Betul Kimia Ub1 2017 F5.docx

BAHAGIAN A Soalan Objektif (8 Soalan) 1

Manakah antara sebatian berikut adalah sebatian organic? Which of the compounds is an organic compound? A Glukosa Glucose B Karbon monoksida Carbon monoxide C Karbon dioksida Carbon dioxide D Kalsium karbonat Calcium carbonate

2

Antara yang berikut, yang manakah benar tentang hidrokarbon? Which of the following is true about hydrocarbon? A Hidrokarbon adalah sebatian organic tepu Hydrocarbons are saturated organic compounds B Hidrokarbon mengandungi hidrogen dan karbon sahaja Hydrocarbons contain hydrogen and carbon only. C Hidrokarbon adalah larut di dalam pelarut inorganik. Hydrocarbons are soluble in inorganic solvents. D Hidrokarbon adalah semua sebatian organik. Hydrocarbons are all organic compounds.

3

Persamaan antara etana dan etena ialah kedua-duanya, The similarity between ethane and ethene is both, A Mempunyai dua atom karbon di dalam molekulnya have two carbon atoms in the molecule B merupakan hidrokarbon tepu are saturated hydrocarbons C dalam siri homolog yang sama are in the same homologous series D larut dalam air are soluble in water

4

Manakah antara berikut adalah formula am bagi alkana? Which of the following is the general formula of an alkane? A CnH2n B CnH2n+1 C CnH2n+2 D CnH2n+1OH

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Rajah di bawah menunjukkan gambar rajah isi padu gas oksigen melawan masa bagi tindak balas antara zink dan asid sulfurik. Graf X diperoleh apabila butiran zink berlebihan ditindakbalaskan dengan 25cm3 asid sulfurik 1 moldm-3. The diagram below shows the graph of the volume of oxygen gas against time for the reaction between zinc and sulphuric acid. Curve X is obtained when excess granulated zinc is reacted with 25cm3 of 1 moldm-3 sulphuric acid.

Rajah 1 Diagram 1 Antara berikut, yang manakah perlu dilakukan untuk menghasilkan graf Y? Which of the following must be done to produce curve Y? A B C D

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Menggantikan butiran zink dengan serbuk zink Replace granulated zinc with zinc powder Menambahkan beberapa titik larutan kuprum (II) sulfat Add a few drops of copper (II) sulphate solution Menggantikan 25 cm3 asid sulfurik 1 moldm-3 dengan 25 cm3 asid sulfurik 2 moldm-3 Replace 25 cm3 of 1 mol dm-3 sulphuric acid with 25 cm3 of 2 mol dm-3 Menggantikan 25 cm3 asid sulfurik 1 moldm-3 dengan 50 cm3 asid sulfurik 1 moldm-3 Replace 25 cm3 of 1 mol dm-3 sulphuric acid with 50 cm3 of 1 mol dm-3

Rajah 2 menunjukkan graf isipadu gas yang terhasil melawan masa untuk tindak balas antara kalsium karbonat dan asid hidroklorik. Diagram 2 shows the graph of the volume of gas produced against time for the reaction between calcium carbonate and hydrochloric acid. Isipadu gas (cm3) Volume of gas (cm3)

Masa (s) Time (s)

Rajah 2 Diagram 2 2

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Kecerunan lengkung berkurang dengan masa kerana The gradient of the curve decreases with time because A asid hidroklorik adalah sejenis asid monobes hydrochloric acid is a type of monoprotic acid B suhu tindak balas berkurang temperature of reaction decreases C isipadu campuran berkurang volume of mixture decreases D kepekatan asid hidroklorik berkurang concentration of hydrochloric acid decreases

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Faktor manakah yang tidak mempengaruhi kadar tindak balas? Which factor does not affect the rate of reaction? A Isipadu bahan tindak balas Volume of reactant B Kepekatan bahan tindak balas Concentration of reactant C Suhu bahan tindak balas Temperature of reactant D Saiz pepejal bahan tindak balas Size of solid reactant

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Masa yang diambil untuk 2 g serbuk magnesium bertindak balas lengkap dengan asid hidroklorik berlebihan ialah 5 minit. Berapakah kadar purata bagi tindak balas ini? The time taken for 2 g of magnesium powder to react completely with excess hydrochloric acid is 5 minutes. What is the average rate of the reaction? A 0.4 g s-1 B 0.4 g min-1 C 2.5 g s-1 D 2.5 g min-1

JAWAPAN 1

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BAHAGIAN B Soalan Subjektif (3 Soalan)

1. Dua pasukan Perekacipta Muda mengambil bahagian dalam Pertandingan Saintis Muda semasa Minggu Sains di sekolah mereka. Mereka menjalankan satu eksperimen untuk mengkaji kadar tindak balas antara serbuk kulit kerang dengan asid hidroklorik. Kulit kerang mengandungi peratusan kalsium karbonat yang tinggi. Dalam pertandingan ini, kedua-dua pasukan ini cuba mengubahsuai eksperimen ini berdasarkan faktor-faktor yang bersesuaian yang mempengaruhi kadar tindak balas. Pasukan mana yang terlebih dahulu dapat mengumpul isi padu maksimum dikira pemenang Two Young Inventor Teams took part in the Young Scientist Competition during Science Week at their school. They carried out an experiment to investigate the rate of reaction between cockle shell powder and 40 cm3 of 0.1 mol dm-3 hydrochloric acid. The cockle shell contains a high percentage of calcium carbonate. In this competition, both teams try to modify their experiment based on suitable factors that affect rate of reaction. The team that collected the maximum volume first was the winner. Jadual 1.1 dan 1.2 menunjukkan keputusan ekperimen pada isi padu gas karbon dioksida yang dikumpulkan pada setiap 30 saat oleh kedua-dua pasukan. Table 1.1 and 1.2 shows the results for the volume of carbon dioxide gas collected at every 30 second by both team. Pasukan I / Team I Masa / s Time / s Jumlah isi padu gas karbon dioksida yang dikumpul (cm3) Total volume of carbon dioxide gas collected

0

30

60

90

120

150

180

210

240

270

0.00

7.00

13.50

19.50

24.50

30.00

34.50

39.00

42.00

42.00

Jadual 1.1 / Table 1.1 Pasukan II / Team II Masa / s Time / s Jumlah isi padu gas karbon dioksida yang dikumpul (cm3) Total volume of carbon dioxide gas collected

0

30

60

90

120

150

180

210

240

270

0.00

11.00

19.50

27.00

33.50

38.50

42.00

42.00

42.00

42.00

Jadual 1.2 / Table 1.2 4

Berdasarkan keputusan dalam Jadual 1.1 dan 1.2, Based on result in Table 1.1 and 1.2, (a) Tuliskan persamaan kimia bagi tindak balas di antara kalsium karbonat dan asid hidroklorik. Write the chemical equation for the reaction between calcium carbonate and hydrochloric acid . ............................................................................................................................................................. [2 markah] (b) Lukiskan graf jumlah isi padu gas karbon dioksida yang dikumpul melawan masa bagi Pasukan I dan Pasukan II pada paksi yang sama. Draw a graph of total volume of carbon dioxide gas collected against time for Team I and Team II on the same axes.

[3 markah] (c)

Dengan menggunakan graf yang telah diplotkan di (b), tentukan kadar tindak balas pada saat ke60 bagi Pasukan I dan Pasukan II. By using the graph you have drawn in (a)(ii), determine the rate of reaction at 60 seconds for Team I and Team II. Pasukan I / Team I :

Pasukan II / Team II :

[4 markah] (d) Bandingkan kadar tindak balas Set I dan Set II. Jelaskan jawapan anda berdasarkan Teori Pelanggaran. Other than size of reactant, what other possible method was used by the winning team to increase the rate of reaction? Explain your answer based on the Collision Theory. …......................................................................................................................................................... …......................................................................................................................................................... …......................................................................................................................................................... …......................................................................................................................................................... [5 markah]

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2.

serpihan porselin / Porcelain chips

Hidrokarbon A Hydrocarbon A

+ H2

Butan-1-ol C4H9OH

Kalium dikromat(VI) berasid / Acidified potassium dichromate(VI)

Asid butanoik/ butanoic acid C3H7COOH

Hidrokarbon B / Hydrocarbon B

Rajah 3 Diagram 3 Rajah 3 menunjukkan aliran tindak balas bagi beberapa sebatian karbon. Diagram 3 shows a reaction flow chart of some carbon compound (a) (i)

Namakan hidrokarbon A dan hidrokarbon B Name hydrocarbon A and hydrocarbon B Hidrokarbon A

………………………………………………………………

Hidrokarbon B ……………………………………………………………….. [2 markah] (ii)

Lukiskan formula struktur bagi hidrokarbon A Draw the structural formula of hydrocarbon A.

[1 markah] (b) Draw the set-up of apparatus to produce hydrocarbon A from butan-1-ol. Lukiskan gambarajah radas untuk menghasilkan hidrokarbon A dari butan-1-ol.

[2 markah] 6

(c)

(i)

Nyatakan fungsi kalium dikromat(VI) berasid. State the function of acidified potassium dichromate(VI) ……………………………………………………………………………………………………………. [1 markah]

(ii)

Nyatakan dua sifat kimia bagi butanoic acid State two chemical properties for butanoic acid ……………………………………………………………………………………………………………. ……………………………………………………………………………………………………………. [2 markah]

3. Rajah 4 menunjukkan pembentukan zink nitrat dan perubahnnya kepada sebatian lain. Diagram 4 shows the formation of zinc nitrate and the changes to other compounds. Panaskan

+ Bahan X

Zink oksida

+ Substance X

Zinc oxide

Heat

Zink nitrat

Zinc nitrate

Gas Perang

Brown Gas + Larutan kalium karbonat + Potassium carbonate solution /

Mendakan Z

+

Kalium nitrat

Precipitate Z

+

Potassium nitrate

Rajah 4 Diagram 4 (a)

(i)

Zink oksida bertindakbalas dengan bahan X untuk mebentuk zink nitrat. Namakan sebatian X. Zink oxide reacts with substance X to form zinc nitrate. State the name of substance X. ……………………………………………………………………………………………………………. [1 markah]

(ii)

Tuliskan satu persamaan kimia untuk tindakbalas dalam (a)(i). Write the chemical equation for the reaction in (b)(i). …………………………………………………………………………………………………………… [2 markah]

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(c)

Namakan gas perang yang terbentuk. State the name of the brown gas formed. …………………………………………………………………………………………………………………. [1 markah]

(d) Apabila larutan kalium karbonat ditambah kepada larutan zink nitrat, mendakan Z dan kalium nitrat terbentuk. When potassium carbonate solution is added to zinc nitrate solution, precipitate Z and potassium nitrate formed. Namakan jenis tindakbalas yang berlaku. State the type of reaction occurs. …………………………………………………………………………………………………………………. [1 markah] (e) Larutan zink nitrat berlebihan ditambah kepada 100cm3 larutan kalium karbonat 1 moldm-3. Tuliskan persamaan kimia terlibat dan hitungkan jisim zink karbonat yang terbentuk. [Jisim atom relatif : Zn = 65, C=12, O=16] Excess of zinc nitrate solution is added to 100cm3 of 1 moldm-3 potassium carbonate. Write the chemical equation involved and calculate the mass of zinc carbonate formed. [Relative atomic mass : Zn = 65, C=12, O=16]

[5 markah]

KERTAS SOALAN TAMAT

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