Spm Percubaan 2008 Kedah Chemistry Paper 3

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454113 Kimia Kertas3

Sept. 2008

No. Kad Pengenalan:

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Angka Giliran:

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Nama:

Tingkatan:

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PERSIDANGAN KEBANGSAAN PENGETUA-PENGETUA SEKOLAH MENENGAH NEGERI KEDAH DARUL AMAN

PEPERIKSAAN PERCUBAAN SPM 2008 CHEMISTRY

Paper 3

One hour and thirty minutes

JANGAN BUKA KERTAS SOALAN INI SEHINGGA DffiERITAHU

1. Kertas soalan ini adalah da/am dwibahasa. 2. Soalan dalam Bahasa Inggeris meildahuIui soalan yang sepadan da/am Bahasa Me/ayu. 3. Calon dibenarkan menjawab leese/uruhan atau sebahagiansoalan sama ada da/am Bahasa Inggeris atau Bahasa Me/ayu.

4. Calon dileehendald membaca maklumatdi halaman belakangkertas

Untuk Keguriaan Pemeriksa

Soalan

Markah Markah' penuh diperoleh

1

33

2

17

JUMLAH

soa/an ini.

Kertas soalan ini mengandungi 10 halaman bercetak

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INFORMATION FOR CANDIDATES 1. This question paper consists oftwo questions. Answer all the questions. 2. Write your answers for Question J and Question 2 in the spaces provided in the question paper. 3. You may use equations, diagrams, tables, graphs and other suitalJle methods to . explain your answer. 4. If you wish to cancel any answer, neatly cross out the answer. Then write down the new answer. 5. Show your working. It may help you to get marks. 6. The diagrams in the questions are not drawn to scale unless stated 7. Marks allocatedfor each question or part ofthe question are shown in brackets. 8. The time suggested for answering Question 1 is 45 minutes and Question 2 is 45 minutes. 9. You may use a non-programmable scientific calculator. 10. Hand in all your answer sheets at the end ofthe examination.

Marks awarded:

Mark

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Description Excellent: The best response

2

Satisfactory : An average response

1

Weak: An inaccurate response

0

No response or wrong response

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3 Answer all the questions.

Jawab SenllUl soalan.

The timesuggested for answering Question 1 is 45 minutes. Masayang dicadangkan untulc menjawab Soalan 1 ialah 45 minit.

1 A student carried out an experiment to construct the electrochemleal series by measuring the voltage of copper and metal T in a simple voltaic cell as shown in Diagram 1.1. The experiment is repeated by replacing metal T with metals P, Q, R and

S. Seorang pelajar telah menjalankan suatu elrperimen untuk membina siri elektrokimta

dengan mengukur voltan antara logam kuprum dan logam T dalam sebuah sel

. ring/cas seperti yang ditunjulclran dalam Rajah 1.1. Ekperimen itu diulang beberapa

/rali dengan menggantikan logam T dengan logam P, g, R dan S.

T Copper(II) sulphate solution Larutan kuprum(ll) sulfat

DIAGRAM 1.1 RAJAH 1.1 The voltmeter readings for each pair of metals are shown in Diagram 1.2 Bacaan voltmeter bagi setiap pasangan logam ditunjulckan dalam Rajah 1.2

Cu andQ

Cu and P

Cuand T

Cu and S

DIAGRAM 1.2

RAJAH 1.2

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(a) Based on Diagram 1.2, record the voltmeter readings for each pair of metals in Table 1.1. Berdasarkan Rajah 1.2. rekodkan bacaan voltmeter bag; setiap pasangan logam dalam Jadual 1.1.

Pair of metals

Negative terminal

Voltage/V

Pasangan logam

Terminal negatif

Voltanl V

Cuand P

P

Cuand Q

Q

Cu and R

Cu

Cu and S

S

Cuand T

Cu TABLE 1.1 JADUAL 1.1

[3 mara]

(b) Based on the voltmeter readings, arrange the metals Cu, P, Q, R, Sand Tin descending order ofelectropositivity. Berdasarkan bacaan voltmeter, susun logam-logam cu. P, Q, R, S dan T dalam tertib keelektropositifan logam secara menurun.

Descending order of electropositivity of metal, Susunan keelektropositifan logam secara menurun.

[3 mara]

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(c) Complete Table 1.2 for the experiment.

Leng1cap1can Jadual 1.2 bag!experiment inf.

Variables Pembolehubah (i) Manipulated variable: Pembolehubah dimanipulasi:

Action to be taken Tindakan .,anl! Derlu diambU (i) The way to manipulate variable: Cara pembolehubah dimanjpulasi1can:

.................................................................. .................................................................. .(ii) Responding variable:

Pembolehubah bergerakbalas:

(ii) What to observe in the responding variable: Apa yang diperhatiJran poda

pembolehubah bergerakbalas:

(iii) Controlled variable: Pembolehubah dimalarkan:

(iii) The way to maintain the controlled

variable: Cara untuk menetapkan pembolehubah yang dimalarkan:

TABLE 1.2 JADUAL 1.2

[6marh]

(d) State a hypothesis for this experiment.

Nyatakan satu hipotesis untuk eksperimen ini.

[3 maries]

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(e) State three observations and corresponding inferences that can be obtained from the cell in Diagram 1.1(Cu and metal T).

Nyatakan tiga pemerhatian dan inferens yang sepadan yang boleh diperoleh. dartpada sel dalam Rajah 1.1(eu dan logam T). Observation

Inference Interens

Pemerhatian I

" " " " " " """"" " "" " " " " " . "" "" """ "" " " "" " "" """" ""

..

]

"" . "" "" . """" ,," " ...... "" " .... " ""

.......... " . " .... "" . ":,,

..

•..........................•.•••.....••.••.•..

..•...•..•.......••..•..•.••••.•.•••••........

...... " " " .... " " .. " ..... "" .. " " . " "" " " . " . " . " ......

..•.......•....................•..••.•••••.•..

2 •...................•..•.........••.......•.

2 •...•..............•...•..•......•.....•....

.... " "" " . " ........ " """" " " .... "" " . "" " .... "

...............•.......••..........•••........

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

..............••••......•............•......••

3 .•...•.....••••...•......•.•..•.......•..•..

3 ............................................

.................. ...•....•.••.....••..••••..

.•••.•....•.•....•....•.•..•....•.••.•.••.....

.••.••..•.••...••.••...••..•...•..••••......•.

.•.•.......••....•..•.•.•....•••...•.••..••.•.

..

"" " " "" " " ""

""" " . " " "" . "" " "" ""

.... "" " "" " . "" "

~

[6 mara]

(1) Predict the voltage ofthe cells which contain the following pair of metals.

Ramalkan voltan sel yang memJJ!lnyai pasanganlogam yang beriku: Pair of metals

Voltagel V

PtlSangan logam

VoltanIV

PandS PandT QandR

[3 mara]

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(g) Classify metals P, Q, R, S and T into more electropositive than copper and less electropositive than copper. Write your answers in the table provided. Kelaskan logam-logam P. Q. R, S dan T kepada yang lebih eleksropositif daripada kuprum dan kurang elekiropostttfdaripada kuprum. Tuliskan jawapan anda dalam jadual yang disediakan.

[3 marks] (h) Explain why the voltage of cell consist of copper and metal S is larger than the cell consist of copper and metal P. Terangkan mengapa nilai voltan sel yang mengandungi kuprum dan logam S lebih besar daripada selyang mengandungi kuprum dan logam P.

..... .

. ..

..,.

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.

[3 marks] . . . (i) Another example of a chemical cell is Daniell Cell. Draw the apparatus set-up of a Daniell Cell consisting copper and metal T. Contoh lain bagi satu sel kimia ialah Sel Daniell. Lukiskan susunan radas bag; satu Sel Daniell yang mengandungi kuprum dan logam T.

[3 marh]

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2. Lithium. sodium and potassium are three elements in Group I of the Periodic Table. These three elements show different reactivity in their reactions with water. Litium, natrium dan kalium adalah tiga unsur Kumpulan J dalam Jadual Berkala.

Tiga unsur int menunjukan kereaktifan berbezadalam tindak balas dengan air. Plan an experiment to compare the reactivity of these three elements when reacting with water.

Rancang saw eksperimen untuk membandingkan kereaksifan ketiga-tiga unsur tersebut apabila bertindak balas dengan air. Your planning must include the following items:

Perancangan anda haruslah mengandungiaspek berikut: (a) Problem statement

Pernyataanmasaalah (b) Hypothesis

Hipotesis (c) All the variables

Semua pembolehubah (d) Lists of materials and apparatus

Senarai bahan dan alat rodas (e) Procedure

Prosedur (t) Tabulation of data

Penjadualan data [17 marks]

END OF QUESTION PAPER

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PEPERIKSAAN PERCUBAAN SPM 2008 NEGERI KEDAH DARUL AMAN MARKING SCHEME CHEMISTRY PAPER 3 Section A

Question

1 (a)

Explanation

Maximum score

[Able to record all the five readings accurately]: Suggested answer: Pairs of electrodes

Voltage/V

Cu and P

1.5

Cu and Q

1.8

Cu and R

0.6

Cu and S

2.3

Cu and T

1.2

[Able to record any 4 readings accurately] [Able to record any 3 readings accurately] [No response given or wrong response] Question

1 (b)

Explanation [Able to arrange the position of all metals in descending order of electropositivity correctly]

3

2 1 0 Maximum score 3

Suggested answer: S, Q, P, Cu, R, T [Able to arrange the position of at least four metals in descending order of electroposivity correctly] [Able to arrange the position of at least two metals in descending order of electroposivity correctly] [No response given or wrong response]

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Question

1 (c)

Explanation

Maximum score

[Able to state three variables and the way to control them correctly] Suggested answer: Manipulated variable:

Substituting the electrode T with different metals

Pair of metals

Reading of the voltmeter// voltage

Responding variable: Voltmeter reading

6

Controlled variable: Electrolyte//copper(II) sulphate Use the same concentration of solution//concentration and electrolyte/CuSO4 //use the same voltmeter//use copper electrode in volume of electrolyte//same all experiments. voltmeter//copper electrode [Able to state any 5 of the above information correctly] [Able to state any 4 of the above information correctly ] [Able to state any 3 of the above information correctly] [Able to state any 2 of the above information correctly ] [Able to state any 1 of the above information correctly ] [No response given or wrong response] Question

1 (d)

Explanation

5 4 3 2 1 0 Maximum score

[Able to state the relationship between the manipulated variable and the responding variable and the direction correctly] Suggested answer:The further the distance of the pair of metals in the electrochemical series the higher is the voltage / the voltmeter reading

3

[Able to state the relationship between the manipulated variable and the responding variable in general] Suggested answer:

2

The position of the metal in the electrochemical series affects the reading of the voltmeter// the higher the position of the metal in the electrochemical series, the bigger/ higher is the voltage/ the voltmeter reading. [Able to state an idea of hypothesis] Suggested answer:

1

The electrochemical series is determined by the voltage value//Different metals give different voltage values. [No response given or wrong response]

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Question 1(e)

Explanation

Maximum score

[Able to state three observations and three inferences correctly]

Observation

Inference

1. copper strip/rod/metal dissolves/ becomes thinner

Copper is oxidised/ loses electron to form copper(II) ion

2. Brown solid is deposited at metal T

Copper is formed

3. The intensity of blue coloured solution remains unchanged

The concentration of Cu2+ in the solution remain unchanged

[Able to state any five of the above information correctly] [Able to state any four of the above information correctly] [Able to state any three of the above information correctly] [Able to state any two of the above information correctly] [Able to state any one of the above information correctly] [No response given or wrong response] Question 1(f)

Explanation

6

5 4 3 2 1 0 Maximum score

[Able to predict the voltage of the three cells accurately] Suggested answer:

Pair of metals

Voltage/ V

P and S

0.8

P and T

2.7

Q and R

2.4

[Able to predict the voltage of any two cells accurately] [Able to predict the voltage of any one cell accurately] [No response given or wrong response]

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Question 1(g)

Explanation

Maximum score

[Able to classify all the metals correctly] Suggested answer:

More electropositive

Less electropositive R, T

P, Q, S

2

[Able to classify three metals correctly] [Able to classify two metals correctly]

1 0

[No response given or wrong response] Question 1(h)

3

Explanation

Maximum score

[Able to explain the difference in the voltage of the cell] Suggested answer:

3

The distance between Cu and metal S is further than the distance between Cu and metal P in Electrochemical Series. The distance between Cu and metal S is further than the distance between Cu and metal P.. S is more electropositive than P [No response given or wrong response]

Question 1(i)

Explanation

2 1 0

Maximum score

[Able to draw the labeled apparatus set-up completely] Suggested answer:

Copper

Metal T

Copper(II) sulphate solution

T nitrate solution

3

Salt bridge [Able to draw the labeled apparatus set-up incompletely] [Able to draw the apparatus completely without label] [No response given or wrong response]

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Question 2(a)

Explanation

Maximum score

[Able to write the problem statement of the experiment accurately.] Sample answer: How do lithium, sodium and potassium differ in reactivity with water?

3

[Able to write the problem statement of the experiment correctly.] Sample answer: How do lithium, sodium and potassium differ in reactivity?

2

[Able to write a relevant idea about the problem statement of the experiment//Able to write aim of experiment accurately.] Sample answer: How do lithium, sodium and potassium differ?//To compare the reactivity of lithium, sodium and potassium when react with water.

1

[No response given or wrong response]

0

Question 2(b)

Explanation

Maximum score

[Able to state the hypothesis accurately] Suggested answers: The reactivity of lithium, sodium and potassium towards water increases down the group // The reactivity of lithium, sodium and potassium towards water increases down the group

3

// The reactivity of lithium, sodium and potassium towards water in increasing order is : Lithium, sodium and potassium

[Able to the hypothesis of the experiment] The reactivity of lithium, sodium and potassium are different.

2

// The reactivity of lithium, sodium and potassium towards oxygen/ halogen increases down the group

[Able to state that there is a reaction between lithium / sodium / potassium and water ]

1

[No response given or wrong response]

0

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Question 2(c)

Explanation

Maximum score

[Able to state the three variables correctly.] Sample answer: Manipulated variable : Type of metal 3 Responding variables : Reactivity of metal Fixed variables : Size of metal, volume of water [Able to state any two variables correctly.] [Able to state only one variables correctly.] [No response given or wrong response]

Question 2(d)

Explanation

Maximum score

[Able to state complete materials and apparatus.] Sample answer: Materials: Lithium, sodium, potassium, water Apparatus: Basin/beaker, filter paper, pen knife/blade, forcep/tongs [Able to state any six materials and apparatus correctly.] [Able to state any three materials and apparatus correctly.] [No response given or wrong response]

Question 2(e)

2 1 0

Explanation

3

2 1 0 Maximum score

[Able to write the complete procedure of the experiment correctly] Suggested answer: 1. A small piece of lithium is cut using a knife and a pair of forceps 2. The surface of lithium is dried with filter paper 3. The piece of lithium is placed on the surface of water in a trough

3

4. The movement of lithium and any sound/flame given out is observed and recorded 5 Repeat the experiment using a small piece of sodium and potassium. [Able to write the necessary steps of the expeimental procedure] Steps 1, 3, 4 and 5

2

[Able to write the minimum experimental procedure] 1

Steps 3 and 5 [No response given or wrong response]

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Question 2(f)

Explanation

Maximum score

[Able to construct a labeled tabulation of data ] Sample answer: Metal

Observation

3

Lithium Sodium Potassium [Able to construct a tabulation of data ] Sample answer: Metal

Observation

2

[Able to construct a table consisting of two rows and two columns.] 1

[No response given or wrong response]

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