ppt 2012 form5 (paper 2)

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NAMA:___________________________TINGKATAN :_________________

SMK MUNSHI ABDULLAH, SG. AIR TAWARSABAK BERNAM SELANGOR

PEPERIKSAAN PERTENGAHAN TAHUN 20124541/2

CHEMISTRY FORM 5Kertas 2Mei2 1/2 jamDua jam tiga puluh minitJANGAN BUKA KERTAS SOALAN INI SEHINGGA DIBERITAHU

1Tuliskan nama dan tingkatan pada ruang yang disediakan.2. Kertas soalan ini adalah dwibahasa.3. Calon dibenarkan menjawab keseluruhan atau sebahagian soalan sama ada dalam bahasa Inggeris atau bahasa Melayu.INFORMATION FOR CANDIDATESMAKLUMAT UNTUK CALON1 This question paper consists of three sections. Section A, Section B and Section C.Kertas soalan ini mengandungi tiga bahagian Bahagian A, Bahagian B dan Bahagian C.2. You are advise to spend 90 minutes to answer questions in Section A, 30 minutes for Section B and 30 minutes for Section C.Anda dinasihat supaya mengambil masa 90 minit untuk menjawab soalan Bahagian A, 30 minit untuk Bahagian B dan 30 minit untuk Bahagian C.Untuk Kegunaan Pemeriksa

BahagianSoalanMarkah PenuhMarkah Diperoleh

A110

211

310

49

510

610

B720

820

C920

1020

Jumlah

1. (a) What is the meaning of empirical formula? Apakah maksud formula empirik?

________________________________________________________________________[ 1 mark ](b) Diagram 1.1 shows an incomplete equation which is one of the steps involved in determining the empirical formula.Complete this equation.Rajah 1.1 menunjukkan persamaan tak lengkap yang merupakan satu daripada langkah dalam menentukan formula empirik.Lengkapkan persamaan itu.

Mass /Jisim___________________________________ = _______________________________Relative atomic mass/Jisim atom relatif

Diagram 1.1/ Rajah 1.1[ 1 mark ]

(c) Diagram 1.2 shows the apparatus set-up for two methods used to determine the empirical formula of two compounds.Rajah 1.2 menunjukkan susunan radas bagi dua kaedah yang digunakan untuk menentukan formula empiric bagi dua sebatian.

(i) Which is suitable to be used to determine the empirical formula of magnesium oxide?Kaedah yang manakah sesuai digunakan untuk menentukan formula empiric bagi magnesium oksida?

_______________________________________________________________[ 1 mark ](ii) Why did you choose the method in 3(c)(i)?Mengapakah anda memilih kaedah di 3(c)(i)?

_______________________________________________________________[ 1 mark ](iii) When carrying out an experiment using Method I, why does crucible lid need to be opened once a while?Semasa menjalankan eksperimen menggunakan Kaedah I, mengapakah penutup mangkuk pijar dibuka sekali sekala?

_______________________________________________________________[ 1 mark ](d) Diagram 1.3 shows the result for an experiment to determine the empirical formula of lead oxide.Rajah 1.3 menunjukkan keputusan bagi satu eksperimen untuk menentukan formula empirik bagi plumbum oksida.

Mass of combustion tube= 64.00 gJisim tiub pembakaranMass of combustion tube + lead oxide= 117.52 gJisim tiub pembakaran + plumbum oksidaMass of combustion tube + lead= 113.68 gJisim tiub pembakaran + plumbum

Diagram 1.3/Rajah 1.3

Based on Diagram 1.3, determine the values of the following:Berdasarkan Rajah 1.3, tentukan nilai yang berikut:[Relative atomic mass: O = 16, Pb = 207]

(i) Mass of lead / Jisim plumbum

=_________________________g[ 1 mark ]

(ii) Number of moles of lead/Bilangan mol plumbum

=_________________________mol[ 1 mark ]

(iii) Mass of oxygen/ Jisim oksigen

=_________________________g[ 1 mark ]

(iv) Number of moles of oxygen/ Bilangan mol oksigen=________________________mol[ 1 mark ]

(v) Empirical formula of lead oxide/ Formula empiric bagi plumbum oksida

=________________________[ 1 mark ]

2. Diagram 2 shows a part of the Periodic Table of Elements. The symbols P, Q, R, S and T do not represent the actual symbols of the elements.Rajah 2 menunjukkan sebahagian daripada Jadual Berkala Unsur. Simbol P, Q, R, S dan T yang ditunjukkan tidak mewakili simbol sebenar unsur-unsur tersebut.

Diagram 2/ Rajah 2

(a) (i) State the electron arrangement of element R?Nyatakan susunan elektron bagi unsur R?

_________________________________________________________________[ 1 mark ](ii) Explain why element R and element S are in the same period.Terangkan mengapa unsure R dan unsur S berada dalam kala yang sama.__________________________________________________________________[ 1 mark ](b) (i) Which element is chemically unreactive?Unsur manakah yang tidak reaktif secara kimia?

__________________________________________________________________[ 1 mark ] (ii) Explain your answer in (b) (i).Terangkan jawapan anda di (b) (i).

__________________________________________________________________[ 1 mark ](c) (i) Compare the atomic size of R and S.Bandingkan saiz atom bagi R dan S.

__________________________________________________________________[ 1 mark ]

(ii) Explain your answer in (c) (i).Terangkan jawapan anda di (c) (i).

__________________________________________________________________

__________________________________________________________________[ 2 marks ](d) Element R react with element Q to form a compound.Write a chemical equation for the reaction.Unsur R bertindak balas dengan unsur Q untuk membentuk satu sebatian.Tuliskan persamaan kimia bagi tindak balas tersebut.

_____________________________________________________________________[ 2 marks ](e) Element P reacts with Q to form a compound. Draw the electron arrangement of the compound formed between element P and element Q.Unsur P bertindak balas dengan Q membentuk satu sebatian. Lukiskan susunan electron bagi sebatian yang terbentuk antara unasur P dan unsur Q.

[ 2 marks ]3. Diagram 3 shows two cells R and S.Rajah 3 menunjukkan binaan sel R dan S.

Diagram 3/ Rajah 3

(a) Based on cell R in the diagram 3, answer the following questions.Berdasarkan sel R dalam Rajah 3 , jawab soalan-soalan berikut.

(i) State the energy change in cell R.Nyatakan perubahan tenaga yang berlaku bagi sel R.

_______________________________________________________________[ 1 mark ](ii) Write the formulae of all the ions present in copper(II) sulphate solution.Tulis semua formula ion yang hadir dalam larutan kuprum(II) sulfat.

_______________________________________________________________[ 1 mark ](iii) Write the half equation for the reaction that occurs at the anode of cell R.Tuliskan setengah persamaan bagi tindak balas yang berlaku di anod sel R.

_______________________________________________________________[ 1 mark ](iv) State one observation that occurs at the anode of cell R.Nyatakan satu pemerhatian bagi tindak balas yang berlaku di anod sel R.

_______________________________________________________________[ 1 mark ](b) Based on cell S in diagram 3, answer the following questions.Berdasarkan sel S dalam Rajah 3, jawab soalan-soalan berikut.

(i) Show the direction of electrons flow in the circuit of cell S in diagram 3.Tunjukkan arah pengaliran electron dalam litar sel S dalam Rajah 3.

_______________________________________________________________[ 1 mark ](ii) Write overall ionic equation for the reaction.Tuliskan persamaan ion keseluruhan bagi tindak balas ini.

_______________________________________________________________[ 1 mark ](iii) What is the changes that will happen to the reading of the voltmeter if the zinc plate is placed with magnesium plate?Explain your answer.Apakah perubahan yang berlaku pada bacaan voltmeter sekiranya kepingan zink digantikan dengan kepingan magnesium?Jelaskan jawapan anda.

_______________________________________________________________

______________________________________________________________[ 2 marks ](iv) State two differences between cell R and cell S.Nyatakan dua perbezaan antara sel R dan sel S.Cell R/ Sel RCell S/ Sel S

[ 2 marks ]4. Diagram 4 shows the arrangement of atoms in two types of copper alloy.Rajah 4 menunjukkan susunan atom dalam dua jenis aloi bagi kuprum.

Diagram 4/ Rajah 4

(a) State the meaning of alloy.Nyatakan maksud aloi.

_____________________________________________________________________[ 1 mark ](b) State the name of alloy X.Nyatakan nama bagi aloi X.

_____________________________________________________________________[ 1 mark ]

(c) State the name of atom M.Nyatakan nama bagi atom M.

_____________________________________________________________________[ 1 mark ](d) (i) What is the difference in terms of hardness between bronze and pure copper?Apakah perbezaan daripada segi kekerasan antara gangsa dengan kuprum tulen?

__________________________________________________________________[ 1 mark ](ii) Complete Table 1 to show the differences in terms of size and arrangement of atoms in bronze and pure copper.Lengkapkan Jadual 1 untuk menunjukkan perbezaan daripada segi saiz dan susunan atom dalam gangsa dengan kuprum tulen.Difference/ PerbezaanBronze / GangsaPure copper/ Kuprum tulen

Size of atoms/ Saiz atom

Arrangement of atoms/ susunan atom

[ 2 marks ](iii) Describe what happens to the atoms when a force is applied to a bronze and pure copper.Huraikan apa yang akan berlaku kepada atom-atom apabila satu daya dikenakan kepada gangsa dan kuprum tulen.

Bronze/ gangsa:

_________________________________________________________________________

_________________________________________________________________________

Pure copper/ kuprum tulen:

_________________________________________________________________________

__________