This document contains a Sulit (confidential) topical test on electrochemistry. It consists of multiple choice questions testing understanding of concepts such as electrolytes, electrolysis of molten compounds, and electroplating. The questions provide diagrams of apparatus set ups and ask students to identify processes, reactions, and products of electrolysis experiments.

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di sini TOPICAL TEST 6: ELECTROCHEMISTRY
UJIAN TOPIKAL 6: ELEKTROKIMIA
PAPER 1 KERTAS 1
1 Which of the following is true about B Solid sodium chloride contains electrolysis of molten magnesium
an electrolyte? atoms while molten sodium chloride?
Antara yang berikut, manakah benar tentang chloride contains ions. Antara yang berikut, manakah menunjukkan
elektrolit? Pepejal natrium klorida mengandungi persamaan setengah di katod dalam
I Electrolyte conducts electricity in atom manakala leburan natrium klorida elektrolisis leburan magnesium klorida?
molten state. mengandungi ion. A 2Cl () → Cl2 () + 2e
Elektrolit mengalirkan elektrik dalam C Solid sodium chloride contains 2Cl (ce) → Cl2 (ce) + 2e
keadaan leburan. molecules while molten sodium B 2H+ (aq) + 2e → H2 (g)
II Electrolyte conducts electricity in chloride contains ions. 2H+ (ak) + 2e → H2 (g)
solid state. Pepejal natrium klorida mengandungi C Mg2+ () + 2e → Mg (s)
Elektrolit mengalirkan elektrik dalam molekul manakala leburan natrium Mg2+ (ce) + 2e → Mg (p)
keadaan pepejal. klorida mengandungi ion. D 4OH– (aq) → 2H2O () + O2 (g) + 4e
III Electrolyte is soluble in water. D Solid sodium chloride contains 4OH– (ak) + 2H2O (ce) + O2 (g) + 4e
Elektrolit larut dalam air. atoms while molten sodium
IV Electrolyte undergoes chemical chloride contains molecules. 8 Which of the following happens
decomposition when it conducts Pepejal natrium klorida mengandungi during the electrolysis of molten
electricity. atom manakala leburan natrium klorida
mengandungi molekul.
sodium bromide?
Elektrolit mengalami penguraian kimia Antara yang berikut, manakah akan berlaku
semasa mengalirkan elektrik. semasa elektrolisis leburan natrium bromida?
A I and II only C II and IV only 5 Diagram 1 shows the apparatus set- I Sodium ions are attracted to the
I dan II sahaja II dan IV sahaja up of an experiment. cathode.
B II and III only D I and IV only Rajah 1 menunjukkan susunan radas bagi Ion natrium tertarik ke katod.
II dan III sahaja I dan IV sahaja satu eksperimen.
II Bromide ions are attracted to the
2 Which of the following is not an anode.
Ion bromida tertarik ke anod.
electrolyte?
Antara yang berikut, manakah bukan
III Electrons are moving from anode
elektrolit? to cathode.
A Molten glucose Elektron bergerak dari anod ke katod.
Leburan glukosa IV At the cathode, bromine ions
B Aqueous ammonia accept electron from anode.
Akueus ammonia Di katod, ion bromin menerima elektron
C Molten lead (II) bromide dari anod.
Diagram 1 Rajah 1
Leburan plumbum (II) bromida A I, II and III only
Which of the following is most I, II dan III sahaja
D Molten potassium iodide
Leburan kalium iodida
probably substance X? B I, II and IV only
Antara yang berikut, manakah I, II dan IV sahaja
berkemungkinan besar ialah bahan X?
3 Naphthalene does not conduct C I, III and IV only
A Molten napthalene I, III dan IV sahaja
electricity because it Leburan naftalena
Naftalena tidak mengalirkan elektrik kerana
D II, III and IV only
B Pure ethanol II, III dan IV sahaja
A contains freely moving electrons. Etanol tulen
mengandungi elektron yang bergerak C Solid lead (II) bromide
bebas. Pepejal plumbum (II) bromida 9 Which of the following is true about
B has very low melting points. D Potassium iodide solution the process that takes place in the
mempunyai takat lebur yang sangat Larutan kalium iodida electrolysis of molten copper (II)
rendah.
bromide?
C consists of molecules which are Antara yang berikut, manakah benar tentang
6 What are the ions present in molten
uncharged particles. proses yang mengambil bahagian dalam
terdiri dariapda molekul-molekul di mana
lead (II) bromide? elektrolisis leburan kuprum (II) bromida?
ialah zarah-zarah tidak bercas. Apakah ion-ion yang hadir dalam leburan
plumbum (II) bromida? Anode Cathode
D contains ionic compounds which Anod Katod
A PbBr2
can dissolve in water. PbBr2
mengandungi sebatian ion yang boleh
B Pb and Br A O2 H2
larut dalam air.
Pb dan Br Br2 H2
B
C Pb2+ and Br–
4 Which of the following is true about Pb2+ dan Br– C O2 Cu
the particles present in solid and D Pb2+ and Br2–
molten sodium chloride? Pb2+ dan Br2–
D Br2 Cu
Antara yang berikut, manakah benar tentang
zarah-zarah yang hadir dalam pepejal dan
leburan natrium klorida? 10 Diagram 2 shows the arrangement of
A Both solid and molten sodium apparatus for electrolysis of iron
chloride contain ions. 7 Which of the following shows the (III) nitrate solution.
Kedua-dua pepejal dan leburan natrium half equation at the cathode in the Rajah 2 menunjukkan susunan radas bagi
klorida mengandungi ion-ion. elektrolisis larutan ferum (III) nitrat.
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di sini TOPICAL TEST 6: ELECTROCHEMISTRY
UJIAN TOPIKAL 6: ELEKTROKIMIA
PAPER 1 KERTAS 1
II Concentration of ions in the
solution.
Kepekatan ion dalam larutan.
III The molecular mass of the atom
used.
Jisim molekul bagi atom yang digunakan.
IV Position of ions in
electrochemical series.
Kedudukan ion dalam siri elektrokimia.
A I, II and III only
I, II dan III sahaja
B I, II and IV only
Diagram 2 Rajah 2 Diagram 3 Rajah 3 I, II dan IV sahaja
What is formed at carbon electrode Q? What need to be changed in order to C I, III and IV only
Apakah yang terbentuk di elektrod karbon Q? get different gas from this I, III dan IV sahaja
A Hydrogen gas experiment? D II, III and IV only
Gas hidrogen Apakah yang perlu diubah supaya mendapat II, III dan IV sahaja
B Oxygen gas gas yang berbeza daripada eksperimen ini?
Gas oksigen A Substitute carbon electrodes with 16 Diagram 4 shows the set-up of the
C Iron metal copper electrodes. apparatus used to electroplate an
Logam besi Gantikan elektrod karbon dengan iron key with silver.
D Nitrogen gas elektrod kuprum. Rajah 4 menunjukkan susunan radas yang
Gas nitrogen B Use a more concentrated copper digunakan untuk menyadur kunci besi dengan
(II) chloride solution. argentum.
11 What are the ions that present in Gunakan larutan kuprum (II) klorida
yang lebih pekat.
dilute copper (II) chloride solution?
Apakah ion-ion yang wujud dalam larutan C Change the position of the
kuprum (II) klorida cair? battery.
A Cu2+ and Cl– Tukarkan kedudukan bateri.
Cu2+ dan Cl– D Substitute carbon electrodes with
B Cu2+, Cl– and H2O platinum.
Cu2+, Cl– dan H2O Gantikan elektrod karbon dengan
C Cu2+, H+, Cl– and OH– platinum.
Cu2+, H+, Cl– dan OH–
D Cu2+, H+, Cl– and H2O 14 Which of the following is the true
Cu2+, H+, Cl– dan H2O reactions taking place during the Diagram 4 Rajah 4
electrolysis of dilute copper (II)
12 The electrolysis of aqueous sodium What is the observation after 30
sulphate solution using carbon as the
nitrate using carbon electrode was minutes?
electrodes? Apakah pemerhatian selepas 30 minit?
carried out in a lab. Which of the Antara yang berikut, manakah benar tentang
following is true about this tindak balas yang mengambil bahagian I At anode, silver foil become
experiment? semasa elektrolisis larutan kuprum (II) sulfat thinner.
cair dengan menggunakan karbon sebagai Di anod, foil argentum menjadi lebih
Elektrolisis akueus natrium nitrat
elektrod? nipis.
menggunakan elektrod karbon dijalankan
dalam makmal. Antara yang berikut, Anode Cathode II At anode, shinny grey deposits
manakah benar tentang eksperimen ini? Anod Katod are formed.
A The sodium ions are discharged Di anod, enapan kelabu berkilat
A SO42–→ Cu2+ + 2e → Cu terbentuk.
at the cathode.
Ion natrium dinyahcaskan di katod. S + 2O2 + 2e III At cathode, gas bubbles are
B The nitrate ions are discharged at released.
B 4OH– → Cu2+ + 2e → Cu Di katod, gelembung gas dibebaskan.
the anode. 2H2O + O2 + 4e
Ion nitrat dinyahcaskan di anod. IV At cathode, shinny grey deposits
C Hydrogen gas is produced in the C SO42– → 2H+ + 2e → H2 are formed.
anode. S + 2O2 + 2e Di katod, enapan kelabu berkilat
terbentuk.
Gas hidrogen dihasilkan di anod. D 4OH → –
2H + 2e → H2 +
D Oxygen gas is produced in the A I and II only
2H2O + O2 + 4e I dan II sahaja
anode. B II and III only
Gas oksigen dihasilkan di anod.
15 Which of the following are the factors II dan III sahaja
that determine the type of ions to be C II and IV only
13 Diagram 3 shows an apparatus set- II dan IV sahaja
up for an electrolysis process. discharged at the electrodes?
Antara yang berikut, manakah ialah faktor D I and IV only
Rajah 3 menunjukkan susunan radas bagi
yang menentukan jenis ion yang dinyahcas di I dan IV sahaja
satu proses elektrolisis.
elektrod?
I Type of electrode used.
Jenis elektrod yang diguna.
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di sini TOPICAL TEST 6: ELECTROCHEMISTRY
UJIAN TOPIKAL 6: ELEKTROKIMIA
PAPER 1 KERTAS 1
17 Information below shows the main B Change aqueous nickel nitrate to Besi Kuprum
aim of process X. concentrated nickel nitrate
Maklumat di bawah menunjukkan tujuan solution.
utama bagi proses X. Tukarkan akueus nikel nitrat kepada 22 Diagram 7 shows the set-up of the
● Prevent corrosion. larutan nikel nitrat pekat.
apparatus of a simple voltaic cell.
Mencegah kakisan C Replace the nickel electrode with Rajah 7 menunjukkan susunan radas bagi
● Improve the appearance. the carbon electrode. satu sel voltan ringkas.
Memperbaiki rupa luaran. Gantikan elektrod nikel dengan elektrod
karbon.
What is process X? D Change the spoon to an iron key.
Apakah proses X? Tukarkan sudu kepada kunci besi.
A Electrolysis C Electroplating
Elektrolisis Penyaduran
20 Which of the following shows the
B Extraction D Wrapping
Pengekstrakan Pembalutan equations that takes place in anode
18 Which of the following is true about and cathode during the purification
electroplating an iron key with of impure copper?
Antara yang berikut, manakah menunjukkan
copper? persamaan yang mengambil bahagian di
Antara yang berikut, manakah benar tentang anod dan katod semasa penulenan kuprum
penyaduran kunci besi dengan kuprum? tidak tulen? Diagram 7 Rajah 7
Anode Cathode Electrolyte Which of the following is true about
Anod Katod solution Anode Cathode the voltaic cell?
Larutan Anod Katod Antara yang berikut, manakah benar tentang
elektrolit sel voltan?
A Cu2+ + 2e → Cu Cu → Cu2+ + 2e
A Copper AgNO3 I The copper plate dissolves
Iron key gradually.
Kunci besi rod solution B Cu → Cu2+ + 2e Cu2+ + 2e → Cu
Rod kuprum Larutan AgNO3 Kepingan kuprum terlarut sedikit demi
sedikit.
B Copper AgNO3 C –
2H+ + 2e → H2 4OH → II The zinc plate acts as negative
Iron key 2H2O + O2 + 4e terminal.
rod Kunci besi solution
Rod kuprum Larutan AgNO3 Kepingan zink bertindak sebagai terminal
D 4OH– → 2H+ + 2e → H2 negatif.
2H2O + O2 + 4e III The zinc plate become thinner.
C Copper CuSO4
Iron key Kepingan zink menjadi nipis.
Kunci besi rod solution IV Electrons flow from zinc plate to
Rod kuprum Larutan CuSO4 21 Diagram 6 shows the set-up of the
apparatus of a simple chemical cell. copper plate.
Rajah 6 menunjukkan susunan radas bagi Elekron mengalir dari kepingan zink ke
D Copper CuSO4 kepingan kuprum.
Iron key satu sel kimia ringkas.
rod Kunci besi solution A I, II and III only
Rod kuprum Larutan CuSO4 I, II dan III sahaja
B I, II and IV only
I, II dan IV sahaja
19 Diagram 5 shows the set-up of the C I, III and IV only
apparatus used in an experiment. I, III dan IV sahaja
Rajah 5 menunjukkan susunan radas yang D II, III and IV only
digunakan dalam satu eksperimen. II, III dan IV sahaja
23 Diagram 8 shows the set-up of the
apparatus of a certain voltaic cell.
Diagram 6 Rajah 6 Rajah 8 menunjukkan susunan radas bagi
What are metals P and Q? satu sel voltan tertentu.
Apakah logam P dan Q?
Metal P Metal Q
Logam P Logam Q
A Lead Magnesium
Plumbum Magnesium
Diagram 5 Rajah 5
What change would you make so B Zinc Aluminium
that the experiment is successful? Zink Aluminium
Apakah perubahan yang anda perlu buat
supaya eksperimen ini berjaya?
C Magnesium Copper
A The terminal of the batteries are Magnesium Kuprum
reversed.
Terbalikkan terminal bateri. Diagram 8 Rajah 8
D Iron Copper
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di sini TOPICAL TEST 6: ELECTROCHEMISTRY
UJIAN TOPIKAL 6: ELEKTROKIMIA
PAPER 1 KERTAS 1
Which of the following changes can Apakah sel X? Celupkan cincin dalam minyak.
increase the reading on the A Daniell cell C Alkaline cell B Wash the ring with soap.
Sel Daniell Sel alkali Cucikan cincin dengan sabun.
voltmeter?
Antara perubahan yang berikut, manakah B Mercury cell D Nickel cell C Plate the ring with gold.
boleh menaikkan bacaan voltmeter? Sel merkuri Sel nikel Sadurkan cincin dengan emas.
A Use a more concentrated sodium D Polished the ring with water.
26 Diagram 9 shows a chemical cell. Gilapkan cincin dengan air.
chloride.
Gunakan larutan natrium klorida yang Rajah 9 menunjukkan satu sel kimia.
lebih pekat. 29 Diagram 10 shows a chemical cell.
B Change the zinc plate to Rajah 10 menunjukkan satu sel kimia.
magnesium plate.
Tukarkan kepingan zink kepada kepingan
magnesium.
C Change the copper plate to ledd
plate.
Tukarkan kepingan kuprum kepada
kepingan plumbum.
D Increase the volume of aqueous
sodium chloride.
Tambahkan isi padu akueus natrium
klorida.
Diagram 10 Rajah 10
24 Which of the following is correct Diagram 9 Rajah 9 Which of the following can get the
between an electrolytic cell and What is the correct chemical highest reading on the voltmeter?
voltaic cell? reaction that takes place in the Antara yang berikut, manakah boleh
Antara yang berikut, manakah betul bagi sel memperoleh bacaan voltmeter yang paling
elektrolisis dan sel voltan? positive terminal of the chemical tinggi?
I Cathode is the negative terminal cell?
Apakah tindak balas kimia yang betul yang Plat X Plat Y
in voltaic cell. mengambil bahagian di terminal positif Kepingan X Kepingan Y
Katod ialah terminal negatif dalam sel dalam sel kimia?
voltan.
A Zn2+ + 2e → Zn A Zinc Magnesium
Zink Magnesium
B Zn → Zn2+ + 2e
II Electrons flow from anode to the
C Ag+ + e → Ag B Zinc Copper
cathode in electrolytic cell.
Elektron mengalir dari anod ke katod D Ag → Ag+ + e Zink Kuprum
dalam sel elektrolisis.
C Magnesium Copper
III Anion is attracted to the anode in Magnesium Kuprum
the electrolytic cell.
Anion tertarik ke anod dalam sel 27 Which of the following is true about D Magnesium Silver
elektrolisis. Magnesium Argentum
the advantages of the dry cell?
IV Graphite is not use as electrodes Antara yang berikut, manakah benar tentang
in the voltaic cell. kelebihan sel kering?
Grafit tidak digunakan sebagai elektrod I Cheap
dalam sel voltan. Murah
A I, II and III only II Easy to be carried
I, II dan III sahaja Mudah dibawa 30 Table 1 shows the information about
B I, II and IV only III Can be recharged three simple cells.
I, II dan IV sahaja Boleh dicas semula Jadual 1 menunjukkan maklumat tentang tiga
C I, III and IV only IV Available in different size sel ringkas.
I, III dan IV sahaja Terdapat pelbagai saiz
Metal Potential Positive
D II, III and IV only A I, II and III only
II, III dan IV sahaja pairs difference (V) terminal
I, II dan III sahaja
Pasangan Beza keupayaan Terminal
B I, II and IV only logam (V) positif
25 Information below shows the I, II dan IV sahaja
description of cell X. C I, III and IV only
Maklumat di bawah menunjukkan huraian I, III dan IV sahaja P and Q 1.3 P
tentang sel X. D II, III and IV only P dan Q
II, III dan IV sahaja
● Portable P and R
Mudah alih 2.1 P
P dan R
● Stable voltage 28 Jane wants to make her ring more
Voltan stabil beautiful and prevent corrosion. R and S
● Not rechargeable 1.8 R
What is the best way to achieve this? R dan S
Tidak boleh dicas semula Jane hendak menjadikan cincinnya kelihatan
● Costs more than dry cell lebih cantik dan tahan kakisan. Apakah cara Table 1 Jadual 1
Lebih mahal daripada sel kering terbaik untuk mendapat kesan ini?
What is the potential difference of
A Dip the ring in oil.
What is cell X? the metal pair Q and S?
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di sini TOPICAL TEST 6: ELECTROCHEMISTRY
UJIAN TOPIKAL 6: ELEKTROKIMIA
PAPER 1 KERTAS 1
Apakah perbezaan voltan bagi pasangan Diagram 12 Rajah 12 A Z, Y and X
logam Q dan S? Z, Y dan X
Which of the following can give the
A 0.5 V C 1.8 V B Y, X and Z
highest reading on the voltmeter?
B 0.9 V D 2.6 V Antara yang berikut, manakah boleh Y, X dan Z
menghasilkan bacaan voltan yang paling C X, Y and Z
31 Diagram 11 shows the metal P is tinggi? X, Y dan Z
dropped into copper (II) sulphate D X, Z and Y
Electrode P Electrode Q X, Z dan Y
solution. Elektrod P Elektrod Q
Rajah 11 menunjukkan logam P diletak ke
dalam larutan kuprum (II) sulfat. A Iron Lead 34 The arrangement of metals in the
Besi Plumbum electrochemical series is based on
Susunan logam dalam siri elektrokimia
B Silver Copper adalah berdasarkan
Argentum Kuprum A their melting points.
takat lebur.
C Copper Aluminium B the nucleon number.
Kuprum Aluminium nombor nukleon.
C the tendency to be discharged.
D Silver Lead kecenderungan dinyahcas.
Diagram 11 Rajah 11 Argentum Plumbum
Which of the following metals can D the tendency to receive electrons.
kecenderungan menerima elektron.
cause faster decolourisation of the 33 Table 2 shows the information of
solution? two simple cells. 35 Which of the following is not the
Antara logam yang berikut, manakah boleh
melunturkan warna larutan dengan paling
Jadual 2 menunjukkan maklumat bagi dua sel example of electrochemical
ringkas. industries in our daily life?
cepat?
A Aluminium Antara yang berikut, manakah bukan contoh
perindustrian elektrokimia dalam kehidupan
Aluminium
Cell Electrode Potential Positive seharian kita?
B Zinc
Zink Sel Elektrod difference terminal A Voltaic cells are used in different
C Sodium (V) Terminal devices such as radio,
Perbezaan positif handphones, and others.
Natrium
voltan (V) Sel voltan digunakan dalam pelbagai
D Iron
peralatan seperti radio, telefon bimbit,
Besi
I X and Y 1.5 X dan lain-lain.
X dan Y B Electroplating of iron can prevent
32 Diagram 12 shows the electrolysis of
it from corrosion.
electrode P and Q. Y and Z Penyaduran besi boleh mencegah ia
Rajah 12 menunjukkan elekrolisis bagi
II 0.6 Z
Y dan Z daripada kakisan.
elektrod P dan Q.
C Chemical substance such as
chlorine is used to produce toxic
Table 2 Jadual 2
solution.
Which of the following is the Bahan kimia seperti klorin diguna untuk
ascending order of electrode X, Y menghasil larutan bertoksik.
and Z in the electrochemical series? D Extraction of useful metals such
Antara yang berikut, manakah ialah urutan as aluminium using electrolysis.
menaik bagi elektrod X, Y dan Z dalam siri
Pengestrakan logam berguna seperti
elektrokimia?
aluminium dengan elektrolisis.
PAPER 2 KERTAS 2
SECTION A BAHAGIAN A
1 Diagram 1 is the electrolysis of 0.001 mol dm –3
hydrochloric acid.
Rajah 1 ialah elektrolisis asid hidroklorik, 0.001 mol dm–3.
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UJIAN TOPIKAL 6: ELEKTROKIMIA
PAPER 1 KERTAS 1
Diagram 2 Rajah 2
(a) What is the correct terminal for R and S in this
experiment?
Diagram 1 Rajah 1 Apakah terminal yang betul bagi R dan S dalam eksperimen ini?
–3
_______________________________________________________
(a) Write all the ions that present in 0.001 mol dm [2 marks / 2 markah]
hydrochloric acid.
Tuliskan semua ion yang wujud dalam asid hidroklorik, 0.001 mol (b) What is the suitable electrolyte that can be used in this
dm–3.
________________________________________________________ experiment?
Apakah elektrolit yang sesuai digunakan dalam eksperimen ini?
[1 mark / 1 markah] ________________________________________________________
(b) What is the suitable plate that can be used in this [1 mark / 1 markah]
experiment? (c) Write the equation of reaction happened in the anode
Apakah kepingan yang sesuai digunakan dalam eksperimen ini?
________________________________________________________ and cathode.
Tuliskan persamaan tindak balas yang berlaku di anod dan katod.
[1 mark / 1 markah] ________________________________________________________
[2 marks / 2 markah]
(c) Write the half equation for the reaction that occurs in
anode and cathode. (d) What can be observed in the anode and cathode?
Tuliskan persamaan setengah bagi tindak balas yang berlaku di anod Apakah yang boleh diperhatikan di anod dan katod?
dan katod. ________________________________________________________
________________________________________________________
[2 marks / 2 markah]
[2 marks / 2 markah]
(e) Name the process of this experiment and write the aim
(d) Name the gases X and Y.
Namakan gas X dan Y. of this experiment.
________________________________________________________ Namakan proses bagi eksperimen ini dan tuliskan tujuan eksperimen.
________________________________________________________
[2 marks / 2 markah]
[3 marks / 3 markah]
(e) The experiment is repeated by changing the 0.001 mol
3 Diagram 3 shows a voltaic cell.
dm–3 hydrochloric acid to a more concentrated Rajah 3 menunjukkan satu sel voltan.
hydrochloric acid.
Eksperimen diulang dengan menukarkan asid hidroklorik.
0.001 mol dm–3 kepada asid hidroklorik yang lebih pekat.
(i) What is the gas that will be collected in the anode?
Apakah gas yang akan dikumpul di anod?
[1 mark / 1 markah]
(ii) Explain why this gas produced in the anode.
Jelaskan mengapa gas ini dihasilkan di anod.
___________________________________________________
[1 mark / 1 markah]
(iii) Write the half equation that occur in the anode.
Tuliskan persamaan setengah yang berlaku di anod.
___________________________________________________ Diagram 3 Rajah 3
[1 mark / 1 markah]
(a) Which electrode is the anode and cathode of the cell?
Elektrod yang manakah ialah anod dan katod dalam sel ini?
_______________________________________________________
2 Diagram 2 shows the setup of apparatus to purify a key. [1 mark / 1 markah]
Rajah 2 menunjukkan susunan radas untuk menulenkan sebatang kunci.
(b) What is a salt bridge and its function in this experiment?
Apakah titian garam dan fungsinya dalam eksperimen ini?
________________________________________________________
[2 marks / 2 markah]
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UJIAN TOPIKAL 6: ELEKTROKIMIA
PAPER 1 KERTAS 1
(c) What can be observed on the zinc electrode and why? Diagram 4 Rajah 4
Apakah yang boleh diperhatikan pada elektrod zink dan mengapa? (a) How is the flow of electrons in this experiment?
________________________________________________________ Bagaimanakah pengaliran elektron dalam eksperimen ini?
[2 marks / 2 markah] _______________________________________________________
(d) Write an equation for the reaction that takes place in [1 mark / 1 markah]
zinc and iron electrode.
Tuliskan persamaan bagi tindak balas yang mengambil bahagian di (b) Write three observations from this experiment.
elektrod zink dan besi. Tuliskan tiga pemerhatian daripada eksperimen ini.
________________________________________________________ ________________________________________________________
[2 marks / 2 markah] [3 marks / 3 markah]
(e) What is the conversion energy that takes place in the (c) Write the equations that happened in the zinc and
cell? copper plate.
Apakah perubahan tenaga yang berlaku dalam sel? Tuliskan persamaan yang berlaku dalam kepingan zink dan kepingan
________________________________________________________ kuprum.
[1 mark / 1 markah] ________________________________________________________
[2 marks / 2 markah]
(f) What will happen to the cell voltage if iron electrode is
replaced by silver electrode? (d) Write an overall equation of this experiment.
Tuliskan satu persamaan keseluruhan bagi eksperimen ini.
Apakah yang akan terjadi terhadap voltan sel jika elektrod besi
________________________________________________________
digantikan dengan elektrod argentum?
________________________________________________________ [1 mark / 1 markah]
[1 mark / 1 markah]
(e) What will happen if zinc plate is replaced by
4 Diagram 4 shows a cell made by zinc and copper plates. magnesium plate? Why?
Rajah 4 menunjukkan satu sel yang diperbuat daripada kepingan zink dan Apakah yang akan terjadi jika kepingan zink diganti dengan kepingan
kepingan kuprum. magnesium? Mengapa?
________________________________________________________
[2 marks / 2 markah]
SECTION B BAHAGIAN B
5 (a) What is electrolysis? Lukis satu rajah dengan label untuk menunjukkan elektrolisis
Apakah elektrolisis? larutan akueus kuprum (II) klorida.
[1 mark / 1 markah] [5 marks / 5 markah]
(b) Explain and give an example of the following terms. (d) Explain by giving chemical equation and the
Jelas dan beri satu contoh bagi istilah yang berikut. observation from this diagram.
Jelaskan dengan memberi persamaan kimia dan pemerhatian
(i) Electrolyte. daripada rajah itu.
Elektrolit.
[7 marks / 7 markah]
[4 marks / 4 markah]
(e) List three factors that determine the type of ions to be
(ii) Non-electrolyte
Bukan elektrolit. discharged at the electrodes.
Senaraikan tiga faktor yang menentukan jenis ion yang dinyahcas
[5 marks / 5 markah] pada elektrod.
(c) Draw a labelled diagram to show the electrolysis of an [3 marks / 3 markah]
aqueous copper (II) chloride solution.
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UJIAN TOPIKAL 6: ELEKTROKIMIA
PAPER 1 KERTAS 1
SECTION C BAHAGIAN C
6 Diagram 5 shows the arrangement of particles in lead (II) (c) Why lead (II) chloride only conducts electricity in state
chloride. B but not state A?
Rajah 5 menunjukkan susunan zarah dalam plumbum (II) klorida. Mengapakah plumbum (II) klorida hanya mengalirkan elektrik dalam
keadaan B tetapi bukan keadaan A?
[4 marks / 4 markah]
(d) Draw a labelled diagram of apparatus in the electrolysis
Diagram 5 Rajah 5 of molten lead (II) chloride.
Lukis satu rajah dengan label bagi susunan radas dalam elektrolisis
(a) What is the state of lead (II) chloride in A and B? leburan plumbum (II) klorida.
Apakah keadaan bagi plumbum (II) klorida dalam A dan B?
[6 marks / 6 markah]
[2 marks / 2 markah]
(e) Describe the electrolysis process that occurs in molten
(b) How to convert lead (II) chloride from state A to B?
Bagaimanakah menukar keadaan plumbum (II) klorida keadaan A ke
lead (II) chloride.
B? Huraikan proses elektrolisis yang berlaku dalam leburan plumbum
(II) klorida.
[1 mark / 1 markah]
[7 marks / 7 markah]
SECTION A BAHAGIAN A
PAPER 3 KERTAS 3
1 An experiment was carried out using copper metal as
positive electrode and copper (II) sulphate solution as
electrolyte. Diagram 1.1 shows the apparatus set-up for an
experiment of chemical cell to measure the potential
difference between electrode copper metal and iron metal.
The experiment was repeated with magnesium metal and
aluminium to replace the iron metal.
Satu eksperimen dijalankan dengan menggunakan logam kuprum sebagai
elektrod positif dan larutan kuprum (II) sulfat sebagai elektrolit. Rajah 1.1
menunjukkan susunan radas sel kimia untuk mengukur beza keupayaan di
antara elektrod logam kuprum dan logam ferum. Eksperimen diulangi
dengan menggantikan logam besi dengan logam magnesium dan
aluminium.
Diagram 1.1 Rajah 1.1
Diagram 1.2 shows the potential difference of three voltmeters A, B and C for different pairs of metals.
Rajah 1.2 menunjukkan tiga bacaan voltmeter A, B and C bagi pasangan-pasangan logam yang berbeza.
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UJIAN TOPIKAL 6: ELEKTROKIMIA
PAPER 1 KERTAS 1
Diagram 1.2 Rajah 1.2
(a) Record the potential difference for the pairs of metal in [3 marks / 3 markah]
the spaces provided in Diagram 1.2.
Catatkan beza keupayaan bagi pasangan-pasangan logam dalam (h) Besides the changes in electrode, state other observation
ruang yang disediakan di Rajah 1.2. of this experiment.
[3 marks / 3 markah] Selain daripada perubahan di elektrod, nyatakan pemerhatian bagi
eksperimen ini.
(b) Construct a table using the data for this experiment. [3 marks / 3 markah]
Your table should include pairs of metals and potential
difference. (i) State the energy changes involved in this chemical cell.
Binakan satu jadual dengan menggunakan maklumat daripada Nyatakan perubahan tenaga yang terlibat dalam sel kimia ini.
eksperimen ini. Jadual anda haruslah mengandungi pasangan logam [3 marks / 3 markah]
dan beza keupayaan.
[3 marks / 3 markah] (j) Write one conclusion for this experiment.
Tuliskan satu kesimpulan bagi eksperimen ini.
(c) State the hypothesis of the experiment. [3 marks / 3 markah]
Nyatakan hipotesis bagi eksperimen ini.
[3 marks / 3 markah]
(d) State the variables following: 2 Electroplating is a process of coating a thin protective layer
Nyatakan pemboleh ubah berikut:
(i) Manipulated variable: to the metals that easily corrode. This process is highly used
Pemboleh ubah dimanipulasikan: in manufacturing artificial jewellery.
Penyaduran elektrik merupakan proses penyalutan satu lapisan pelindung
(ii) Responding variable: yang nipis ke atas logam-logam yang mudah terkakis. Proses ini banyak
Pemboleh ubah bergerak balas:
digunakan dalam pembuatan permata tiruan.
(iii) Constant variable:
Pemboleh ubah dimalarkan:
[3 marks / 3 markah] Plan an experiment to study how to electroplate iron metal
with gold.
(e) (i) What could be observed in iron electrode? Rancangkan satu eksperimen untuk mengkaji bagaimana untuk
Apakah yang boleh diperhatikan pada elektrod ferum? menyadurkan logam ferum dengan emas.
[3 marks / 3 markah]
(ii) Explain your answer in (d) (i). Your planning should include the following aspects:
Terangkan jawapan anda di (d) (i). Rancangan anda hendaklah mengandungi aspek-aspek berikut:
[3 marks / 3 markah] (a) Aim of experiment.
Tujuan eksperimen.
(f) Arrange Cu, Fe, Mg and Al metals ascending order in
the electrochemical series. (b) Statement of hypothesis.
Pernyataan hipotesis.
Susunkan keempat-empat logam, Cu, Fe, Mg dan Al dalam siri
elektrokimia mengikut tertib menaik. (c) List of materials and apparatus.
[3 marks / 3 markah] Senarai bahan dan radas.
(g) Metal K is less electropositive than magnesium and (d) Diagram for apparatus set-up.
Rajah bagi susunan radas.
aluminium but more electropositive than copper and
(e) Procedure of experiment.
iron. State where is the metal K located. Prosedur eksperimen.
Logam K kurang elektropositif daripada magnesium dan aluminium
tetapi lebih elektropositif daripada kuprum dan ferum. Nyatakan di (f) Tabulation of data.
mana letaknya logam K. Penjadualan data.
[17 marks / 17 markah]
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UJIAN TOPIKAL 6: ELEKTROKIMIA
PAPER 1 KERTAS 1
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