trial. edu. ] Pahang JUJ 2012 SPM... 1 The equation below shows a reaction to produce hydrogen

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Text of trial. edu. ] Pahang JUJ 2012 SPM... 1 The equation below shows a reaction to produce hydrogen

• 1 The equation below shows a reaction to produce hydrogen gas. Persamaan di bawah menunjukkan tindak balas bagi menghasilkan gas hydrogen.

2HCl + Zn → ZnCl2 + H2

Which of the following would increase the rate of production of hydrogen gas? Manakah antara pernyataan berikut meningkatkan kadar penghasilan hydrogen gas.

A Increase the time of the reaction Meningkatkan masa tindak balas B Increase the volume of acid Meningkatkan isipadu asid C Increase the size of granulated zinc Meningkatkan saiz ketulan zink D Increase the temperature of the mixture Meningkatkan suhu campuran

(27/2003) 2 Which of the following can be used to determine the rate of the reaction?

Manakah antara pernyataan berikut dapat digunakan untuk menentukan kadar tindak balas?

I Release of gas per unit time Menghasilkan gas per unit masa II Change of the colour intensity per unit time Perubahan keamatan warna per unit masa III Formation of precipitate per unit time Penghasilan mendakan per unit masa IV Increase in the mass of reactant per unit time Meningkatkan jisim bahan tindak balas per unit masa A I and II only I dan II sahaja B III and IV only III dan IV sahaja C I, II and III only I,II dan III sahaja D II,III and IV only II,III dan IV sahaja

(18/2003)

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• 3 Table 4 shows the total volume of gas collected at regular intervals in a reaction. Jadual 4 menunjukkan jumlah isipadu gas yang dikumpul pada sela masa dalam suatu

tindak balas.

Time/s Masa/s 0 30 60 90 120 150 180 210

Volume of the gas/cm3 isipadu gas/ cm3 0.0 2.0 3.7 5.2 6.4 7.3 8.6 8.6

What is the average rate of the reaction in the second minute? Apakah kadar tindak balas purata pada minit kedua? A 0.040 cm3 s-1

B 0.045 cm3 s-1 C 0.053 cm3 s-1 D 0.062 cm3 s-1

(44/2003) 4 The equation below represents the decomposition of hydrogen peroxide solution. Persamaan berikut mewakili penguraian larutan hidrogen peroksida

2H2O2(aq) → 2H2O(l) + O2(g)

Which of the following are produced when 1 mole of hydrogen peroxide is decomposed completely? Manakah antara berikut yang akan terhasil apabila 1 mol hydrogen peroksida diuraikan dengan lengkap? (1 mole of gas occupies 24 dm3 at room condition; Avogadro’s Constant: 6.0 x 1023 mol-1

1 mol gas memenuhi 24 dm3 pada suhu bilik: Avogadro’s constant: 6.0 x 1023 mol-1) I 2 mole of water 2 mol air II 12 dm3 of oxygen gas 12 dm3 oksigen gas III 3 x 1023 of water molecules 3 x 1023 molekul air IV 1.2 x 1024 of water molecules 1.2 x 1024 molekul air

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• A I and III only I dan III sahaja B I and IV only I dan IV sahaja C II and III only II dan III sahaja D II and IV only II dab IV sahaja

(48/2003) 5 The rate of reaction for the decomposition of hydrogen peroxide decreases with the time

because Kadar tindak balas untuk penguraian hydrogen peroksida berkurangan dengan masa

kerana A Product of the reaction decreases Hasil tindak balas berkurangan B Temperature of hydrogen peroxide decreases Duhu hydrogen peroksida berkurangan C Volume of the hydrogen peroxide decreases Isipadu hydrogen peroksida berkurangan D Concentration of hydrogen peroxide decreases Kepekatan hydrogen peroksida berkurangan

(14/2004)

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• 6 An experiment is carried out to study the rate of reaction between marble and hydrochloric acid to produce carbon dioxide gas.

Satu eksperimen dijalankan untuk mengkaji tentang kadar tindak balas antara marmar dengan asid hidroklorik bagi menghasilkan gas karbon dioksida

Experiment Ekperimen

Substances Bahan

I Excess marble and 50.00 cm3 of 2 mol dm-3 hydrochloric acid Marmar berlebihan dan 50.00 cm3 asid hidroklorik 2 mol dm-3

II Excess marble and 100.00 cm3 of 1 mol dm-3 hydrochloric acid Marmar berlebihan dan 100.00 cm3 asid hidroklorik 1 mol dm-3

Which of the following graphs represents the two experiments? Manakah antara graf berikut yang mewakili dua eksperimen ini? A B C D

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• 7 The reaction between hydrochloric acid and zinc produces hydrogen gas. The reaction is complete in 50 seconds and the maximum volume of gas produced is 25 cm3. What is the average rate of the reaction?

Tindak balas antara asid hidroklorik dan zink menghasilkan hydrogen gas. Tindak balas ini lengkap dalam masa 50 saat dan isipadu gas yang terhasil ialah sebanyak 25 cm3. Apakah kadar tindak balas purata dalam tindak balas ini?

A 0.5 cm3 s-1 B 1.0 cm3 s-1 C 2.0 cm3 s-1 D 4.0 cm3 s-1

(45/2004) 8 The table shows the mass of sulphur trioxide formed at different temperatures during the

yang berlainan.

Temperature/oC Suhu/ oC

300 400 500 600

Mass of suphur trioxide/kg Jisim sulfur trioksida/kg

350 200 120 100

Time taken Masa

5 hours 2 hours 6 minutes 9 minutes

At what temperature is the production rate of sulphur trioxide the highest? Pada suhu keberapakah kadar penghasilan tertinggi bagi sulfur trioksida? A 300 oC B 400 oC C 500 oC D 600 oC

(46/2004)

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• 9 The diagram shows the energy profile of a reaction. Ea is the activation energy for this reaction

Gambar rajah menunjukkan profil tenaga bagi suatu tindak balas. Ea adalah tenaga pengaktifan bagi tindak balas ini.

What will change the activation energy from Ea to Ea’? Apakah yang akan mengubah tenaga pengaktifan daripada Ea ke Ea’?

A Temperature Suhu B Catalyst Mangkin C Concentration Kepekatan D Total surface area Jumlah luas permukaan

(12/2005) 10 Which of the following explains the meaning of effective collision? Antara pernyataan berikut yang manakah menjelaskan maksud perlanggaran yang

berkesan? A The collision where its energy is less than the activation energy Perlanggaran yang tenaganya kurang dari tenaga pengaktifan B The collision that has a low energy Perlanggaran yang berlaku mempunyai tenaga yang rendah

C The collision which takes place before a reaction Perlanggran yang berlaku sebelum sesuatu tindak balas

D The collision that causes a reaction Perlanggran yang menghasilkan tindak balas.

(13/2005)

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• 11. The diagram shows the set up of the apparatus for an experiment to determine the rate of the reaction between thiosulphate and sulphuric acid.

Gambar rajah menunjukkan susunan radas bagi eksperimen untuk menentukan kadar tindak balas antara natrium tiosulfat dengan asid sulfuric.

Which of the following combination of conditions take a shortest time for the mark X to disappear from sight? Antara kombinasi keadaan berikut yang manakah mengambil masa paling singkat untuk tanda X hilang daripada penglihatan?

A B C D

(45/2005)

Sulphuric acid

Sodium thiosulphate solution

Temperature/oC Volume /cm3

Concentration /mol dm-3

Volume /cm3

Concentration /mol dm-3

10 10 10 20

1.0 1.0 0.5 0.5

50 50 50 40

0.5 0.5 0.5 0.5

30 40 30 40

12. Which of the following is not a characteristic of a catalyst? Antara yang berikut, yang manakah bukan ciri-ciri mangkin? A A catalyst is specific in its reaction Mangkin adalah kursus dalam tindak balasnya. B A catalyst influences the quality of product reaction Mangkin mempengaruhi kuantiti hasil tindak balas.

C The chemical property of a catalyst remains unchanged at the end of the reaction Sifat kimia mangkin tetap tidak berubah di akhir tindak balas. D Only a little amount of a catalyst is needed to influence of the rate of the reaction Hanya sedikit mangkin diperluaskan untuk mempengaruhi kadar tindak balas.

(13/2006)

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• 13. In an experiment, the decomposition of 25 cm3 of 0.1 mol dm-3 hydrogen peroxide solution produces oxygen gas.

Dalam satu eksperimen, penguraian 25 cm3 larutan hydrogen peroksida 0.1 mol dm-3 menghasilkan gas oksigen. Graf isipadu gas osigen melawan masa dilukis dan lengkung P diperoleh.

If experiment is repeated using another solution, which solution will produce curve Q?

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