Chemistry form 4 topical question 6

  • 3,314 views
Uploaded on

 

More in: Education
  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Be the first to comment
No Downloads

Views

Total Views
3,314
On Slideshare
0
From Embeds
0
Number of Embeds
0

Actions

Shares
Downloads
272
Comments
0
Likes
2

Embeds 0

No embeds

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
    No notes for slide

Transcript

  • 1. SULIT NAMA: _______________________________________________ TINGKATAN: ______________ Lekat logo sekolah 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.© Navision (M) Sdn. Bhd. (690640-P) 41 SULIT
  • 2. SULIT NAMA: _______________________________________________ TINGKATAN: ______________ Lekat logo sekolah 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 only13 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.© Navision (M) Sdn. Bhd. (690640-P) 42 SULIT
  • 3. SULIT NAMA: _______________________________________________ TINGKATAN: ______________ Lekat logo sekolah di sini TOPICAL TEST 6: ELECTROCHEMISTRY UJIAN TOPIKAL 6: ELEKTROKIMIA PAPER 1 KERTAS 117 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 anode18 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 sahaja19 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© Navision (M) Sdn. Bhd. (690640-P) 43 SULIT
  • 4. SULIT NAMA: _______________________________________________ TINGKATAN: ______________ Lekat logo sekolah 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 1024 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) positif25 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?© Navision (M) Sdn. Bhd. (690640-P) 44 SULIT
  • 5. SULIT NAMA: _______________________________________________ TINGKATAN: ______________ Lekat logo sekolah 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 Z31 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 prevent32 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.© Navision (M) Sdn. Bhd. (690640-P) 45 SULIT
  • 6. SULIT NAMA: _______________________________________________ TINGKATAN: ______________ Lekat logo sekolah di sini TOPICAL TEST 6: ELECTROCHEMISTRY 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]© Navision (M) Sdn. Bhd. (690640-P) 46 SULIT
  • 7. SULIT NAMA: _______________________________________________ TINGKATAN: ______________ Lekat logo sekolah di sini TOPICAL TEST 6: ELECTROCHEMISTRY 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 B5 (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.© Navision (M) Sdn. Bhd. (690640-P) 47 SULIT
  • 8. SULIT NAMA: _______________________________________________ TINGKATAN: ______________ Lekat logo sekolah di sini TOPICAL TEST 6: ELECTROCHEMISTRY 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 1.1Diagram 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.© Navision (M) Sdn. Bhd. (690640-P) 48 SULIT
  • 9. SULIT NAMA: _______________________________________________ TINGKATAN: ______________ Lekat logo sekolah di sini TOPICAL TEST 6: ELECTROCHEMISTRY 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]© Navision (M) Sdn. Bhd. (690640-P) 49 SULIT
  • 10. SULIT NAMA: _______________________________________________ TINGKATAN: ______________ Lekat logo sekolah di sini TOPICAL TEST 6: ELECTROCHEMISTRY UJIAN TOPIKAL 6: ELEKTROKIMIA PAPER 1 KERTAS 1© Navision (M) Sdn. Bhd. (690640-P) 50 SULIT