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SULIT 1 4541/3
4541/3Nama : ... Kelas : ...Kimia
Kertas 3
Nov
2006
1 Jam
SEKTOR SEKOLAH BERASRAMA PENUH
KEMENTERIAN PELAJARAN MALAYSIA_______________________________________________
PEPERIKSAAN AKHIR TAHUN TINGKATAN 4
2006
KIMIA
KERTAS 3
Satu jam Tiga Puluh Minit
JANGAN BUKA KERTAS SOALAN INI SEHINGGA DIBERITAHU
1. Tuliskan nama dan tingkatan padaUntuk Kegunaan Pemeriksaruang yang disediakan.
Soalan Markah Markah2. Calon dikehendaki membaca maklumatPenuh Diperolehdi halaman 2.
1 18
2 15
3 17
JUMLAH 50
Kertas soalan ini mengandungi 13 halaman bercetak
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4541/3 SULIT
SULIT 2 4541/3
INFORMATION FOR CANDIDATES
1. This question paper consists of three questions. Answer all questions.
2. Write your answers for Question 1 andQuestion 2 in the spaces provided in the question
paper.
3. Write your answer for Question 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 answer Question 1 andQuestion 2 is 45 minutes andQuestion 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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SULIT 3 4541/3
Answerall questions
The time suggested to answer Question 1 andQuestion 2 is 45 minutes.
1 A student carried out an experiment to determine the empirical formula of zinc oxide.The steps and set-up of apparatus of the experiment are shown in Figure 1.
1. The crucible and lid are weighed.
lid
crucible
digital balance125.4372g
2. The crucible, lid and zinc powder are weighed.
zinc powder
133.2380g
3. The zinc powder is heated until it reacts completely with oxygen.
yellow fumes
heat
4. The crucible, lid and zinc oxide are weighed when cooled.
zinc oxide
powder
135.0680g
FIGURE 1
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SULIT 4 4541/3
(a) Complete the following table by stating the observations and related inferences in
the experiment.
Observations Inferences
(i) ................................................ (i) ................................................................
.................................................... ....................................................................
(ii) ............................................... (ii) ...............................................................
.................................................... .....................................................................
(iii) ) (iii)
.................................................... .................... ...............................................
1(a).................................................... ....................................................................
[6 marks]
(b) Round off the reading to two decimal places and record it in the table below.
Description Mass / g
The crucible and lid.
The crucible, lid and zinc powder.
The crucible, lid and zinc oxide. 1(b)
[3 marks]
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SULIT 5 4541/3
(c) (i) Calculate the mass of zinc that has been used.
(ii) Calculate the mass of oxygen which reacted with zinc.
(iii) Determine the empirical formula of zinc oxide.
Use the information that the relative atomic mass, O = 16, Zn = 65
1(c)
[3 marks]
(d) The student wants to determine the empirical formula of copper(II) oxide. He
used the steps and set-up of apparatus as the experiment before.
Predict whether the empirical formula of copper(II) oxide can be determined.Explain your answer.
...................................................................................................................................
1(d)..................................................................................................................................
[3 marks]
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SULIT 6 4541/3
(e) Below are some oxides of element.
magnesium oxide
sulphur dioxide
carbon dioxide
copper(II) oxide
Classify the oxides in into two groups, those which are basic oxides and those which
are acidic oxides.
Put your answer in a suitable table.
1(e)
[3 marks]
Total
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SULIT 7 4541/3
2All elements in Group 17 of The Periodic Table of the Elements show similar
chemical properties but the reactivity is different.
Figure 2 shows the set-up of apparatus for an experiment to compare the
reactivity of chlorine, Cl , bromine, Br and iodine, I towards their reaction with2 2 2iron.
Set-up of apparatus Observation on
the iron wool
Iron wool
Bromine Iron ignites brightly.gas, Br A brown solid is2
formed.
Heat
Iron wool
IodineIron glows dimly and
gas, Islowly.
2
A brown solid isformed.
Heat
Ir on wool
ChlorineIron ignites rapidly
gas, Cl2 with a bright flame.
A brown solid is
formed.
Heat
FIGURE 2
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SULIT 8 4541/3
(a) Complete the table below based on the experiment.
Name of variables Action to be taken
(i) Manipulated variable: (i) The way to manipulate variable:
............................................................. ............................................................
............................................................ ............................................................
............................................................ ............................................................
(ii) Responding variable: (ii) What to observe in the
............................................................ responding variable:
............................................................ .............................................................
............................................................. .............................................................
(iii) Fixed variable: (iii) The way to maintain the fixed
............................................................. variable:
............................................................. .............................................................
............................................................ ............................................................
2(a)
[6 marks]
(b) State one hypothesis for the experiment.
.....................................................................................................................................2(b)
.....................................................................................................................................
[3 marks]
(c) Based on the observation for the experiment, state the relationship between the
position of the halogens in The Periodic Table of the Elements and the reactivity of
the reaction towards iron.
.....................................................................................................................................
2(c)
.....................................................................................................................................
[3 marks]
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SULIT 9 4541/3
(d) Arrange chlorine, bromine and iodine in descending order of reactivity of halogen
towards iron.
2(d)
Descending order of reactivity of metal towards iron
[3 marks]
Total
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SULIT 10 4541/3
3
In a simple voltaic cell, when two different metals are dipped into an electrolyte,
the metal which is situated higher in the electrochemical series will donate
electrons and become the negative terminal.
You are given the strips of magnesium, copper, zinc and lead. You are required to
construct the electrochemical series for these metals.
Based on the statements above, design a laboratory experiment to construct the
electrochemical series by measuring the potential difference of two metals.
Your explanation should include all the followings:
(a) Aim of the experiment.
(b) Variables.
(c) Statement of hypothesis.
(d) List of materials and appar atus.
(e) Procedures of the experiment.
(f) Tabulation of data.
[17 marks]
END OF QUESTION PAPER
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SULIT 11 4541/3
SPACE FOR YOUR ANSWER
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SULIT 12 4541/3
SPACE FOR YOUR ANSWER
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SULIT 13 4541/3
SPACE FOR YOUR ANSWER
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BAHAGIAN SEKOLAH
KEMENTERIAN PELAJARAN MALAYSIA
CHEMISTRY FORM 4
FINAL EXAM 2006MARKING SCHEME
PAPER 3
1
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1 (b)
Score Rubric
3 [Able to record the data correctly]
Example:
Description Mass / g
The crucible and lid. 125.44
The crucible, lid and zinc powder. 133.24
The crucible, lid and zinc oxide. 135.07
2 [Able to record two data correctly // all reading are correct to three or four
decimal places]
1 [Able to record one data correctly]
0 No response or wrong response
1 (c)
Score Rubric
3 [Able to calculate the mass of zinc, mass of oxygen and show the steps to
determine the empirical formula of zinc oxide accurately]Example:
i) Mass of zinc = 133.24 125.44 = 7.80 g
ii) Mass of oxygen = 135.07 133.24 = 1.83 g
iii)The empirical formula of zinc oxide:
Element Zn O
No. of moles 7.80 1.83
65 16
= 0.12 = 0.11
Simplest ratio 1 1
Empirical formula : ZnO
2 [Able to state the mass of zinc, mass of oxygen and show a part of steps to
determine the empirical formula of zinc oxide / state the empirical formulacorrectly]
Example:
i) Mass of zinc = 7.80 gii) Mass of oxygen = 1.83 g
iii)The empirical formula of zinc oxide : ZnO
1 [Able to state the mass of zinc / the mass of oxygen / the empirical formula of
zinc oxide correctly]
0 No response or wrong response
3
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1 (d)
Score Rubric
3 [Able to predict and explain the answer correctly]
Example:
No.
Copper is non-reactive metal.
2 [Able to predict but cannot explain the answer]
Example:
No.
Copper(II) oxide is non-reactive / copper is reactive metal.
1 [Able to give ideas on the prediction]
Example:
Yes.Copper is a reactive metal / copper can reacts with oxygen / copper is non-
reactive metal.
0 No response or wrong response
1 (e)
Score Rubric
3 [Able to classify the metal oxides correctly]
- write the name or symbol of the metal oxides
Example:Basic oxides Acidic oxide
Magnesium oxide / MgO Sulphur dioxide/ SO2Copper (II) oxide/CuO Carbon dioxide /CO 2
2 [Able to classify the metal oxides with less accuracy]
Example:
Basic oxides Acidic oxide
Magnesium oxide / MgO / Sulphur dioxide/ SO /2Copper (II) oxide/CuO Carbon dioxide /CO2
1 [Able to give ideas on the classification with less accuracy]
Example:
Magnesium oxide / MgO Sulphur dioxide/ SO 2Copper (II) oxide/CuO Carbon dioxide /CO
2
0 No response or wrong response
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2 (a)
Score Rubric
6 [Able to state all variables dan how to control the variables correctly]
Example:
Manipulated variable: Use different types of halogens i.e
Types of halogens chlorine, bromine and iodine
Responding variable: Observe the burning / glowing of iron
The reactivity of halogens wool when it is heated
Fixed variable: Use the same size /mass / type of iron
Iron
5 [Able to state any five items correctly]
4 [Able to state any four items correctly]
3 [Able to state any three items correctly]
2 [Able to state any two items correctly]
1 [Able to state any one item correctly]
0 No response or wrong response
2 (b)
Score Rubric
3 [Able to relate the manipulated variable to the responding variable correctly]
Example:The higher the position of a halogen, the more reactive it is when heated with
iron wool // The reactivity of halogens towards iron decreases when going down
the group.
2 [Able to relate the manipulated variables to the responding variables with less
accuracy]
Example:
The reactivity of halogens decreases when going down the group.
1 [Able to give ideas on the statement of hypothesis]Example:
The reactivity depends on the type of halogen // The reactivity of halogens
towards iron is different.
0 No response or wrong response
5
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2 (c)
Score Rubric
3 [Able to state the relationship between the position and reactivity of halogens
correctly]
Example:
The higher the position of a halogen in the Periodic Table, the mor e reactive it isin the reaction with iron // The reactivity of halogens towards iron decreases
when going down the group.
2 [Able to state the relationship between the position and reactivity of halogens
with less accuracy]
Example:Chlorine is the most reactive, bromine is reactive and iodine is the least reactive.
1 [Able to give ideas on the relationship between the position of halogens with lessaccuracy]
Example:
The reactivity of halogens towards iron are different.
Chlorine is the most reactive halogen.
0 No response or wrong response
2 (d)
Score Rubric3 [Able to arrange halogen correctly]
Example:
Chlorine, bromine, iodine
2 [Able to arrange halogen with less accuracy]
Example:Chlorine, iodine, bromine
1 [Able to give ideas on the reactivity]Example:
Iodine, bromine, chlorine
0 No response or wrong response
6
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3 (a) Aim of the experiment
Score Rubric
3 [Able to state the aim of the experiment accurately]
Example:
To construct the electrochemical series based on the potential difference betweenpairs of metal.
2 [Able to state the aim of the experiment with less accuracy]
Example:
To construct the electrochemical series based on the potential difference //
Can the electrochemical series be constructed based on the potential differencebetween pairs of metal?
1 [Able to give ideas on the aim of the experiment]
Example:
To construct the electrochemical series.
0 No response or wrong response
(b) Variables
Score Rubric
3 [Able to state all variables correctly]Example:
Manipulated variables: Pairs of metal / type of metal
Responding variables: Potential difference / voltage readings
Fixed variables: Copper electrode / copper(II) sulphate solution
2 [Able to state any two variables correctly]
1 [Able to state any variables correctly]
0 No response or wrong response
7
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(c) Statement of hypothesis
Score Rubric
3 [Able to relate the manipulated variable to the responding variable correctly]
Example:
The further apart the metal in the electrochemical series, the greater is their
potential difference.
2 [Able to relate the manipulated variable to the responding variable with less
accuracy]
Example:
By using different pairs of metal, the electrochemical series can be constructed //
The potential difference between pairs of metal is shown by the distance of the
metals in the electrochemical series.
1 [Able to give ideas on the statement of hypothesis]
Example:
The potential difference can be used to determine the position of metals in theelectrochemical series//
Different pairs of metal show a different voltage readings.
0 No response or wrong response
(d) List of materials and apparatus
Score Rubric
3 [Able to list down the materials and apparatus completely]
Example:Apparatus:
Voltmeter / galvanometer, beaker, connecting wires
Materials:Copper(II) sulphate solution(or any suitable electrolyte), copper strips, lead strip,
magnesium strip, zinc strip, sandpaper
2 [Able to list down part of the materials and apparatus]
Example:
Voltmeter / galvanometer, copper(II) sulphate solution (or any suitableelectrolyte), copper strips / lead strip / magnesium strip / zinc strip
1 [Able to give ideas on the materials and apparatus]
Example:
Voltmeter / galvanometer, electrolyte, electrode
0 No response or wrong response
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(e) Procedures of the experiment.
Score Rubric
3 [Able to state the procedures of the experiment accurately]
Example:
1. Clean the metals with sandpaper.
2. Pour [50 100 cm 3 ] of copper(II) sulphate solution into a beaker.3. Dip the magnesium and copper strips into copper(II) sulphate
solution.
4. Complete the circuit.
5. Record the potential difference / reading of the voltmeter.
6. Determine the metal strips which becomes the negative / positive terminal.
7. Repeat Steps 1 6 by replacing magnesium strip with other metals.
2 [Able to state the procedures of the experiment with less accuracy]
Example:
Write steps 3, 5, 7
1 [Able to give ideas on the procedures of the experiment]
Example:
Write steps 3, 5
0 No response or wrong response
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(f) Tabulation of data.
Score Rubric
3 [Able to tabulate the data correctly which consists of the followings]
Pair of electrodes Potential difference (V) Negative / Positive
terminal
Mg Cu
Zn Cu
Pb Cu
- Name pair of electrodes
- Unit for potential difference
2 [Able to tabulate the data which consists of the followings]
Pair of electrodes Potential difference Negative / Positive
terminal
1 [Able to give ideas on the tabulation of data]
0 No response or wrong response
6 construct : 6 x 3 = 18 marks
Max : 17 marks
END OF MARKING SCHEME PAPER 3
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