Chemistry Spm Module SBP Collection

8/7/2019 Chemistry Spm Module SBP Collection

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MODUL 1

paper 3 questions

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1. A student carried out two experiments to determine the concentration of HX acid solution.

Seorang pelajar menjalankan dua eksperimen untuk menentukan kepekatan larutan asidHX.

Experiment I

Eksperimen I

Titration of HX acid solution of unknown concentration with 20cm3 of sodium hydroxide

solution 1.0 mol dm-3 using phenolftalein as indicator.

Pentitratan larutan asid HX yang tidak diketahui kepekatannya dengan 20cm3 larutannatrium hidroksida 1.0 mol dm-3 menggunakan penunjuk fenolftalein.

Experiment II

Eksperimen II

Titration of similar HX acid solution of difference concentration with 20cm3 of sodium

hydroxide solution 1.0 mol dm-3 using phenolftalein as indicator.

Pentitratan larutan asid HX lain yang tidak diketahui kepekatannya dengan 20cm3 larutanNatrium Hidroksida 1.0 mol dm-3 menggunakan penunjuk fenolftalein.

Diagram 1 shows the initial and final burette readings for both experiments.

Rajah 1 menunjukkan bacaan awal dan bacaan akhir buret bagi kedua-dua eksperimen.

Experiment 1

Eksperimen 1

Initial burette reading Final burette reading

Bacaan awal buret Bacaan akhir buret

Experiment II

Eksperimen II

2

20

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Initial burette reading Final burette reading

Bacaan awal buret Bacaan akhir buret

Diagram 1

Rajah 1

(a) Construct a table to record the initial and final burette readings and the volumes of the acid

used for both experiments.

Bina jadual dan catat bacaan awal dan bacaan akhir buret serta isipadu asid yangdigunakan bagi kedua-dua eksperimen di atas.

[ 3 marks]

(b) State the colour change of phenolftalein in the titration.

Nyatakan perubahan warna fenolftalein dalam titratan tersebut.

..

[3 marks]

(c) The chemical equation for the reaction in the experiment is :

Persamaan kimia bagi tindak balas dalam eksperimen ini ialah :

3

HX + NaOH NaX + H2O

25

16

15

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contain molten X at 95 oC was allowed to cool in a conical flask to room temperature.The

temperature of X was recorded every 30 seconds intervals.

Figure 2 shows the reading of the thermometer for this experiment.

Satu eksperimen telah dijalankan untuk menentukan takat beku cecair X. Satu tabung didih yang mengandungi leburan X pada suhu 95 oC diletakkan kelalang kon dan dibiarkanmenyejuk dalam keadan suhu bilik. Suhu direkod setiap 30 saat.

FIGURE 2

(a) Record the temperature at each time interval in the spaces provided in Figure 2.

Catatkan bacaan suhu bagi setiap sela masa dalam ruangan yang disediakan dalamrajah 2.

[ 3 marks ]

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

X.

Pada kertas graf di bawah, lukiskan graf suhu melawan masa bagi penyejukan X[ 3 marks ]

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(c) On the graph in (b), determine the freezing point of X.

Show on the graph how you determine this freezing point.

Pada graf di(b) tentukan takat beku X. Tunjukkan pada graf bagaimana anda tentukantakat beku.

[ 3 marks ]

(d ) How does the graph in (b) show the freezing point of X ?

Pada graf di(b)bagaimanakah ia menunjukkan takat beku X.

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

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

[ 3 marks ]

(e) The temperature of X did not change from the 90th second until the 150th second

duringthe cooling process. Expalain why.

Suhu X tidak berubah dari saat ke 90 hingga saat ke 150 semasa process penyejukan.Terangkan mengapa.

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

.

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

.

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

.[ 3 marks ]

(f) Why was the boiling tube placed in the conical flask during the cooling process?

Mengapakah tabung didih diletakkan dalam kelalang kon semasa proses penyejukan?

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

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

............................................................................................................................................[ 3 marks ]

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3. A student carried out an experiment to investigate the effect of heat on lead (II) nitrateand zinc carbonate salt. The released gas is passed through into the lime water.

Figure 3 below shows the set-up of apparatus for heating lead(II) nitrate and zincnitrate.

Lead(II) carbonate Zinc carbonate

Earlier experiment

(white solid)

Final experiment

Residue (brown solid) Residue (yellow solid)

Figure 3

(a) Complete the following table by stating the observations and related inferences

for heating of lead(II) carbonate salt.Observations Inferences

i) ...

...

i) ...

..

ii) .. ii) .

8

Lime water

(white solid)

Heat

Lime water

Heat

Lime water

Heat

Heat

Lime water


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.. ..

[3 marks]

(b) State the hypothesis for the experiment.

..[3 marks]

(c) Write the chemical equation for the effect of heat on lead(II) carbonate.

.

[3 marks]

(d) The residue of heating lead(II) carbonate salt is dissolved in the dilute nitric acid.

After that, the solution is added with the excess sodium hydroxide solution.

State the observation.

[3 marks]

(e) 2.67 g of lead(II) carbonate decomposed completely when it is heated.

Calculate the number of moles of gas released.

[ Relative molecular mass of lead(II) carbonate, 267]

[3 marks]

(f) Name the products when zinc carbonate is heated.

[3 marks]

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4.

Using the suitable materials and apparatus, plan a labotary experiment to compare

the electrical conductivity between the compounds of X and Y.

Your explaination should include all the followings:

(a) Statement of the problem

(b) All the variables

(c) List of materials and apparatus

(d) Procedure

(e) Tabulation of data

[ 17 marks ]

10

A student is given an ionic compound X and covalent compound Y.


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MODUL 2

SOLVING NUMERICALPROBLEMSINVOLVING

CHEMICAL EQUATION

Things to remember !!!

(A)

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(B) No. of moles =Molarmass

gMass )(

(C) No. of particles = No. of moles x NA

(D) Volume of gas = No. of moles x Molar volume

(E) No. of moles =1000

MV

Notes

(i) Molar mass = relative atomic mass orrelative molecular mass of the substance

(ii) NA = Avogadro constant, 6.02 x 1023

(iii)Molar volume = 22.4 dm3 at STP or24 dm3 at room conditions

NUMERICAL PROBLEMS INVOLVING CHEMICAL EQUATIONS

Step 1 : Write a balanced chemical equation

Step 2 : Identify substances involved in the calculation, A and B

Step 3 : Convert the given information (mass/volume of gas/number of particles) of A

IONIC FORMULAE

Cations(+)

Anions(-)

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into the number of moles

Step 4 : Compare the mole ratio of A and B from the chemical equation

Step 5 : Calculate the number of moles of B based on the mole ratio in the equation

Step 6 : Convert the number of moles of B to the unit required in the question

EXAMPLE 1

Calculate the mass of zinc required to react with excess hydrochloric acid to produce 6 dm3 of

hydrogen gas at room conditions. [RAM: Zn,65; Cl,35.5; Molar volume: 24 dm 3mol-1 at room

conditions]

13

Mass (g)

Concentration

ofsolution (mol/dm3)

and volume

NO. OFMOLES

Volume

ofgas

No. of

particles

NAx NA

x RAM @ RMM RAM @ RMM

x 24 dm3 @ 22.4 dm3

24 dm3 @ 22.4 dm3

n = MV

1000


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Step 1 : Zn + 2HCl ZnCl2 + H2

Step 2 : mass? 6 dm3

Step 3 : No. of moles of H2 = 6 dm3

24 dm3

= 0.25 mol

Step 4 : 1 mol of H2 1 mol of Zn

Step 5 : 0.25 mol of H 0.25 mol of Zn

Step 6 : Mass of Zn = 0.25 x 65

= 16.25 g

EXAMPLE 2

0.46 g of sodium burns completely in chlorine gas at room conditions. Find the volume of

chlorine gas. [RAM: Na, 23; Molar volume: 24 dm3 mol-1 at room conditions]

Step 1 : 2Na + Cl2 2NaCl

Step 2 : 0.46g volume?

Step 3 : No. of moles of Na = 0.46

23= 0.02 mol

Step 4 : 2 mol of Na 1 mol of Cl2

Step 5 : 0.02 mol of Na 0.01 mol of Cl2

Step 6 : Volume of Cl2 = 0.01 x 24

= 0.24 dm3

EXERCISES

1. 2.3 g of element X reacted completely with oxygen. The following equation represents the

reaction.

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5. When 10 cm3 of 0.5 mol dm-3 sodium sulphate solution is added to excess lead (II) nitrate

solution, a white precipitate is formed.

Calculate the mass of precipitate formed. [Relative atomic mass: O=16, S=32, Pb=207]

6. Excess calcium carbonate reacts with 25 cm3 of 0.15 mol dm-3 hydrochloric acid. Calculate

the volume of carbon dioxide gas released at room conditions.

[Molar volume: 24 dm3 mol-1 at room condition]

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MODUL 3

Atomic structure and

chemical formulae andequations

1. The following is information about substance X.

Maklumat berikut ialah tentang bahan X

17

Solid at room temperature

Pepejal pada suhu bilik

Melting point is 80 0C

Takat lebur ialah 80 0C

Highly flammable.

Mudah terbakar


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[ 2 marks]

(e) Sketch a graph of temperature against time during the heating. Mark on the graph to

indicate the melting point of substance X.

Lakarkan graf suhu melawan masa semasa pemanasan. Tandakan pada graf untuk

menunjukkan takat lebur bahan X.

[ 3 marks]

(f) Suggest the name of substance X.

Cadangkan nama bahan X.

[ 1 mark]

2. Table 2 shows proton number and nucleon number for atom W, Xand Y.

Jadual 2 menunjukkan nombor proton dan nombor nukleon bagi atom W, X dan Y.

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[1 mark]

(b) What is the function of anhydrous calcium chloride?

Apakah fungsi kalsium klorida kontang?

[1 mark]

(c) How to ensure that the combustion tube has been totally filled with hydrogen gas?

Bagaimana untuk memastikan bahawa tiub pembakaran telah dipenuhi dengan gas

hidrogen?

[2 marks]

(d) Based on the above results,

Berdasarkan keputusan di atas,

(i) Calculate the mass of copper and the mass of oxygen that have reacted.

Hitungkan jisim kuprum dan jisim oksigen yang bertindak balas.

[1 mark]

(ii) Calculate the mole ratio of copper atoms to oxygen atoms.

Hitungkan nisbah mol bagi atom kuprum kepada atom oksigen.

[ Relative atomic mass /Jisim atom relatif: O = 16 ; Cu = 64 ]

[1 mark]

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(iii) Determine the empirical formula of copper (II) oxide.

Tentukan formula empirik kuprum (II) oksida.

..

[1 mark]

(iv) Write the chemical equation for the reaction in the experiment.Tulis persamaan kimia bagi tindak balas dalam eksperimen tersebut.

..

[1 mark]

(e) Does this method suitable to determine the empirical formula of aluminium oxide?

Explain your answer.

Adakah kaedah ini sesuai untuk menentukan formula empirik bagi aluminium oksida.Jelaskan jawapan anda.

[2 marks]

4. The following equation is not balanced :

Persamaan berikut adalah tidak seimbang :

Na2SO4 + BaCl2 BaSO4 + NaCl

(a) Identify the reactants and products of the reaction.

Kenal pasti bahan tindak balas dan hasil tindak balas bagi tindak balas tersebut.

Reactants/Bahan tindak balas :

Products/Hasil tindak balas : .

[ 2 marks]

(b) Write the balanced equation.

Tuliskan persamaan yang seimbang

...

[ 1 mark]

(c) Calculate/Hitungkan :

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(i) the number of mole of sodium sulphate that react completely with a solution

containing 4.16gof barium chloride[Relative atomic mass : Cl = 35.5; Ba = 137 ]

bilangan mol natrium sulfat yang bertindak balas lengkap dengan suatu larutanyang mengandungi 4.16 g barium klorida[Jisim atom relatif : Cl = 35.5; Ba = 137 ]

[ 2 marks]

(ii) the mass of barium sulphate formed when 1 mol of sodium sulphate is reactedcompletely with barium chloride.

[Relative atomic mass : O = 16; S = 32; Ba = 137 ]

Jisim barium sulfat yang terbentuk apabila 1 mol natrium sulfat bertindak balaslengkap dengan barium klorida.[Jisim atom relatif : O = 16; S = 32; Ba = 137 ]

[ 2 marks]

(d) In an experiment, when chlorine gas is passed over heated iron wool, a chloride

compound with 34.5 % iron by mass is formed. Determine the empirical formula of the

chloride compound.

[Relative atomic mass : Cl = 35.5; Fe = 56 ]

Dalam satu eksperimen, apabila gas klorin dialirkan melalui wul besi yang panas, suatu sebatian klorida yang mengandungi 34.5% besi mengikut jisim terbentuk. Tentukanformula empirik bagi sebatian klorida tersebut.[Jisim atom relatif : Cl = 35.5; Fe = 56 ]

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The result for above experimet is as the following:

Keputusan yang diperoleh dalam eksperimen adalah seperti berikut:

Mass of combustion tube + porcelain dish

Jisim tabung pembakaran + piring porselin = 52.45 g

Mass of combustion tube + porcelain dishJisim tabung pembakaran + piring porselin + oksida logam L = 105.97 g

Mass of combustion tube + porcelain dish

Jisim tabung pembakaran + piring porselin + logam L = 102.13 g

Table /Jadual5

(i) Based on the information in Table 7.3, determine the empirical formula of L

oxide.

Berdasarkan maklumat di atas tentukan formula empirik bagi oksida L

[Relative atomic mass / jisim atom relatif: L = 207, O = 16] [3 marks]

(ii) Write the chemical equation for the reaction occurred.

Tuliskan persamaan kimia bagi tindak balas yang berlaku.[2 marks]

(iii) How do you know that the air in the combustion tube has been removed

completely before heating?

Bagaimanakah anda tahu bahawa semua udara telah disingkirkan daripada

tabung pembakaran sebelum pemanasan?[3 marks]

(iv) Table 7.4 shows the metals and suitable method to determine their metal oxideempirical formula.

Jadual7.4 menunjukkan logam-logam dan kaedah yang sesuai untukmenentukan formula empirik oksida logam masing-masing.

Metal

Logam

Method

Kaedah

L and copper

L dan kuprum

Dry hydrogen gas is flow to hot metal oxide.

Gas hidrogen kering dialirkan pada oksida

logam yang panas.

Magnesium Metal is burnt in air.Logam dibakar dalam udara.

Table /Jadual7.4

Explain why the methods are different?

Terangkan mengapa terdapat perbezaan kaedah itu?[2 marks]

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(c) 2H2(g) + O2(g) 2H2O()

(i) State three informations that you can predict from the above equation.

Nyatakan tiga malumat yang anda dapat tafsirkan daripada persamaan di atas.[3 marks]

(ii) Based on the equation, calculate the volume of oxygen gas needed to produce 18

g of water at STP.

Berdasarkan persamaan kimia di atas, hitungkan isipadu gas oksigen pada STPyang diperlukan untuk menghasilkan 18 g air.

[Relative atomic mass /Jisim atom relatif: H = 1, O = 16 ][Molar volume of gas at STP /Isipadu molar gas pada STP = 22.4 dm3]

[4 marks]

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MODUL 4

Periodic table andchemical bonds

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1. Diagram 1 shows the symbols of atom for element U, V, W and X.

Rajah 1 menunjukkan simbol- simbol atom bagi unsurU, V, W dan X.

U7

3 V

12

6 W

19

9 X

20

10

DIAGRAM /RAJAH1

(a) Write the electron arrangement of atom W.

Tuliskan susunan elektron bagi atom W.

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

.......

[1 mark]

(b) (i) Element U, V, W and X are placed in the same period in the Periodic Table.

State the period.

UnsurU, V, W dan X beradadalam kala yang sama dalam Jadual Berkala.Nyatakan kala itu.

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

[1 mark]

(ii) Compare the atomic size of element V and X.

Bandingkan saiz atom unsurV dan X.

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

[1 mark]

(iii) Explain your answer in (b) (ii)

Terangkan jawapan anda dalam (b) (ii).

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

.

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

. [2 marks ]

(c) Element V can react with element W to form a compound.

UnsurV boleh bertindak balas dengan unsurW membentuk satu sebatian.

(i) Write the chemical formula for the compound.

Tuliskan formula kimia bagi sebatian itu.

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

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[1 mark]

(ii) State one physical property for the compound formed.

Nyatakan satu sifat fizikal bagi sebatian yang terbentuk.

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

[1 mark]

(d) When element U react with element W, a compound is produced.

Apabila unsurU bertindak balas dengan unsurW, satu sebatian terhasil.

(i) State the type of the compound produced.

Nyatakan jenis sebatian yang terhasil.

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

[1 mark]

(ii) Draw the electron arrangement for the compound in (d) (i).

Lukiskan susunan elektron bagi sebatian dalam (d) (i).

[2 marks]

2. Table 2 shows the proton number of a few elements in Period 3.

Jadual2 menunjukkan nombor proton bagi sebahagian unsur dalam Kala 3.

Element

UnsurSodium Magnesium Aluminium Chlorine Argon

Proton number

Nombor proton11 12 13 17 18

TABLE /JADUAL 2

Based on Table 2, answer the following questions :Berdasarkan Jadual2, jawab soalan-soalan berikut:

(a) Name two metals.

Namakan dua logam.

[1 mark]

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3. Figure 3 showsthe symbol for an atom of element X and an atomof elementY

Rajah 3 menunjukkan simbol bagi atom unsur X dan atom unsur Y.

FIGURE / RAJAH 3

Based on Figure 3, answer the following questions.

Berdasarkan Rajah 3 , jawab soalan-soalan berikut.

(a) (i) Write the electron arrangement for an atom of element X .

Tuliskan susunan elektron bagi atom unsur X.

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

[ 1 mark](ii) State the group of element X in Periodic Table.

Nyatakankumpulan bagi unsur X dalam Jadual Berkala

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

[ 1 mark]

(iii) State the period of element X in Periodic Table.Explain your answer.

Nyatakan kala bagi unsur X dalam Jadual Berkala.Terangkan jawapan anda.

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

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

[ 2 marks ]

(b) (i) What is the number of neutron in an atom of element Y.

Berapakah bilangan neutron dalam atom unsur Y

..................................................................................................................................[ 1 mark]

(ii) Write the formula for the ion formed from an atom of element Y.

Tuliskan formula ion yang terbentuk daripada atom unsurY.

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

[ 1 mark]

32

23

X11

35

Y17


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(c ) (i) Draw the electron arrangement of compound formed from the reaction of

element X and element Y.

Lukiskan susunan elektron bagi sebatian yang terbentuk daripada unsur X

dengan unsur Y.

[ 2 marks ]

(ii) State the type of bond formed between element X and element Y.

Nyatakan jenis ikatan yang terbentuk antara unsur X dan unsur Y.

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

[ 1 mark]

(iii) State one property of the compound formed between element X and element Y.

Nyatakan satu sifat fizik sebatian yang terbentuk itu antara unsur X dan unsur Y.

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

[ 1 mark]

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1. Figure 1.1 shows the set-up of apparatus to investigate the electrolysis of 1.0 mol dm -3

copper(II)sulphate solution using carbon electrode.

Rajah 1.1 menunjukkan susunan radas untuk mengkaji elektrolisis larutan kuprum(II) sulfat1.0 mol dm-3 menggunakan elektrod karbon.

FIGURE /RAJAH1.1

(a) (i) What is meant by electrolysis?Apakah yang dimaksudkan dengan elektrolisis ?

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

[1mark]

(ii) What is the energy change that occurs in the electrolysis process?

Apakah perubahan tenaga yang berlaku dalam proses elektrolisis.

..

[1 mark]

(b) State all the ions present in copper (II) sulphate solution.

Nyatakan semua ion yang hadir dalam larutan kuprum(II)sulfat.

...

[ 1

mark]

(c ) (i) State an observation at electrode T.

Nyatakan satu pemerhatian di elektrod T.

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1.0 moldm -3copper(II)sulphateCarbon electrode U

Carbon electrode T

A


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..

[ 1 mark]

(ii) Write the half equation of the reaction at electrode T.Tuliskan setengah persamaan bagi tindak balas yang berlaku di elektrod T.

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

[ 1 mark]

(d ) What is the colour change of the copper (II) sulphate solution?Explain your answer.

Apakah perubahan yang berlaku kepada warna larutan kuprum(II)sulfat?Terangkanjawapan anda.

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

.

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

.

[ 2 marks ]

(e) (i) Name the gas collected in the test tube at electrode U.

Namakan gas yang terkumpul dalam tabung uji di elektrod U.

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

[ 1 mark]

(ii) The volume of gas collected at electrode U is 15.0cm3.How many moles of the gas were collected? Use the information that 1 mole of

gas occupies a volume of 24.0 dm3 at room temperature and pressure.

Isipadu gas yang dikumpul di elektrod U ialah 15.0cm 3. Berapakah bilangan mol

gas yang terbebas. Gunakan maklumat 1 mol gas menempati isipadu 24.0 dm3

pada suhu dan tekanan bilik

[ 1 mark]

(f) An experiment has been carry out to investigate the position of copper in electrochemical

series using set-up of apparatus as in figure 1.2.

Satu eksperimen lain telah dijalankan untuk mengkaji kedudukan kuprum dalam SiriElektrokimia menggunakan susunan radas seperti Rajah 1.2.

.

37

Copper(II)nitrate solution /Larutan kuprum(II) nitrat

Copper plate / kepingan kuprumMetal plate

/kepingan logam


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FIGURE /RAJAH1.2

If the metal plate is replaced by metal X ,Y and Z that are dipped consecutively, the

potential difference produced is shown in Table 1.1.

Jika kepingan logam digantikan dengan logam X , Y dan Z yang dicelupkan secaraberasingan, beza keupayaan yang terhasil ditunjukkan dalam Jadual 1.

Metal plate

Kepingan logam

Potential difference (V)

Beza keupayaan (V)

Positive terminal

Terminal positif

X 0.5 Copper /KuprumY 1.2 Copper /Kuprum

Z 2.7 Copper /Kuprum

Table / Jadual1.1

Based on the result, arrange metals copper, X, Y and Z in descending order of

electropositivity of metals.

Berdasarkan keputusan di atas, susunkan logam-logam kuprum , X ,Y dan Z mengikutsusunan tertib menurun keelektropositifan logam.

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

. [ 1 mark]

2. TheFigure 2 shows a simple chemical cell.

Rajah 1.3 menunjukkan sebuah sel kimia ringkas.

Table 2 shows the voltage value and the positive terminal when different metals are used as

the electrode R.

38

Copper electrode

Elektrod kuprumElectrode R

ElektrodR

Copper(II) sulphate solution

Larutan kuprum(II) sulfat

Figure /Rajah 2

v


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Jadual2 menunjukkan nilai voltan dan kutub positif apabila logam berlainan digunakansebagai elektrodR.

Metal

Logam

Voltage value (V)

Nilai voltan (V)

Positive terminal

Kutub positif

V 1.1 Copper /Kuprum

W 2.7 Copper /Kuprum

X 0.5 Copper /Kuprum

Y 0.8 Copper /Kuprum

Z 0.0 -

Table /Jadual2

(a) State the energy change that occurred in the chemical cell.

Nyatakan perubahan bentuk tenaga yang berlaku dalam sel ringkas itu.

[1 mark]

(b) (i) State all the ions presence in copper(II) sulphate solution.

Nyatakan semua ion yang terdapat dalam larutan kuprum(II) sulfat.

......

[1 mark]

(ii) The colour of the copper(II) sulphate is blue. State the ion in (b) (i) that gives the

colour of the solution. Larutan kuprum(II) sulfat berwarna biru. Nyatakan ion di (b) (i) yang

memberikan warna biru itu kepada larutan tersebut.

......

[1 mark]

(c) Based on the simple cell using copper metal and V,

Berdasarkan sel ringkas yang menggunakan logam kuprum dan V,

(i) State the direction of electron flow

Nyatakan arah pengaliran electron

......

[1 mark]

(ii) Explain your answer in (c) (i)

Terangkan jawapan anda di (c)

..........

[1 mark]

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(iii) State the observation at copper electrode.

Nyatakan pemerhatian di elektrod kuprum.

..........[1 mark]

(iv) Write the half equation to that occured at copper electrode.

Ttuliskan setengah persamaan bagi mewakili tindak balas yang berlaku dielektrod kuprum.

......

[1 mark]

(d) (i) Arrange metals V, W, X and Y in the electrochemical series in descending order.

Susunkan logam-logam V, W, X dan Y dalam siri elektrokimia mengikut tertib

menurun.

......

[1 mark]

(ii) If metal X and metal Y are used as the electrodes in simple cell in Diagram 2,

suggest the possible voltage value of the cell.

Jika logam X dan logam Y dijadikan sebagai elektrod-elektrod dalam sel

ringkas pada Rajah 2, cadangkan nilai voltan yang mungkin sel ringkas itu.

..........

[1 mark]

(iii) Predict metal Z.

Ramalkan logam Z.

..........

[1 mark]

3. Diagram 3 shows two types of cells, cell A and cell B.

Rajah 3 menunjukkan dua jenis sel , selA dan selB.

40

Zinc

Zink


41/42

Cell A Cell B

SelA SelB

DIAGRAM/RAJAH3

(a)State the energy change in cell A.

Nyatakan perubahan tenaga dalam selA .

....

[ 1 mark]

(b) Mark / Tandakan(i) the positive and negative terminal on the electrode in cell A

terminal positif dan terminal negatif pada elektrod dalam selA

[ 1 mark]

(ii) the direction of electron flow in cell B by drawing an arrow.

arah pengaliran elektron dalam selB dengan melukis anak panah .[ 1 mark]

(c) Zinc in cell B acts as anode. Explain why.

Zink dalam selB bertindak sebagai anod.Terangkan mengapa.

[ 1 mark]

(d) Referring to the positive electrode of cell A,Dengan merujuk kepada elektrod positif selA,

(i) state the observation you would expect.

nyatakan pemerhatian yang anda jangkakan.

.

.

[ 1 mark]

41

Copper

Kuprum

Copper(II)

sulphate solution

Larutan

Kuprum(II)sulfat


42/42

(ii) Write the half equation for the reaction.

Tuliskan setengah persamaan bagi tindak balas yang berlaku.

..

[ 1 mark]

(e) Explain what will happen to the concentration of copper(II) sulphate solution in cell A.

Terangkan apa yang berlaku pada kepekatan larutan kuprum(II)sulfat dalam selA.

...

[ 2 marks ]

(f) (i) The voltage for the pair of copper and zinc metal in cell B is 1.1 V. Predict the

voltage if zinc metal is replaced by magnesium metal.

Bacaan voltan bagi pasangan logam kuprum dan zink dalam sel B ialah 1.1V. Ramalkan bacaan voltan sekiranya logam zink digantikan dengan

logam magnesium.

..

[ 1 mark](ii) Explain your answer in (f) (i).

Terangkan jawapan anda di (f) (i).

..

[ 1 mark]

Chemistry Spm Module SBP Collection

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