kertas kimia 3

7/28/2019 KERTAS KIMIA 3

1/14

Untuk Kegunaan Pemeriksa

Soalan Markah

Penuh

Markah

Diperoleh

1 15

2 18

3 17

JUMLAH 50

4541/3

Chemistry

Paper 3

2013

1 1/2 jam

SEKOLAH MENENGAH KEBANGSAAN DOKTOR MEGAT KHAS, IPOH

PEPERIKSAAN PERTENGAHAN TAHUN

2013

CHEMISTRY

FORM 4

Paper 3

1 hour 30 minutes

JANGAN BUKA KERTAS SOALAN INI SEHINGGA DIBERITAHU

1. Tuliskan nama dan tingkatan pada ruangyang disediakan.

2. Jawab semua soalan

Disediakan oleh:

.....................................................JUNI FARHANA BT HASSANKETUA PANITIA KIMIA

Disemak dan disahkan oleh:

.......................................................PN ALINA BT OMAR GURU KANAN MATEMATIK DAN SAINS

_________________________________________________________________________

Kertas soalan ini mengandungi 13 halaman bercetak

Name :

Class : ..


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MAKLUMAT UNTUK CALON

1. Kertas soalan ini mengandungi tiga soalan. Jawab semua soalan.

2. Tuliskan jawapan bagi Soalan 1 dan Soalan 2 dalam ruang yang disediakan dalam

kertas soalan.

3. Tuliskan jawapan bagi soalan 3 pada halaman bergaris di bahagian akhir kertassoalan ini dengan terperinci. Anda boleh menggunakan persamaan, gambar rajah,

jadual, graf dan cara lain yang sesuai untuk menjelaskan jawapan anda

4. Tunjukkan kerja mengira, ini membantu anda mendapatkan markah.

5. Sekiranya anda hendak membatalkan sesuatu jawapan, buat garisan di atas jawapan itu.

6.

Rajah yang mengiringi soalan tidak dilukis mengikut skala kecuali dinyatakansebaliknya.

7. Markah yang diperuntukkan bagi setiap soalan atau ceraian soalan ditunjukkandalam kurungan.

8. Masa yang dicadangkan untuk menjawab Soalan 1 dan Soalan 2 ialah 45 minit danSoalan 3 ialah 45 minit.

9. Anda dibenarkan menggunakan kalkulator saintifik yang tidak boleh diprogramkan.

10. Serahkan semua kertas jawapan anda di akhir peperiksaan.

Pemberian markah :

Skor Penerangan

3 Cemerlang: Respons yang paling baik

2 Memuaskan : Respons yang sederhana

1 Lemah : Respons yang kurang tepat

0 Tiada respons atau respons salah


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INFORMATION FOR CANDIDATES 1. This question paper consists of three questions. Answer all questions.

2. Write your answers for Question 1 and Question 2 in the spaces provided in the question

paper.

3. Write your answer for Question 3 on the lined pages at the end of the question paper in

detail. You may use equations, diagrams, tables, graphs and other suitable methods to

explain your answer.

4. Show your working. It may help you to get marks.

5. If you wish to cancel any answer, neatly cross out the answer.

6. The diagrams in the questions are not drawn to scale unless stated.

7. Marks allocated for each question or part question are shown in brackets.

8.

The time suggested to answer Question 1 and Question 2 is 45 minutes and Question 3 is 45 minutes .

9. You may use a non-programmable scientific calculator.

10. Hand in this question paper at the end of the examination.

Marks awarded:

Mark Description

3 Excellent : The best response

2 Satisfactory : An average response

1 Weak : An inaccurate response

0 No response or wrong response


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Answer all questions.

Jawab semua soalan .

1 An experiment is carried out to determine the freezing point of naphthalene. Solid naphthaleneis heated in a water bath until its melts completely.

Eksperimen menunjukkan penentuan takat beku naftalena. Pepejal naftalena dipanaskan didalam kukus air sehingga melebur dengan lengkap.

The initial temperature is recorded.Suhu awal direkod

The molten naphthalene is left to cool. Naftalena yang lebur dibiarkan sejuk.

The reading of the temperature is recorded every 30 seconds. Bacaan suhu direkod setiap 30 saat.

Figure 1 shows the recorded thermometer readings at 30 seconds intervals. Rajah 1 menunjukkan bacaan termometer yang direkod setiap 30 saat.

Figure 1

Rajah 1 (a) Record the temperatures in the spaces provided in Figure 1.

For Examiners

Use


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Rekod suhu di dalam ruang yang disediakan dalam rajah 1.[3 marks]

[3 markah ]

(b) On the graph paper, draw the graph of temperature against time for the cooling of naphthalene.

Pada kertas graf, lukiskan graf suhu melawan masa penyejukkan naftalena.

[3 marks][3 markah ]

3

1(a)

3

1(b)


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(c) Use the graph paper in (b), to determine the freezing point of naphthalene.Show on the graph how you determine this freezing point.Menggunakan kertas graf di (b), tentukan takat beku naftalena. Tunjukkan di dalamgraf bagaimana anda menentukan takat beku.

[3 marks][3 markah ]

(d) The temperature of naphthalene did not change from the 90 seconduntil the 150 second during the cooling process. Explain why.Suhu naftalena tidak berubah dari masa 90 saat ke 150 saat semasa proses penyejukkan. Terangkan mengapa?

.

. [ 3 marks]

[3 markah ]

(e) Sketch the graph you would expect if the molten naphthalene is cool quickly.Lakar graf yang anda jangkakan jika naftalena lebur disejukkan secara melampau

[ 3 marks] [3 markah ]

3

1(c)

For Examiners

Use

3

1(d)

3

1(e)


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2 The alkali metals in Group 1 of the Periodic Table of Elements can react with oxygen gas withdifferent reactivity.

Table 1 shows the experiment and observation when Lithium, Li, Sodium, Na and Potassium,K react with Oxygen, O 2 gas.

Logam alkali dalam Kumpulan 1 Jadual Berkala Unsur boleh bertindak balas dengan gasoksigen dengan kereaktifan berbeza.

Jadual 1 menunjukkan eksperimen dan pemerhatian apabila Litium, Li, Natrium, Na dan Kalium, K bertindak balas dengan gas oksigen.

Experiment

Eksperimen

Observation

Pemerhatian

Lithium burns slowly with a red flame.

White fume is released.

White solid is produced.

Litium terbakar perlahan-lahan dengannyalaan merah.

Wasap putih di

bebaskan.

Pepejal putih terhasil.

Sodium burns vigorously with a yellow flame.



Natrium terbakar cergas dengan nyalaan kuning.

Wasap putih terbebas.


Oxygen gas

Gas oksi en

Lithium

Litium

Gas jar

Balang gas

Oxygen gas

Gas oksi enSodium

Natrium

Gas jar

Balan as


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Potassium burns very vigorously with a reddish- purple flame.



Kalium terbakar sangat cergas dengan nyalaanungu-kemerahan.

Wasap putih terbebas.


Table 1 Jadual 1

(a) State the inference for the observations in Table 1.

Nyatakan inferens bagi pemerhatian-pemerhatian dalam Jadual 1.

.

[3 marks]

[3 markah ]

(b) Based on the experiment above:

Berdasarkan eksperimen di atas:

(i) State the method to manipulate the variable.

Nyatakan kaedah untuk memanipulasi pembolehubah .

...................................................................................................................

Oxygen gas

Gas oksigen

Potassium

Kalium

Gas jar

Balang gas

For Examiners

3

2(a)


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(ii) State the responding variable.

Nyatakan pembolehubah bertindak balas.

......

(iii) State the controlled variable.

Nyatakan pembolehubah dimalarkan .

...................................................................................................................

[3 marks]

[3 markah ]

(c) State the hypothesis for the experiment.

Nyatakan hipotesis bagi eksperimen tersebut.

..............................................................................................................................

[3 marks]

[3 markah ]

(d) By refering to the reaction between alkali metals with oxygen, give the operationaldefinition for the reactivity of alkali metals.

Merujuk kepada tindak balas antara logam alkali dengan oksigen, berikan definisi secara operasi bagi kereaktifan logam-logam alkali.

...............................................................................................................................

[3 marks]

[3 markah ]

3

2(b)

3

2(c)

3

2(d)

For Examiners

Use

For Examiners

Use


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(e) Metal X is also a member of Group 1 elements.

Alkali metal X ignites spontaneously in air with a reddish-violet flame. White fumesand a white solid are also produced.

Logam X juga adalah merupakan ahli Kumpulan 1.

Logam alkali X terbakar secara spontan di udara dengan nyalaan ungu-kemerahan.Wasap putih dan pepejal putih juga terbentuk.

(i) Predict in which period, the metal X is located in the Periodic Table of

Element.

Ramalkan Kala, logam X diletakkan dalam Jadual Berkala Unsur.

.......................

[3 marks]

[3 markah ]

(ii) Based on the observations in Table 1 and (e) (i) , arrange lithium,

sodium, potassium and metal X in ascending order of reactivity of

metals towards oxygen.

Berdasarkan pemerhatian dalam Jadual 1 dan (e) (i) , susun litium,

natrium, kalium dan logam alkali X mengikut tertib menaik

kereaktifan logam terhadap oksigen.

.

[3 marks]

[3 markah ]

3

2(e)(i)

3

2(e)(ii)

For Examiners

Use


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3. Diagram below shows the reaction between element in Group 1 and water. Group 1elements, also known as alkali metals can react with water to produce an alkaline solutionwith different reactivity.

Rajah di bawah menunjukkan tindak balas di antara unsur Kumpulan 1 dan air. Unsur-unsur Kumpulan 1 juga dikenali sebagai logam alkali boleh bertindak balas dengan air untuk menghasilkan larutan beralkali dengan kereaktifan yang berbeza.

Diagram 2Rajah 2

Plan an experiment to investigate the reactivity of elements in Group 1 towardswater.Rancangkan satu eksper imen untuk mengkaji kereaktifan unsur Kumpulan 1terhadap air.Your explanation should include all the followings

Penerangan anda hendaklah mengandungi perkara-perkara berikut:

(a) Aim of the expermentTujuan eksperimen

(b) All the variables

Semua pemboleh ubah yang terlibat

(c ) Statement of the hypothesis

Pernyataan hipotesis

(d) List of materials and apparatusSenarai bahan dan alat radas

(e) Procedure of the experiment Prosedur eksperimen

(f) Tabulation of data Penjadualan data

[ 17 marks ][ 17 markah ]

END OF QUESTIONS PAPER

Group 1 elementUnsur Kumpulan 1

Water/ Air


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ANSWER SPACE

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kertas kimia 3

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