2018_chem_olevel_mj_paper1

Extracted Content: 2018_chem_olevel_mj_paper1

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ot Peformance Meconrenen!

ZIMBABWE SCHOOL EXAMINATIONS CONG,

General Certificate of Education Ordinary Leve}

| CHEMISTRY | 4024)
PAPER1 = Multiple Choice

NOVEMBER 2018 SESSION hg

Additional materials:
Electronic calculator
Multiple Choice answer sheet
Soft clean eraser
Soft pencil (type B or HB is recommended)

TIME | hour

INSTRUCTIONS TO CANDIDATES

Do not open this booklet until you are told to do so.

Write your name; centre number and candidate number on the answer sheet in the spaces
provided unless this has already been done for you,

There are forty questions in this paper. Answer all questions. For each question, there are

four possible answers A, B, C and D. Choose the one you consider correct and record your
choice in soft pencil on the Separate answer sheet.

Read very carefully the instructions on the answer sheet.

INFORMATION FOR CANDIDATES

Each correct answer will score one mark. A
Any rough working should be done in this bi

mark will not be deducted for a wrong answer.
A copy of the Periodic Table is printed on p.

ooklet.
age 12,

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J

n investigation to identify the in

ysing Paper chromatography was c

to Make
ined. attied Ty a fake o
obtai OUL. The chro” hundred dollar note

ro
Matogram shown was

<< level
reached

solvent

baseline

dye dye dye dye dye
ink a 3 4 5
on fake
note

The dye(s) present in the fake note are/were

A 3,4 and 5
B 2 and 3

c 6 only

D 3 and 4

i
Which pair correctly describes the structure of an atom?

narticles in the nucleus
electrons and neutrons

electrons and neutrons protons
protons and neutrons

protons and neutrons electrons

particles orbiting the nucleus

|

f

30..
; iNicon i Si?
What is the electronic configuration of the silicon isotope, 4 4 i

COP
fo bo

eae wn
NON A

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nysical properties of an ionic compound? Pp

Which row correctly gives the

electrical conduct

ctivity
when molten

ivity

a frical condu
melting point/ °C elec when solid

———————

Pand Q.
The table shows the atomic numbers of two elements, Q

Elements P and Q can combine to form

A a covalent compound PQ.
B a covalent compound PQz.
C anionic compound PQ.

D an ionic compound PQ>.

What is the correct formula of the compound formed between M*and z-9

A MZ
B MZ,
C MZ

4024/1 N2018 ef
rors?

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4 Which structure correctly shows the bona} , 'N8 in carbon dioxide? Key; X

carbon electrons
® Oxygen electrons

4+ 7 ;
A 2
2 LY)
B sx xe
Cc
°X ye
*e eo
o& .
Cc ¥c °
x
oS -
va
eo
D x. ° °
xX x

8 0.1 moldm™ solution of sodium carbonate can be prepared by dissolving

100 cm? of water

A 106 g of NagCO4) in

B 10.6 goof NazCOsis) in 100 aot ots
i Cc

10.6 g of NazCOais) in 1000 cm ve

106 g of NazCO3;s) in 1000 cm

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10

11

um hydroxide react ac

Phosphoric acid and potassi
+ 3H29¢)

HyPO4¢aq) + 3KOH(aq) 7 K3PO4(aq)
Which ions will not appear in the jonic equation?
A Haq) and OHfaq)
B _ Kgiqy and POSGaq)
C Haq and PO (aq)
DKqagy and OHfaq
Which equation does not result in a chan
A FeGea) ~ Fevaqy + ©
Bo Cufty + CO3Gq) 7 CuCOa¢s
C 2Haw + Ox) 7 2H1,0%9

D Agia) +e > Ago)

The production of carbohydrates during photosynthesis is an example

an endothermic reaction.
a combustion reaction.
an exothermic reaction.
a displacement reaction.

Sar

Sulphur dioxide reacts with oxygen according to the equation:
2802() + O2(g) = 2503(g) A H = —188 kJ/mol

Which factor increases the amount of sulphur trioxide produced?

increase in temperature
decrease in temperature
increase in amount of catalyst
decrease in pressure

IQS >

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cording to the equation:

ge of oxidation state of the species involved?

rien aver

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jead in the electrochemical] series “a

PEPE |

new element has been discovery, nd is b
8 believed

© be between zinc and

ill the element re i :

How wi ; act With soluti
1Ons of zinc
zine sulphate ;

lead nitrate

jaa displaced

scents elven lala ae — ————
ains in solution

mains in sohy

When heated, a metal carbonate decompos es to form

metal oxide and carbon

carbon dioxide and metal

carbon monoxide and Metal oxide
carbon dioxide and metal oxide

Sawer

Nitrogen and oxygen are separated from liquid air by the process of

A. liquefaction

B solidification

C fractional distillation —
D condensation

Which reagent could be used to distinguish between aluminium nitrate and zinc nitrate?

A sodium hydroxide solution
B ammonia solution

C barium chloride solution

D silver nitrate solution

A compound of nitrogen and hydrogen contains 87.5 % nitrogen.

What is its empirical formula?

A N2

B NH,
C NAH,
DD NoHg

F which all use
. mical processes
Respiration, combustion and rusting are chem! P
:

A water.

B heat energy.

Cc carbon dioxide.
D oxygen. +

go2a/i N2018

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19

20

21

22

23

itio
Which one is not a property of trans

A
B
Cc
D

Which pair correctly mate:

Samp,

In the blast furnace, molten iron is tapped off at the bo

They act as catalysts.
Their solutions are colourless.

Their solutions are coloured.
They have many oxidatio:

hes a metal and its extrac

metal
iron
platinum
gold
nickel

method
electrolysis
reduction
electrolysis
reduction —

above the molten iron because

A
B
Cc
D

7

n states.

slag is more dense than molten iron.
slag is less dense than molten iron. ;
molten iron and slag have the same density.
molten iron occupies more space than slag.

n metal ions?

tion method?

ttom of the furnace while slag Settles

Copper metal is used in electrical wiring and manufacture of pots and pans because of jts

A
B
Cc
D

high conductivity
high reactivity

’ cheap cost of production

abundance in nature

Which structures represents the same compound?

Sam,

2and4
1 and 2~
1 and 3
2and3

Tye

| |
HHH

He-6-C-o8

402411 Noo1g

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vet
reurl ov

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8

6

27

28

WIMGH Beste oo noone we
vi gua v 5
VILIPUULLUS Had UIG BCMCLAL buries wena

A alcohols

B carboxylic acids
C alkanes

p alkenes

When two molecules react to form one molecule, this is

A an addition reaction.

B _a substitution reaction.
Cc a condensation reaction.
D an esterification reaction.

Ethene may be manufactured according to the reaction:

heat
Cy He and C2 H4+H2

What type of reaction is this?

A polymerisation
B cracking
Cc addition
D hydrogenation

Which one is an example of a saturated hydrocarbon?

butane
ethanol
butene
butanol

sanwpr

Which compounds react to form ethylethanoate?

_ ethane and ethanol
ethanoic acid and ethanol

ethene and ethanoic acid
ethane and ethanoic acid

csaw>

go2aii N2018

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29 — Which structural formula represents nylon?

58s Cale
| | |
-C-C-C-C-
en |
H H HH

ie io
c ~b em boc 0- Cee -o-—P

iit i it
> Cage C- NCE N- Coz O- NAEN-

30 Which monomer unit polymerises to form starch?

A HOOC—1___}— CooH
B HO—(__}—0H

Cc H.N—__}—NH,

D HO—l__}—CooH

31 Which process describes the secondary stage of sewage treatment?

A sedimentation

B sludge activation
Cc precipitation

D discharge

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y

3

3%

36

ay]

10

ich ion is com)
which ! common to both Sewage
and fertiy;
'Zerg?

A nitrate

B carbonate
C chloride
D sulphate

nich process incre
P p ‘ases the amount of Sulphur dioxid
Oxide in the air?

A burning methane
.B burning coal

Cc burning wood

D burning ethene

ich pair correc’
. whee tly matches a pollutant 8a8 and its effect on the environment?

pollutant effect
A S02 depletes the ozone |:
aye
B NO, global warming ™
Cc CFC form photochemical smog
D CO, global warming

Oxides of nitrogen are produced in car engines because the

A bonds in nitrogen gas are easy to break.

B reactions can take place without interference.

C car engines have high temperatures for this reaction.
D reaction only need moderate warmth to proceed.

All of the following are used in waste management except

A composting.
B source reduction.
Cc incineration.
D fogging.
ation of water because it

Charcoal is used in the purific

coagulates the water.
removes inorganic ions.
makes water colourless:
disinfects the water-

San Se

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38

39

The diagram shows th

11
e energy profile for the reaction

Nagy + O2¢) > 2NOg).

Energy

progress of reaction

What is the energy change X?

A
B
Cc
D

enthalpy of combustion
bond energy

enthalpy of reaction
activation energy

Which one is an advantage of using herbal medicines?

Sap

DoOw>

herbal medicines cure better than pharmaceutical medicines.
herbal medicines are easily metabolized because they are organic.
herbal medicines are cheaper than pharmaceutical medicines.
herbal medicines have clear directions for use.

" Which chemical process takes place during the production of biodiesel?

esterification
addition
hydrogenation
combustion

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12 DATA SHEET The Periodic Table of the Elements

Group

167

*58-71 Lanthanoid series Gd
90-103 Actinoid series Gedotrium

8 = relative atomic mess
Key X= atomic symbol .
b = proton (atomic) Numbar

The volume of one mole of any gas is 28 dm’ at room temperature and pressure (r.t.p.)

ao2as NZ0LE

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