paper 3 kimia daerah

7/28/2019 Paper 3 Kimia Daerah

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SULIT

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Kertas 3

Mei

1 1/2 jam

PEJABAT PELAJARAN DAERAH SEGAMAT

PEPERIKSAAN SETARA SETENGAH TAHUN TINGKATAN LIMA 2010

____________________________________________________________________

CHEMISTRY

Kertas 3

Satu jam dan tiga puluh minit

_____________________________________________________________________

JANGAN BUKA KERTAS SOALAN INI SEHINGGA DIBERITAHU

1. Kertas soalan ini mengandungi 2 soalan.

2. Jawab semua soalan .

3. Kalkulator biasa boleh digunakan.

Kertas soalan ini mengandungi 8 halaman bercetak.

1

No Soalan Markah

1

2

3

JUMLAH


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INFORMATION FOR CANDIDATES

1. This question paper consists ofthree questions. Answerall questions.

2. Write your answers forQuestion 1 andQuestion 2 in the spaces provided in the

question paper.3. Write your answer forQuestion 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 answerQuestion 1 andQuestion 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 concentration of nitric acid.

During the experiment , 25.0 cm3 of 0.10 moldm-3 sodium hydroxide

solution which contains phenolphthalein as an indicator is titrated withnitric acid from a burette. Diagram 1 shows the initial and final readings

of three titrations that are carried out.

Satu eksperimen dijalankan untuk menentukan kepekatan asid nitrik.Di dalam eksperimen ini 25.0 cm3 0.10 moldm-3 larutan natrium hidroksida

yang mengandungi fenolftalein sebagai penunjuk dititratkan dengan asid nitrik

daripada buret. Rajah 1 menunjukkan bacaan awal awal dan akhir bagi tiga

titratan.

Experiment Burette reading

3

Initial reading : ________

Final reading : ________




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Diagram 1

Rajah 1

a) Complete Diagram 1 by recording the reading for each of the titrations.

Lengkapkan Jadual 1 dengan merekod bacaan buret bagi ketiga-tiga titratan.[ 3 marks ]

b) Construct a table to record the data collected.

[ 3 marks ]

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c) Draw a labeled diagram for the set-up of apparatus for this experiment.

Lukis gambarajah berlabel bagi penyediaan alat radas untuk eksperimen

di atas

[ 3 marks ]

d) Phenolphthalein is used as an indicator for this experiment.

Fenoftalein digunakan sebagai penunjuk bagi eksperimen ini.

i)State the change in colour of phenolphthalein at the end of titration.

Nyatakan perubahan warna pada takat akhir titratan.

____________________________________________________________

[ 3 marks ]

ii)What inference can be made based on the answer in (c) (i)?

Apakah inferens yang boleh dibuat berdasarkan jawapan anda di(c) (i)

____________________________________________________________[ 3 marks ]

e) Give the operationally definition on monoprotic acid.Berikan definisi secara operasi bagi asid monoprotik.

_____________________________________________________________

_

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_____________________________________________________________

_

[ 3 marks ]

f) (i) Calculate the average volume of nitric acid used.

Kirakan purata isipadu asid nitrik yang digunakan.

[ 3 marks]

(ii)Calculate the concentration of nitric acid used in the experiment

Kira kepekatan asid nitrik yang digunakan dalam eksperimen ini.

[ 3 marks ]

g) Give the relationship between the concentration of acid and the volume of

acid needed in neutralization.Berikan hubungan di antara kepekatan asid dan isipadu asid yang

diperlukan untuk peneutralan.

______________________________________________________________

_____________________________________________________________

_[ 3 marks ]

h) If the experiment is repeated using hydrochloric acid and sulphuric acidin the same condition separately to replace nitric acid predict the volume

of hydrochloric acid and sulphuric acid needed to obtain the end point.

Sekiranya eksperimen ini diulangi menggunakan asid hidroklorik dan asidsulfurik dengan keadaan yang sama secara berasingan, ramalkan isipadu

bagi asid hidroklorik dan asid sulfuric

yang diperlukan untuk mendapatkan

takat akhir.

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Volume of hydrochloric acid : ____________________________________

Isipadu asid hidroklorikVolume of sulphuric acid : ____________________________________

Isipau asid sulfuric

[ 3 marks ](i) The following is a list of acids.

Berikut adalah senarai beberapa jenis asid.

Ethanoic acid

Asid etanoik

Citric acid

Asid sitrik

Hydrochloric acid

Asid hidroklorik

Sulphuric acid

Asid sulfurik

Classify these into organic acid and inorganic acid Kelaskan asid-asid ini kepada asid organik dan asid bukan organik

[ 3 marks ]

Total

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2.

By referring to the situation above, plan a laboratory experiment to investigate the effectof alloy formation on the hardness of a metal.

Merujuk kepada situasi di atas rancangkan satu eksperimen dalam makmal untuk

mengkaji kesan pengaloian terhadap kekerasan logam.

Your planning must include the following items:

Perancangan anda hendaklah mengandungi perkara-perkara berikut:

a) Statement of the problem

Penyataan masalah

b) All the variables

Semua pembolehubah

c) Hypothesis

Hypothesis

d) List of substance and apparatus

Senarai bahan dan alat radas

e) Procedure

Prosedur

f) Tabulation of data

Penjadualan data

[ 17 marks]

8

Copper wire in an electric cable can be easily bent by hand. A one-cent coin

made of an alloy of copper with tin and zinc cannot be bent easily.

Dawai kuprum yang terdapat dalam kabel elektrik boleh dibengkokkan

dengan mudah menggunakan tangan. Duit siling satu sen yang diperbuat

daripada aloi kuprum dengan stanum dan zink tidak boleh dibengkokkandengan mudah.


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End of Questions

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