionsi
nal
lsect
ionsi
nthespacespr
ovi
ded.

3.Wr
it
eyourName/Exami
nat
ionNumberont
opofeachanswersheety
ouhav
eused.

4.I
nthet
abl
epr
ovi
dedt
other
ightoft
hispaget
ickagai
nstt
hequest
iony
ouhav
eanswer
ed.

5.Useofel
ect
roni
ccal
cul
ator
sisal
l
owed.

©2021HI
LLCRESCENTPVTSECONDARYSCHOOL

SECTI
ONA(
70Mar
ks)

Answeral
lthequest
ionsi
nthespacespr
ovi
dedi
nthi
ssect
ion

1.a)St
atet
wobr
anchesofchemi
str
y.
_
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___
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___
___
___
___
___
_(2mar
ks)
b)Gi
veanyt
wodi
ff
erencesbet
weenanel
ementandacompound
_
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___
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___
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_
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_(4mar
ks)
c)Def
ineani
sot
ope

Page2of2
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___
_(1mar
k)
d)Anat
om ofel
ementXcanber
epr
esent
edbyt
hesy
mbol
6X
16
.I
fel
ementXcont
ains70%of
16
Xand30%of18X.Cal
cul
atet
her
elat
iveat
omi
cmass.

(
3mar
ks)
2.a)Wr
it
eabal
ancedchemi
cal
equat
ionf
ort
her
eact
ionbet
weensodi
um met
alandoxy
gent
o
f
orm sodi
um oxi
de.
_
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___
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___
___
___
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___
_
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
_(3mar
ks)
b)Expl
ainwhyhexanehashi
ghermel
ti
ngpoi
ntt
hanet
hane
_
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___
___
___
___
___
___
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___
_
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___
___
___
___
___
___
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___
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___
___
___
___
___
___
___
___
___
_(2mar
ks)
c)St
ateanyt
womet
hodsofsepar
ati
ngmi
xtur
es.
_
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___
___
___
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___
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___
___
___
___
___
___
___
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___
___
___
___
___
___
___
_(2mar
ks)
d)Expl
ainwhymet
alshav
ehi
ghboi
l
ingandmel
ti
ngpoi
nts.
_
___
___
___
___
___
___
___
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___
___
___
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___
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___
_(2mar
ks)
3.a)Descr
ibeanyt
woef
fect
sofhar
dwat
eri
nev
ery
dayl
i
fe.
_
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___
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___
_
___
___
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___
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___
___
___
___
___
___
___
___
___
___
___
___
_
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
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___
___
___
___
___
_
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
_(4mar
ks)
b)Expl
ainhowphosphor
uscani
mpr
ovef
oodsecur
it
y.
_
___
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___
___
___
___
___
___
___
___
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___
_(2mar
ks)
c)Wi
tht
heai
dofadotandcr
ossdi
agr
am,
drawt
hest
ruct
ureofmet
hanemol
ecul
e,CH4(
C=6,
Page3of3
H=1)

(
3mar
ks)
d)Def
ineacondensat
ionr
eact
ion
_
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___
___
___
___
___
___
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___
___
___
___
___
___
_
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___
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___
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___
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___
___
___
___
_(1mar
k)
4.Ammoni
aisanexampl
eofast
rongbase.
a)Whati
sa“
str
ongbase”
?
_
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___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
_(1mar
k)
b)Wr
it
eachemi
cal
equat
iont
oshowt
hei
oni
zat
ionofammoni
ainwat
er
_
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___
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___
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___
___
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___
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___
___
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___
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___
___
___
___
__
_
___
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___
___
___
___
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___
___
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___
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__
_
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___
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__(
3mar
ks)
c)I
dent
if
yoneconj
ugat
eaci
dbasepai
rfr
om t
heequat
ioni
n4b
_
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_(1mar
k)

5.a)Dr
awanener
gyl
evel
diagr
am f
ort
hef
oll
owi
ngchemi
cal
react
ion.
NaOH(aq)+HCl
(
aq) NaCl
aq)+
( H2O(l) , ∆H=-
57kj
/mol

(
3mar
ks)

Page4of4
b)I
sther
eact
ioni
n5(
a)endot
her
micorexot
her
mic?
_
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__(
1mar
k)
c)Gi
vear
easonf
ort
heanswert
o5(
b)
_
___
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___
___
___
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___
___
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___
___
___
___
___
___
___
___
_(2mar
ks)
d)Whati
sthemeani
ngof(
aq)and(
l)i
ntheequat
ion?
_
___
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_
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___
_(2mar
ks)

6.a)Tabl
e1showsat
omi
cnumber
sandel
ect
ronconf
igur
ati
onofsomeel
ement
s
Tabl
e1
El
ement At
omi
cNumber El
ect
ron
conf
igur
ati
on

A 18 2,
8,8

B 10 2,
8

C 20 2,
8,8,
2

D 12 2,
8,2

E 2 2

F 9 2,
7

i
) I
dent
if
yanel
ementt
hatcomesf
ir
sti
nper
iod2
_
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___
___
___
___
___
___
___
___
__(
1mar
k)
i
i
) Whi
cht
woel
ement
scanf
orm posi
ti
vei
ons?
_
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___
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___
___
___
___
___
___
___
___
___
___
___
___
_(2mar
ks)
i
i
i)Gi
vear
easonf
ort
heanswert
o6a(
ii
)
_
___
___
___
___
___
___
___
___
___
___
___
___
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___
___
___
___
___
___
___
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___
___
___
___
___
___
___
_
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___
___
___
___
___
___
___
___
___
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___
___
___
___
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___
___
___
_(2mar
ks)
b)Whatar
ehy
drocar
bons?
_
___
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__(
1mar
k)
Page5of5
c)Fi
gur
ebel
owshowsf
ormul
aofsomeor
gani
ccompoundsA,
B,CandD.
C3H7OH C5H10 C2H5COOH C9H20
A B C D
i
) Whi
chcompoundsar
ehy
drocar
bons?
_
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__
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__(
2mar
ks)
i
i
) NamecompoundA
_
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___
___
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___
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___
___
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__
_
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(1mar
k)
i
i
i)Dr
awmol
ecul
arst
ruct
ureofcompoundC.

(
2mar
ks)

i
v)Dr
awt
hest
ruct
ureoft
het
woi
somer
sofbut
ane(
C4H10)

(
2mar
ks)

7.a)Thef
oll
owi
ngi
spar
tofar
eact
ivi
tyser
ies
Magnesi
um (
Mg)
Al
umi
nium (
Al)
Zi
nc(
Zn) I
ncr
easi
ngr
eact
ivi
ty
I
ron(
Fe)

Page6of6
Copper(
Cu)

i
) Whi
cht
woel
ement
swi
l
ldi
spl
acezi
nc(
Zn)f
rom i
tsoxi
de?
_
___
___
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___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
_
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
_(2mar
ks)
i
i
) Gi
vear
easonf
ory
ouranswert
o7a(
i)
_
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
_
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
__(
1mar
k)
b)Thef
oll
owi
ngar
ehal
fequat
ionsf
ort
her
eact
ionbet
weenmagnesi
um (
Mg)andSi
l
ver
ni
tr
ate(
AgNO3)
:
+
2Ag( +2e
aq) 2A0
g(s)
o
Mg(
s)–2e M2+
g( aq)

i
) Wr
it
eaf
ull
chemi
cal
equat
ionf
ort
her
eact
ion
_
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
_
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
_(2mar
ks)
i
i
) Namet
her
educi
ngandoxi
dizi
ngagent
sin7b(
i)
_
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
_
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
_(2mar
ks)

8.a)Def
ineai
rpol
l
uti
on
_
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___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
_
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
_(1mar
k)
b)Li
stdownanyt
wocommonpol
l
utant
sofai
r.
_
___
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___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
_
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
_(2mar
ks)
c)Gi
veanyt
hreemaj
orsour
cesofwast
es
_
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
_
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
___
_(3mar
ks)
d)Ahy
drocar
boni
sfoundt
ocont
ain24gofcar
bonand4gofhy
drogen.Wor
kouti
ts

Page7of7
empi
ri
cal
for
mul
a.

(
3mar
ks)
SECTI
ONB(
30Mar
ks)
 Answeral
lthequest
ionsi
nthi
ssect
ion
9. Wi
tht
heai
dpfawel
ll
abel
l
eddi
agr
am,
expl
ainwhathappensdur
ingt
heel
ect
ropl
ati
ngofan
i
ronnai
lwi
thcopperusi
ngcopperchl
ori
deasel
ect
rol
yte.

_
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___
___
___
___
___
___
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___
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Page8of8
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_(1
0mar
ks)
10.Descr
ibehowy
ouwoul
dpr e250cm3ofa1.
epar 8M sol
uti
onofsodi
um hy
droxi
de,
NaOH
usi
ngsodi
um hy
droxi
depel
l
ets.
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Page9of9
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_(10mar
ks)
11.Wi
tht
heai
dofawel
ll
abel
l
eddi
agr
am,
desi
gnanexper
imentt
oinv
est
igat
ethecondi
ti
ons
necessar
yforr
ust
ing.

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_(10mar
ks)

ENDOFQUESTI
ONPAPER
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