2024_chem_olevel_mj_paper2

Extracted Content: 2024_chem_olevel_mj_paper2

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Candidate Name ne Centre Number Cc andide te Number

(mats GuaR DIOLA [4447852954215 |

ne

ict he
ZIMBABWE SCHOOL EXAMINATIONS COUNCIL

General Certificate of Education Ordinary Level

CHEMISTRY 4024/2
PAPER 2 Theory 2 hours

JUNE 2024 SESSION

Additional materials:
Electronic calculator
Answer booklet

Se | y,

INSTRUCTIONS TO CANDIDATES
Write your name, centre number and candidate number in the spaces at the top of this page and on
all separate answer paper used.
Answer all questions in Section A and any four FOR EXAMINER’S USE
from Section B.
At the end of the examination, fasten any separate answer paper |Section A
used securely to the question paper.
Enter the numbers of Section B questions you have answered Section B
in the grid. LL

INFORMATION FOR CANDIDATES
The number of marks is given in brackets [ ] at the end of each

question or part question.

A copy of the Periodic Table is printed on page 16. —

TOTAL

This question paper consists of 16 printed pages.
Copyright: Zimbabwe School Examinations Council, J2024.

© ZIMSEC 2024 [Turn over

MATHS GUARDIOLA +447852954215
PRT TTT TTT TRI TTTTTTT TTT TTT TTT MTT TUTTI MOE

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Candidate Name

Centre Number Candidate Num}

C MATHS GUARDIOLA | 4447852954215 L.

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i

Section A

Answer all questions from this section. elit
amy
t

Write your answers in the spaces provided on the question paper. :

rr)

Fig 1.1 shows the dot and cross diagram of two ions of elements represented
by X and ¥,

3+

Fig 1.1

(i) rite the formula ofc poun y |
Write : ce ound forr ed when elements represented b

t]

Explain why the Compound exists as a solid at toom temperature

(ii)

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Candidate Name Centre Number Candidate Number

C MATHS GUARDIOLA 7 | 4447852954215 »)

(iii) Draw a dot and cross diagram to show the bonding in the compound
formed between Y and fluorine.
For

| Examiner's
Use

[2]

(b) — Explain why

1. a mixture of iodine and sodium chloride can be separated by heating,

2. rain water corrodes buildings.

| equations to describe what happens when

(c) Write balanced chemical

1. magnesium burns in air,

hloride solution is added to dilute sulphuric acid.

2. barium ¢

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ecceonsnu pm ar PvAnvUT A MINRU TATA THETA

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—_—_—_- a he

Centre Num ber ————-—

Candidate Name
ameiiiganianiaa 6 * T raa7952954015 |

F ons of three single dyes |
2. (a) Fig 2.1 shows a chromatogram obtained using name F and F). S
(green, brown and purple) and three other substance >

_E ee |
Filter _ |
paper
solvent |
Paper |
|
® md
—___———-®—_ |
—e- |
-8- o- —8-
f @ @- -@ @
start -e—- ©
line D E F greem brown purple
Fig 2.1

(i) Identify the two dyes present in substance D.

[21
(ii) Identify, with a reason, the dye that is most absorbed b

the filt
de y ilter paper.

MATHS GUARDIOLA +447852954215

TH

Cr

Exam,

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NS GUIMEESTOANS INGE

a SS Centre Number Cand

: = Rieti idate Number
—MATHS-GUARDIOLA _ | #447852954215-

ne on

ii State cr uses of
(ii) State two other uses of Paper chromatography other th

dyes. an separation of |
ib t same
| Use
|
2.
\
|
[2|
3. (a) Fig 3.1 shows a simple cell.
|
; copper
zinc
dilute sulphuric
acid
Fig 3.1
(i) Identify the positive and negative electrodes.
positive
negative
. 21
(19) Write an equation of the reaction that occurs at the negative electrode.
cesses ti]
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MATHS GUARDIOLA 4447852954215 [Turn over

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HANAN)

MATHS GUARDIOLA 4447852954215

(iii)

‘tive electrode.
State the observation made on the positive clectr

(b) @ Dilute sulphuric acid can be electrolysed to produce hydrogen and
oxygen
Identify the products at the

1 cathode,

2 anode.

[2]
Gi) Write half equations for the reaction at the
1 anode,

2 cathode.
a (21
(@)

Table 4.1 is an incomplete Table showing some environmental
pollutants and their effects.

Table 4.1

pollutant

environmental effect(s)

Complete the Table 4.1 by stating the missing information.

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MATHS GUARDIOLA 4447852954215

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Candidate Name Centre Number Candidate Number

(MATHS GUARDIOLA 4447852954215 | >

(b) Fig 4.1 shows the energy profile diagram for the manufacture of ammonia by
the Haber process.

a
energy/
kImol"!

reaction progress
Fig 4.1

(i) Describe and explain what happens in sections labelled

1. A,

[4]
(ii) | Name energy change represented by C.
(1]
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TTT TATA

For
Examiner's
Use

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MATHS GUARDIOLA 4447852954215

5, (a) The inter-conversion between dichromate Cr,O07 and chromate (V1) ions,
; . 7

CrO; . can be shown by the follow ing dynamic equilibrium.

E xan
C7207 i, + HO, 9CtO; a, + 2H.

orange yellow

(i) Define the term dynamic equilibrium.

(ii) Describe and explain what happens to the equilibrium when

. eal + . * +
1. the concentration of H ions is increased,

2
2. CrO, ions are removed.

[4]

(b) State the observable changes that occur when sulphur dioxide gas is bubbled
in sodium dichromate solution.

{1}

(c) Name the type of reaction which occurs when
1. fats are boiled in sodium hydroxide,

2. a carboxylic acid reacts with an alcohol.

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| ATH MATHS GUARDIOLA 4447852954215 C) Zimsec 2024

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Cen Numl Htre Number Candidate Nur

4447852954215

MATHS GUARDIOLA

(a)

(b)

(c)

‘
)
Section B
Tsive
, , .
any four PUESTIONS from this section

Write
C Vou Cr,
CUMSWOLS ON SCPUVUC any yy er paper provided.

Vip 6.1 5
Esl we .
1OWS a Cooling, Curve of @ substance, M
A
RO y mm
Tomperature
\c
AY
Ce eit ie us
\E
Time/min >
Fig 6.1
(i) lxplain the shape of the curve at section B.

(ii) Deduce the boiling point of substance M.

(iii) State the processes occurring at section

Name the state of the substance at room temperature.

(iv)
(v) State and explain the effect of the impurities on the boiling point
of substance M.
Explain why
(i) different solids do not mix when placed on top of each other,

(ii) cigarette smoke can affect a by-stander in the same room.

Draw an energy level diagram for an endothermic reaction.

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MATHS GUARDI

OLA 4447852954215

[2]
[1]

[2]

[Turn over

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[ 4447852954215 |

MATHS GUARDIOLA 10

(d) (i)

Explain what happens to the anode and cathode when a lead-acid
battery is discharging.
(ii) Describe

any one w,
battery,

ay for Maintaining and caring of the lead-acid

(a) (i)

A Catalytic Converter cony

erts unburnt hydrocarbons such as
CsHig to harmless wastes.

The reaction that occurs is shown.

Ca g(g) + 25

—_ 8CO2(4) + 9H.O;
2 2(9)

g)

Calculate the v
of the hydroca;

olume of ca
rbon reacts,

tbon dioxide produced when 1.96 g

clean water
Fig 7,1

Describe and €xplain what happens in

1. sand filters,

2. flocculation and sedimentation tank,

(ii)

Name any two home based water treatment methods,

5
MATHS GUARDIOLA 444785295421

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Candidate Name

ndidate Name Centre Number Candidate Number

— _ 7 iC

(__MATHS GUARDIOLA “yaa7es2054215 | id
RDIOL/ | +447852954215 | )

() (i)

The chemical equation shows how calcium oxide is produced in
large quantities in Lime Kiln.

| For
| Examiner's

CaCOxs) heat CaQ(s) + COx9) | Use
|
Calculate the mass of calcium carbonate required to produce |
61.60 Kg of calcium oxide. [2] |
(ii) Describe the problems associated with the quarrying of calcium |
carbonate. [2] |
(iii) — Describe the steps that could be taken to overcome the problems
| in (ii). {1]
|
| 8. (a) Fig .8.1 shows how an organic compound, G, can be converted to
different organic compounds.
CH,CH CH, OH
acidified sodium G concentrated
dichromate, boil /@ sulphuric act
A B
ai)
CH,CH,CO2CH3
Fig 8.1
(i) Draw displayed structural formula of
1. A,
2, B. 2]
(ii) ‘State the homologous series to which B belongs. (1
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’ - ‘andidate Num! ‘andidate Name Centre Number Candidate N

~ MATHS GUARDIOLA +447852954215 il —
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(iii) State the type of reaction occurring in

l. reaction (i),
2. reaction (il). [2|
(iv) State the observable changes that occur in
1. reaction (i),
2. reaction (ii). ;
[2]

(b) (i)_—_—“Fig. 8.2. shows results when a metal, M, was reacted with dilute
hydrochloric acid. |

40 cm?
H, gas

solution formed by
M+ Claq)

Fig 8.2

MATHS GUARDIOLA +447852954215

siTiee. SER

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candidate Name 7 oe Centre Number Candidate Number

(MATHS GUARDIOLA ee [447852954215 | _

13

I he experiment was repeated with metals N ad P. The results are shown |
in the table. |
ee ee For
. . 3 } Fxaminer
metal volume of hydrogen/em |
= _ _ —— —_ — +
N 0 |
a |
|
Pp 12 |

Arrange the three metals, M, N and P in decreasing order of
reactivity.

1]

(ii) Explain the order in (i).

(ii) M forms an ion, Af?t.

Write a balanced chemical equation for the reaction of M with

dilute hydrochloric acid. [2]
(c) Asubstance X with an M, value of 34 is composed of 5.90 % hydrogen
and 94.10 % oxygen.
Calculate the molecular formula of X. [2]
9. @ @ An element, X, of atomic mass 88, reacts with chlorine to form
a chloride containing 44.7% chlorine.
Calculate the empirical formula of the chloride. [4]

(ii) Suggest the type of bonding that exist between X and chlorine. [1]

A mass of 0.048 g of magnesium was reacted with excess dilute

(b) @
hydrochloric acid at r.t_p to produce hydrogen.
Write a balanced chemical equation for the reaction. [2]
(ii) Calculate the volume of the gas produced at r.t.p. (3]

MATHS GUARDIOLA +447852954215

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Candidate Name Centre Number Candidate Number

_—_—___._ an .
d MATHS GUARDIOLA ee _ 4447852954215 )

I4
(c) (i) Fig 9.1 shows part ofa polymer

hor

tT vaminer

|
see 7 ir
H—C—H H

H

Fig 9.1

Deduce the structural formula of the monomer(s).

(ii) State the type of polymerization that forms this polymer.
(ii) Describe two environmental problems associated with the |
disposal of the polymer.

(iv)

Suggest one method of disposing off the polymer,
10. (a) ~~ A mass of 0.54 g impure ammonium sulphate fertilizer reacted with
warm sodium hydroxide solution. 140.00 em of
produced at room temperature and
the reaction is shown:

ammonia gas were

pressure. The chemical equation for
(NH:)2SO43+ 2NaOH aq? NaySOgiag) + 2NH x). 2H 0)

Calculate the

1. concentration of sodium hydroxide solution,

2. percentage purity of the fertilizer,
{6]
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| «Cc Zimsec 20
HANNAH «

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NX, 1 ate F; > 7 . 7 x Candidate Name Centre Number Candidate Number

(mats GUARDIOLA | 4447852954215 ¥ )
15
(b) Describe how pure crystals of sodium sulphate are produced. [3]
(c) (i) Describe and explain the difference in reactivity of magnesium For
and barium. [4] Bxamifeys
(ii) Explain why a white solid is observed when calcium is added to
magnesium sulphate solution. [2]

MATHS GUARDIOLA +447852954215

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DATA SHEET The Periodic Table of the Elements

Group
| ii) e}
1 : | ——————— +
; HH | He
Hydrogen: | Helium
1__J co
, : WW 12 14 16 19 20
Li Be B c N ce] F Ne al
. — Boron Carbon Nitrogen Oxygen Florine Neon 9
5 6 = 8 9 10 Pa
a — —= wn
2 a a7 28 3 32 35.5 40 NX
Na Ma Al Si P s cl Ar oo
~ seagre Atumioiam sacon | Phosphowe Sulphur Chine Argon +
\ 13 14 15 16 17 18 _| Q zt
‘ 64 65 70 73 75 79 80 a4 Si«
K Ca Cu Zn Ga Ge As Se Br Kr $a
= Copper Zine Gatium Gomneniumn Arsenic Sotoniom Bromine Krypton qz=
20 a az EY) os | 95 38 = a
ss ss 108 112 145 mW9| 122 128 127 131 s
Rb Sr Ag Cd In Sn Sb Te JI Xe ro)
Renee Siver Cadmium Induen Tr Antimony Tesurisen lexsine Xenon Ww
@ 48 49 50 St 52 53 Ss =
t 197 201 204 207 | 209 | a
Cs Ba Au Hg Tl Pb Bi Po At Rn =
— o- Gold Mercury Thatum Lead Besmuth Polonum | Astute Radon
s ~ 60 81 82 83 84 85 86
Fr Ra Ac
— nan ho
a a
= +40 we )~Sd)]”SCO™<em>~</em>~“—~«~SSti<‘iSSC<em>CdSC(<‘éi SS 17 O])tts9SCid]st(i‘i]SSCSTSC(ié‘éSS:CO</em>dS;SCS*«éKGS
“88-71 Lanthan: nes | |
56-71 Lanthancid serie Ce Nd Pm sm Eu Gd | Tb Dy Ho Er
*80-103 Actinoid series = Neodymam | Promenen | Semanum | Eumpam Gadotnium | Terpum | Dysproshm | Holmium Ertvum
$8 6 61 | 62 63 64 65 J 67 | 68
——— — + — — r r
« 22 238 | } | | |
Key x X= atomic symdo! Th U Np | Pu Am =| Cm | Bk Cf Es Fm
. — rare nec | Runun Amero | Cum | Barketum Cattornivm | Einstenum | Fenmam
> = proton (atomic) Number | 55 ot a 33 is 25 | 96 97 98 [9% | 100

The volume of one mole of any gas is 28 dm* at room temperature and pressure (r.t.p.)

| na

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