spm mid year 2008 sbp chemistry paper 3

8/14/2019 SPM Mid Year 2008 SBP Chemistry Paper 3

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Untuk Kegunaan Pemeriksa

Soalan Markah

Penuh

Markah

Diperoleh

1 18

2 15

3 17

JUMLAH 50

Nama : ... Kelas : ...

SEKTOR SEKOLAH BERASRAMA PENUH

KEMENTERIAN PELAJARAN MALAYSIA

_______________________________________________

PEPERIKSAAN PERTENGAHAN TAHUN

2008

KIMIA

KERTAS 3

Satu jam Tiga Puluh Minit

JANGAN BUKA KERTAS SOALAN INI SEHINGGA DIBERITAHU

1. Tuliskan nama dan tingkatan pada

ruang yang disediakan.2. Calon dikehendaki membaca maklumat di

halaman 2.

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Kertas 3

Mei

20081 Jam


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Kertas soalan ini mengandungi9 halamanbercetak

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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. Show your working. It may help you to get marks.

4. If you wish to cancel any answer, neatly cross out the answer.

5. The diagrams in the questions are not drawn to scale unless stated.

6. Marks allocated for each question or part question are shown in brackets.

7. The time suggested to answerQuestion 1 andQuestion 2 is 45 minutes andQuestion 3 is

45 minutes.

8. You may use a non-programmable scientific calculator.

9. 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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1. An experiment was conducted to find out the effect of temperature on the rate of reaction.

50 cm3 of sodium thiosulphate solution 0.2 mol dm-3 at 30 oC was put into a 150 cm3

conical flask. Then the conical flask was placed on an X sign on a piece of white paper.

5 cm3 of sulphuric acid 1.0 mol dm-3 was added to the sodium thiosulphate solution and

shaken. At the same time, the stop watch was started. The stop watch was stopped as

soon as the X sign was no longer visible. The same steps of the experiment were

repeated for sodium thiosulphate solution which was heated to 35 oC, 40oC, 45oC and

50oC.

Diagram 1 shows the reading of the stop watch for each of the reaction at different

temperatures.

(a) Record the time for each reaction in the spaces provided in Diagram 1.

[3 marks]

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Time ,t1

at 30 o CTime ,t2

at 35 o C

Time ,t3

at 40 o C

Time ,t4 at 45 o C

Time ,t5 at 50 o C

Diagram 1


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(b) State one observation in this experiment.

[3

marks]

(c) Construct a table and record temperature, time, and 1/ time for this experiment.

[3 marks]

(d) (i) Plot a graph of temperature of sodium thiosulphate solutions against 1/ time.[3 marks]

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Graph of temperature against 1/ time

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(ii) Based on the graph in (d) (i), state the relationship between the rate of reaction

and temperature.

.

[3 marks]

(e) Complete the Table 1.1 based on the above experiment.

Type of variable Action that needs to be taken

(i) Manipulated variable:

.

.

.

The way to manipulate the variable:

...

...

...

(ii) Responding variable:

.

.

.

What to observe in the responding variable:

...

...

...

(iii) Fixed variable:

.

.

.

The way to maintain the fixed variable:

...

...

...

[3 marks]

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Table 1.1


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2. The pupil carried out an experiment to construct the electrochemical series of metals

using 0.5 mol dm-3 copper(II) sulphate solution as the electrolyte.

The set up of apparatus of this experiment is shown in Diagram 2.

Diagram 2

Table 2 shows the voltmeter readings of each cell that obtained from the pairs of metals.

Experiment Pair of metals

Y electrode Positive electrode

Reading of voltmeter

( V )

I Magnesium Copper 2.70

II Iron Copper 0.78

III Zinc Copper 1.10

IV Lead Copper 0.45

Table 2

(a) Based on experiment I,

(i) Write the overall ionic equation.

[ 3 marks ]

(ii) Based on the change in size that you observed at the magnesium electrode after

30 minutes, state the inference.

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Copper(II) sulphate solution

Y Cu

V


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[ 3 marks ]

(b) Predict the voltmeter readings of the cell when zinc and lead metals are used.

[ 3 marks ]

(c) Based on Table 2, arrange the metals zinc, iron, magnesium, lead and copper

in an ascending order based of their tendency to release electron.

[ 3 marks ]

(d) Give the operational definition of the above reaction.

[ 3 marks ]

3. Diagram 3 shows two beakers containing colourless solution labelled A and B.

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Diagram 3

You are told that the two colourless solutions are calcium nitrate and magnesium nitrate. You are

required to label correctly the name of each solution in the containers.

Design an experiment to identify which is calcium nitrate and which is magnesium nitrate

solution by using aqueous of ammonia solution as a reagent.

Your answer should include the following:

(a) Problem statement

(b) Hypothesis

(c) All variables

(d) List of materials and apparatus

(e) Procedure

(f) Tabulation of data

[17 marks]

END OF QUESTION PAPER

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Beaker A Beaker B

spm mid year 2008 sbp chemistry paper 3

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