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SECTION A BAHAGIAN A [ 40 marks / 40 markah ] Answer all questions from this section. Jawab semua soalan dalam bahagian ini. ANSWERS JAWAPAN 1

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[ ______ x 2 = ________ ]

1.

Diagram 1 shows the production of sulphuric acid by the Contact process. Rajah 1 menunjukkan penghasilan asid sulfurik dengan proses Sentuh.

Diagram 1 / Rajah 1 What is the substance Q? Apakah bahan Q? A B C D

Vanadium (V) oxide, V2O5 Vanadium (V) oksida, V2O5 Sulphur trioxide, SO3 Sulfur trioksida, SO3 Oleum, H2S2O9 Oleum, H2S2O9 Oleum, H2S2O7 Oleum, H2S2O7

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2.

Calculate the percentage of nitrogen by mass in ammonium nitrate, NH4NO3. [Relative atomic mass: N, 14; H,1; O, 16] Hitungkan peratusan jisim nitrogen dalam ammonium nitrat, NH4NO3. [Jisim atom relatif: N, 14; H, 1; O, 16] A B C D

3.

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28.2% 35% 46% 52.5%

Given that substance P can be represented by the following formula: Diberi bahawa bahan P boleh diwakili oleh formula yang berikut:

Which of the following represents the monomer of substance P? Antara yang berikut, manakah mewakili monomer bahan P? A

B

C

D

4.

Why a boat which is made from fibre glass is better than steel? Mengapakah sebuah kapal yang diperbuat daripada gentian kaca adalah lebih baik daripada keluli? A B C D

Heavier. Lebih berat. More resilient and flexible. Lebih tahan dan fleksibel. Lower tensile strength. Kekuatan tegangan yang lebih rendah. More soft and weak. Lebih lembut dan lemah

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Low melting point (7000C). Takat lebur rendah (7000C). Cracks easily with sudden temperature changes. Mudah retak dengan perubahan suhu yang tiba-tiba. Easy to mould and shape. Mudah diacu dan dibentuk. Which of the following types of glass shows the above properties? Antara jenis kaca yang berikut, manakah menunjukkan sifat-sifat di atas? A

Fused silica glass Kaca silika terlakur

B

Soda-lime glass Kaca soda kapur

C

Borosilicate glass Kaca borosilikat

D

Lead crystal glass Kaca plumbum

6. The table below shows the results obtained when a solution containing unknown salt X is tested with two reagents. Jadual di bawah menunjukkan keputusan yang diperolehi apabila suatu larutan yang mengandungi garam X diuji dengan dua bahan reagen. Reagent Reagen Sodium hydroxide Natrium hidroksida

Result Keputusan Green precipitate Mendakan hijau

Dilute nitric acid followed by silver nitrate Asid nitrik cair diikuti argentum nitrat

White precipitate Mendakah putih

Which of the following is X? Antara berikut yang manakah X? A B C D

FeCl2 FeSO4 CuCl2 CuSO4

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7.

Which of the following react to form a salt and water only? Antara yang berikut yang manakah bertindak balas menghasilkan garam dan air sahaja? A B C D

8.

Iron powder and nitric acid. Serbuk besi dan asid nitrik. Aqueous barium chloride and aqueous sodium sulphate. Akueus barium klorida dan akueus natrium sulfat. Aqueous potassium hydroxide and aqueous ethanoic acid. Akueus kalium hidroksida dan akueus asid etanoik. Aqueous sodium carbonate and aqueous hydrochloric acid. Akueus natrium karbonat dan akuesu asid hidroklorik.

Two aqueous solutions X and Y are mixed. Which of the following pairs will not form a precipitate? Dua larutan akueus X dan Y dicampurkan. Antara pasangan berikut yang manakah tidak akan membentuk mendakan?

A B C D

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X Magnesium chloride Magnesium klorida Barium chloride Barium klorida Potassium nitrate Kalium nitrat

Y Silver sulphate Kalium sulfat Sodium sulphate Natrium sulfat Sodium iodide Natrium iodide

Zinc nitrate Zink nitrat

Potassium carbonate Kalium karbonat

Tests on a polluted water from a factory yield the following result: Hasil ujian terhadap air yang tercemar daripada kilang ditunjukkan seperti berikut: Test Ujian Calcium carbonate Kalsium karbonat Acidified barium nitrate Barium nitrat berasid

Result Keputusan Gas turns lime water cloudy Gas mengeruhkan air kapur White precipitate Mendakan putih

What could be present in the polluted water? Apakah yang berkemungkinan hadir dalam air yang telah tercemar itu? A B C D

Chromium (III) sulphate / Kromium(III) sulfat Hydrochloric acid / Asid hidroklorik Lead(II) nitrate / Plumbum(II) nitrat Sulphuric acid / Asid sulfurik

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10. Explosions can occur in coal mines because Letupan boleh berlaku dalam lombong arang batu kerana A B C D

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the temperature in the coal mine is higher than outside. suhu di dalam lombong arang batu lebih tinggi berbanding di luar. the concentration of oxygen in the coal mine is high kepekatan oksigen di dalam lombong arang batu tinggi the ventilation in the coal mine is very good pengudaraan di dalam lombong arang batu baik the coal dust is very fine. debu arang batu sangat halus

Curve 1 is obtained when 1 g of marble chips reacted with excess hydrochloric acid at 30oC. Lengkung 1 diperolehi apabila 1 g ketulan marmar bertindak balas dengas asid hidroklorik berlebihan pada 30oC.

Which of the following changes will result in curve 2? Antara perubahan berikut yang manakah akan memberikan lengkung 2? A Adding water to dilute acid Menambah air kepada asid cair B Using 0.5 g of marble chips Menggunakan 0.5 g ketulan marmar C Warming the acid to 40oC Memanaskan asid ke 40oC D Using 1 g of powdered marble Menggunakan serbuk marmar

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Two experiments are carried out by adding hydrochloric acid to sodium thiosulphate solution. Dua eksperimen dijalankan dengan menambah asid hidroklorik ke dalam larutan natrium thiosulfat. Experiment I : Eksperimen 1:

Experiment II: Eksperimen I1:

5 cm3 of 2.0 mol dm-3 hydrochloric acid is added into 50 cm3 of 0.2 mol dm-3 sodium thiosulphate solution. 5 cm3 asid hidroklorik 2.0 mol dm-3 ditambah ke dalam 50 cm3 larutan natrium thiosulfat 0.2 mol dm-3. 10 cm3 of 1.0 mol dm-3 hydrochloric acid is added into 25 cm3 of 0.4 mol dm-3 sodium thiosulphate solution. 10 cm3 asid hidroklorik 1.0 mol dm-3 ditambah ke dalam 25 cm3 larutan natrium thiosulfat 0.4 mol dm-3.

What is the initial rate of reaction and the total mass of sulphur formed for each experiment? Apakah kadar awal tindak balas dan jumlah jisim sulfur yang terbentuk dalam setiap eksperimen?

A B C D

Initial rate of reaction Kadar awal tindak balas Lower in I Rendah dalam I Higher in I Tinggi dalam I Lower in I Rendah dalam I Higher in I Tinggi dalam I

Total mass of sulphur formed Jumlah jisim sulfur terbentuk Higher quantity in I Kuantiti lebih tinggi dalam I Higher quantity in II Kuantiti lebih tinggi dalam II Same quantity in I and II Kuantiti sama dalam I dan II Same quantity in I and II Kuantiti sama dalam I dan II

13. The diagram below shows the energy profile of a chemical reaction. Which of the following represents the activation energy with the presence of catalyst? Rajah di bawah menunjukkan gambarajah aras tenaga bagi satu tindak balas kimia. Antara yang berikut, yang manakah mewakili tenaga pengaktifan dengan kehadiran mangkin?

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Two experiments are carried out to study the catalytic decomposition of hydrogen peroxide using MnO2 as catalyst. Dua eksperimen dijalankan untuk mengkaji penguraian katalitik hidrogen peroksida menggunakan MnO2 sebagai mangkin. Experiment Eksperimen

Mass of MnO2 Jisim MnO2

I

0.5 g

II

0.5 g

Hydrogen peroxide solution used Larutan hidrogen peroksida yang digunakan 3 50 cm of 0.5 mol dm-3 H2O2 50 cm3 H2O2 0.5 mol dm-3 100 cm3 of 0.4 mol dm-3 H2O2 100 cm3 H2O2 0.4 mol dm-3

Which of the following graphs of total volume of oxygen (V) against time (t) shows the result for both experiments? Antara graf jumlah isipadu oksigen (V) melawan masa (t) berikut yang manakah menunjukkan keputusan bagi kedua-dua eksperimen? A

C

B

D

15. Which of the following best explains why the increase of temperature by 10oC doubles the rate of a chemical reaction? Antara berikut yang manakah memberikan penerangan terbaik mengenai kenaikan suhu sebanyak 10oC akan mengganda duakan kadar tindak balas kimia? A The kinetic energy of particles increases. Tenaga kinetik zarah meningkat. B More particles have energy exceeding the activation energy. Lebih banyak zarah yang mempunyai tenaga melebihi tenaga pengaktifan. C The activation energy is lowered when temperature is increased. Tenaga pengaktifan menjadi semakin rendah apabila suhu meningkat. D The frequency of collisions increases with increased in temperature. Kekerapan pelanggaran meningkat dengan peningkatan suhu.

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16.

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Potato can be cooked faster by Kentang boleh dimasak dengan lebih cepat dengan I soaking it in salt solution before cooking it merendamnya dalam larutan garam sebelum ia dimasak. II cooking it in oil instead of boiling it in water memasaknya dalam minyak daripada mendidihkannya dalam air III increasing the volume of water in the pot menambahkan isipadu air dalam periuk. IV slicing it thin before cooking. menghirisnya dengan nipis sebelum dimasak. A I and III I dan III B II and IV II dan IV C I, II and III I, II dan III D II, III and IV II, III dan IV

17. The rate of rusting of iron nail is slower at a high altitude than at sea level. This is because at high altitude Kadar pengaratan paku besi lebih rendah pada altitud tinggi berbanding pada aras laut. Ini kerana pada altitud tinggi the concentration of oxygen is lower. kepekatan oksigen lebih rendah. II the concentration of carbon dioxide is lower. kepekatan karbon dioksida lebih rendah. III the temperature of the surrounding is lower. suhu persekitaran lebih rendah. IV the water vapour in the atmosphere is lower. wap air di atmosfera lebih rendah. I

A B C D

I and III I dan III I, II and III I, II dan III I, III and IV I, III dan IV II, III and IV II, III dan IV

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Which of the following reactions occurs at the lowest rate? Antara tindak balas yang berikut yang manakah berlaku pada kadar yang paling rendah? A Fermentation of glucose to ethanol. Penapaian glukosa kepada etanol. B Neutralisation between hydrochloric acid and sodium hydroxide. Peneutralan antara asid hidroklorik dan natrium hidroksida. C Displacement of copper from copper(II) sulphate solution by zinc metal. Penyesaran kuprum daripada larutan kuprum(II) sulfat dengan logam zink. D Precipitation of silver chloride by adding silver nitrate into sodium chloride solution. Pemendakan argentum klorida melalui penambahan argentum nitrat ke dalam larutan natrium klorida.

19. Which of the following properties of a catalyst will not change during the reaction? Antara sifat-sifat mangkin berikut yang manakah tidak akan berubah semasa tindak balas? A Appearance / permukaan B surface area / luas permukaan C physical state / keadaan fizik D chemical composition / komposisi kimia 20.

The table below shows the result obtained from the decomposition of hydrogen peroxide. Jadual di bawah menunjukkan keputusan yang diperolehi daripada penguraian hidrogen peroksida. Time/minute Masa / minit Volume of O2 gas/cm3 Isipadu gas O2 /cm3

0 1

2

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0 4

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Calculate the average rate of decomposition of hydrogen peroxide. Hitungkan purata kadar penguraian hidrogen peroksida. A B C D

2.0 cm3 min-1 3.0 cm3 min-1 6.0 cm3 min-1 12.0 cm3 min-1

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SECTION B (STRUCTURED QUESTIONS ) BAHAGIAN B (SOALAN STRUKTUR) (40 marks / 40 markah ) Answer all questions from this section. Jawab semua soalan dalam bahagian ini. 1. A solid X is placed into a test tube. Then dilute hydrochloric acid is added. Effervescence occurs and the gas Y evolves and gives a 'pop' sound when tested with a burning splint. The mixture is then filtered. To a portion of the filtrate, sodium hydroxide solution is added until excess. A white precipitate Q is formed. The precipitate does not dissolve in excess sodium hydroxide solution. Pepejal X diletakkan ke dalam satu tabung uji. Kemudian, asid hidroklorik cair ditambah. Pembuakan berlaku dan gas Y dibebaskan dan memberikan bunyi 'pop' apabila diuji dengan kayu uji berbara. Campuran kemudiannya dituras. Hasil turasan ditambah dengan larutan natrium hidroksida sehingga berlebihan. Mendakan putih Q terbentuk. Mendakan itu tidak larut dalam larutan natrium hidroksida berlebihan (a) Identify Kenalpasti (i)

solid X pepejal X

[1 mark / 1 markah] (ii)

gas Y gas Y

[1 mark / 1 markah]

(b) Write an equation for the reaction between solid X and dilute nitric acid. Tulis persamaan bagi tindak balas antara pepejal X dan asid nitrik cair.

[2 marks /2 markah]

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(c) (i)

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Name the white precipitate Q. Namakan mendakan putih Q.

[1 mark /1 markah] (ii) Write an ionic equation for the formation of Q. Tulis persamaan ionik bagi pembentukan Q.

[1 mark /1 markah] (d) Some solid X is added into copper(II) sulphate solution. Beberapa pepejal X ditambah ke dalam larutan kuprum(II) sulfat. (i)

Write the equation of the reaction that takes place. Tulis persamaan bagi tindak balas yang berlaku.

[2 marks / 2 markah] (ii) State two observations of this reaction. Nyatakan dua pemerhatian bagi tindak balas itu.

[2 marks / 2 markah] 2.

Two experiments are carried out separately: Dua eksperimen dijalankan secara berasingan: Experiment I: Eksperimen I:

Experiment II: Eksperimen II:

10 g of marble chips (excess) was added into 100 cm3 of hydrochloric acid with concentration X mol dm-3. 10 g ketulan marmar (berlebihan) ditambah ke dalam 100 cm3 asid hidroklorik dengan kepekatan X mol dm-3. 10 g of marble chips (excess) was added into 100 cm3 of hydrochloric acid with concentration Y mol dm-3. 10 g ketulan marmar (berlebihan) ditambah ke dalam 100 cm3 asid hidroklorik dengan kepekatan Y mol dm-3.

Both experiments are carried out at room temperature and pressure. The graphs of volume of carbon dioxide gas against time for both experiments are as shown: Kedua-dua eksperimen dijalankan pada suhu dan tekanan bilik. Graf isipadu gas karbon dioksida melawan masa bagi kedua-dua eksperimen ditunjukkan:

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(a) Which of the two experiments uses hydrochloric acid solution of lower concentration? Explain your answer. Antara dua eksperimen tersebut yang manakah menggunakan larutan asid hidroklorik pada kepekatan yang lebih rendah? Jelaskan jawapan anda.

[2 marks /2 markah] (b) Calculate the average rate of reaction for experiment I. Hitungkan purata kadar tindak balas bagi eksperimen I.

[1 mark /1 markah] (c) (i)

Calculate the number of mole of carbon dioxide gas collected in experiment II. (1 mole of gas occupies a volume of 24 dm3 at room temperature and pressure). Hitungkan bilangan mol gas karbon dioksida yang dikumpul dalam eksperimen II. (1 mol gas menempati isipadu 24 dm3 pada suhu dan tekanan bilik).

[1 mark /1 markah]

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(ii) Calculate the concentration of the acid used in experiment II. Hitungkan kepekatan asid yang digunakan dalam eksperimen II.

[3 marks] [3 markah] (d)

Suggest two other ways to increase the rate of reaction between the marble chips and the hydrochloric acid solutions. Cadangkan dua cara lain untuk meningkatkan kadar tindak balas antara ketulan marmar dan larutan asid hidroklorik.

[2 marks / 2 markah] (e) Explain why the total volume of carbon dioxide gas collected for both experiments are different? Jelaskan mengapa jumlah isipadu gas karbon dioksida yang dikumpul bagi kedua-dua eksperimen adalah berbeza?

[1 mark /1 markah]

[ ______ x 2 = ________ ]

END OF QUESTION PAPER KERTAS SOALAN TAMAT

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