kimia mid year 2010 t4 p3

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Kertas 3

Mei

1 1/2 jam

PEJABAT PELAJARAN DAERAH SEGAMAT

PEPERIKSAAN SETARA SETENGAH TAHUN TINGKATAN EMPAT 2010

_____________________________________________________________________

CHEMISTRY

Kertas 3

Satu jam dan tiga puluh minit

_____________________________________________________________________

JANGAN BUKA KERTAS SOALAN INI SEHINGGA DIBERITAHU

1. Kertas soalan ini mengandungi 3 soalan.

2. Jawab semua soalan .

3. Kalkulator biasa boleh digunakan.

____________________________________________________________________

Kertas soalan ini mengandungi 9 halaman bercetak.

No Soalan Markah

1

2

3

JUMLAH



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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.

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. Diagram 1.1 shows the set-up of apparatus for an experiment to compare the reactivity

of alkali metals towards their reaction with oxygen.

Rajah 1.1 menunjukkan susunan radas bagi eksperimen untuk membandingkan

kereaktifan logam alkali apabila bertindak balas dengan oxygen.

Diagram 1.1 Rajah 1.1

The experiment is carried out using a small piece of lithium, potassium and sodium to

react with oxygen gas respectively.

Observations on the alkali metals in the experiment are shown in Table 1.1.

Eksperimen telah dijalankan dengan menggunakan butiran kecil lithium, kalium dan

natrium untuk bertindak balas dengan gas oksigen masing-masing.

Set

Set

Set-up of apparatus

Susunan radas

Observation

Pemerhatian

I

Lithium burns slowly and

produces white fume.

Litium terbakar dengan

perlahan dan menghasilkan

wasap putih

II

White fumes

Wasap putih

Lithium

Litium

White fumes

Wasap putih

Potassium

Kalium

Oxygen

Gas jar

Alkali metal

For

Examiner’s

Only

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III

Table 1.1

Jadual 1.1

(a) Look at the flame produced in each experiment in Table 1.1. Complete Table 1.1

by stating the observation for each reaction of alkali metals towards oxygen.

Perhatikan nyalaan yang terhasil di dalam setiap eksperimen di dalam Jadual

1.1. Lengkapkan Jadual 1.1 dengan menyatakan pemerhatian bagi setiap tindak

balas logam alkali dengan oksigen.

[3 marks]

(b) Based on the experiment, complete the table below.

Berdasarkan kepada eksperimen tersebut, lengkapkan jadual di bawah.

Manipulated variable:

Pembolehubah

dimanipulasikan:

_______________________

________________________

Method to manipulate the variable:

Kaedah untuk memanipulasikan pembolehubah:

_______________________________________

_______________________________________

Responding variable:

Pembolehubah bergerak

balas:

________________________

________________________

How the variable is responding:

Bagaimana pembolehubah itu bergerakbalas:

______________________________________

_______________________________________

Fixed variable:

Pembolehubah dimalarkan:

________________________

________________________

Method to maintain the fixed variable:

Kaedah menetapkan pembolehubah :

_______________________________________

_______________________________________

[6 marks]

White fumes

Wasap putih

Sodium

Natrium

1(a)

1(b)

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(c) State one hypothesis for the experiment.

Nyatakan satu hipotesis bagi eksperimen ini.

………………………………………………………………………………………

………………………………………………………………………………………

………………………………………………………………………………………

[3 marks]

(d) Give one inference based on the results of the reaction between lithium and oxygen

gas.

Berikan satu inferens berdasarkan pemerhatian ke atas tindak balas litium dengan gas

oksigen.

………………………………………………………………………………………

………………………………………………………………………………………

[3 marks](e) The experiment is repeated using a small piece of rubidium to react with oxygen.

Rubidium is more reactive than lithium, potassium and sodium. Predict the

observation for this experiment.

Eksperimen diulang dengan menggunakan butiran kecil rubidium yang bertindak

balas dengan gas oksigen. Rubidium lebih reaktif daripada litium, kalium dan

natrium. Ramalkan pemerhatian bagi tindak balas di antara rubidium dan gas

oksigen.

………………………………………………………………………………………

………………………………………………………………………………………

[3 marks]

(f) The following substaces are some oxides of element from the Periodic Table of

Elements.

Jadual berikut menunjukkan beberapa oksida unsur-unsur daripada Jadual Berkala

Unsur.

Classify the oxides into two groups, those which are basic oxides and thosewhich are acidic oxides. Present your answer in a suitable table.

Kelaskan oksida-oksida di atas kepada dua kumpulan iaitu oksida bes dan oksidaasid. Tuliskan jawapan anda di dalam jadual yang sesuai.

[3 marks]

TOTAL

1(c)

1(d)

1(e)

zinc oxide // zink oksida

sulphur dioxide // sulfur dioksida

carbon dioxide // karbon dioksida

sodium oxide // natrium okside

1(f)

For

Examiner’s

Only

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2. Diagram 2.1 shows the apparatus set-up for the experiment to determine the melting

point of naphtalene. Solid naphtalene is heated in a water bath slowly until the

temperature reach 90 ºC .

Rajah 2.1 menunjukkan susunan radas bagi eksperimen untuk menentukan takat lebur

naftalena. Pepejal naftalena dipanaskan perlahan-lahan di dalam kukus air sehingga

mencapai suhu 90 ºC .

Diagram 2.1

Rajah 2.1

The readings of the temperature is recorded every 30 seconds. Diagram 2.2 shows the

thermometer reading at 30 seconds intervals.

Bacaan suhu dicatatkan setiap 30 saat. Rajah 2.2 menunjukkan bacaan termometer pada

sela 30 saat.

Temperature at

30 seconds : ……………...

Temperature at

60 seconds : ……………...

For

Examiner’s

Only

Kegunaan

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Temperature at90 seconds : ……………...

Temperature at120 seconds : ……………...

Temperature at

150 seconds : ……………...

Temperature at

180 seconds : ……………...

For

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Only

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Diagram 2.2

(a) Record the temperature in spaces provided in Diagram 2.2.

Rekodkan bacaan suhu pada ruang yang disediakan di dalam Rajah 2.2

[3 marks]

b) Draw a graph of temperature against time for the heating of naphtalene.

Lukiskan graf suhu melawan masa pemanasan naftalena.

[3 marks]

(c) Use the graph in (b) to determine the melting point of naphtalene. Show on the graph

how you determine the melting point.

Gunakan graf di (b) untuk menentukan takat lebur naftalena. Tunjukkan bagaimana anda

menentukan takat lebur itu di atas graf yang anda lukiskan.

[3 marks]

(d) Define operationally melting point of naphtalene.

Definisikan secara operasi takat lebur naftalena.

………………………………………………………………………………………………

……………………………………………………………………………………

[3 marks]

TOTAL

2(a)

2(b)

2(c)

2(d)

Temperature at

210 seconds : ……………...

Temperature at

240 seconds : ……………...

For

Examiner’s

Only

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3. The three statement below describe the observation when Group 17 element

react with iron wool.

Tiga pernyataan di bawah menghuraikan pemerhatian yang dibuat apabila

Kumpulan 17 bertindak balas dengan kapas besi.

Statement 1 / Pernyatan 1

Iron wool ignites rapidly with bright flame when react with chlorine gas. A

brown solid is deposited.

Kapas besi menyala cepat dengan nyalaan terang apabila berindak balas

dengan gas klorin. Pepejal perang terbentuk.

Statement 2 / Pernyataan 2

Iron wool glows brightly when react with bromine gas. A brown solid is

deposited.

Kapas besi berbara terang apabila bertindakbalas dengan gas bromin.

Pepejal perang terbentuk.

Statement 3 / Pernyataan 3

Iron wool glows dimly and slowly when react with iodine vapour . A brown

solid is deposited.

Kapas besi berbara malap secara perlahan-lahan apabila bertindak balas

dengan wap iodin. Pepejal perang terbentuk.

Plan a laboratory experiment to investigate the reactivity of chlorine, bromine

and iodine with iron wool.

Rancang satu eksperimen makmal untuk mengkaji tindak balas antara klorin,

bromin dan iodin dengan kapas besi.

Your planning should include the following aspects:

Perancangan anda hendaklah mengandungi aspek-aspek berikut:

(a) Problem Statment

Pernyataan masalah

(b) All the variables

Semua pembolehubah

(c) Statement of the hypothesis

Pernyataan hipotesis

(d) List of substances and apparatus

Senarai bahan dan radas

(e) Procedure of the experiment

Prosedur eksperimen.

(f) Tabulation of data

Penjadualan data

[ 17 marks]

For

Examiner’s

Only Kegunaan

pemeriksa

sahaja

kimia mid year 2010 t4 p3

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