kimia p3 f4 akhir 06
TRANSCRIPT
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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. Write your answer forQuestion 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 answerQuestion 1 andQuestion 2 is 45 minutes andQuestion 3is 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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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.
2. The crucible, lid and zinc powder are weighed.
3. The zinc powder is heated until it reacts completely with oxygen.
4. The crucible, lid and zinc oxide are weighed when cooled.
FIGURE 1
zinc powder
crucible
lid
digital balance
yellow fumes
zinc oxide
powder
heat
125.4372g
133.2380g
135.0680g
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(a) Complete the following table by stating the observations and related inferences in
the experiment.
Observations Inferences
(i) ................................................
....................................................
(i) ................................................................
....................................................................
(ii) ...............................................
....................................................
(ii) ...............................................................
.....................................................................
(iii) )
....................................................
....................................................
(iii)
.................... ...............................................
....................................................................
[6 marks]
(b) Round off the reading to two decimal places and record it in the table below.
[3 marks]
Description Mass / g
The crucible and lid.
The crucible, lid and zinc powder.
The crucible, lid and zinc oxide.
1(a)
1(b)
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(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
[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.
...................................................................................................................................
..................................................................................................................................
[3 marks]
1(c)
1(d)
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(e) Below are some oxides of element.
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.
[3 marks]
magnesium oxide
sulphur dioxide
carbon dioxide copper(II) oxide
1(e)
Total
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2
Figure 2 shows the set-up of apparatus for an experiment to compare the
reactivity of chlorine, Cl2, bromine, Br2 and iodine, I2 towards their reaction withiron.
Set-up of apparatus Observation on
the iron wool
Iron ignites brightly.
A brown solid is
formed.
Iron glows dimly and
slowly.
A brown solid is
formed.
Iron ignites rapidly
with a bright flame.
A brown solid is
formed.
FIGURE 2
All elements in Group 17 of The Periodic Table of the Elements show similar
chemical properties but the reactivity is different.
Bromine
gas, Br2
Iron wool
Heat
Iodine
gas, I2
Iron wool
Heat
Chlorine
gas, Cl2
Iron wool
Heat
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(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:
.............................................................
............................................................
[6 marks]
(b) State one hypothesis for the experiment.
.....................................................................................................................................
.....................................................................................................................................
[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 ofthe reaction towards iron.
.....................................................................................................................................
.....................................................................................................................................
[3 marks]
2 a
2(c)
2(b)
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(d) Arrange chlorine, bromine and iodine in descending order of reactivity of halogen
towards iron.
Descending order of reactivity of metal towards iron
[3 marks]
2(d)
Total
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3
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 apparatus.
(e) Procedures of the experiment.
(f) Tabulation of data.
[17 marks]
END OF QUESTION PAPER
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.
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SPACE FOR YOUR ANSWER
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SPACE FOR YOUR ANSWER
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SPACE FOR YOUR ANSWER
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1
BAHAGIAN SEKOLAH
KEMENTERIAN PELAJARANMALAYSIA
CHEMISTRY FORM 4
FINAL EXAM 2006
MARKING SCHEME
PAPER 3
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MARKINGSCHEME PAPER 3
1 (a)
Score Rubric
3 [Able to state three inferences according to the observations correctly]Example:
Observations Inferences
i) Yellow fumes is released. Zinc oxide is produced // Zinc has
been oxidised.
ii) Bright burning. Zinc is a reactive metal.
iii) The mass increases. Zinc has combined with oxygen.
iv) The residue is yellow when hot
and white when cold.
Zinc oxide is produces // Zinc has
been oxidised.
2 [Able to state two inferences /two observations which is accurate or two
inaccurate inferences / two inaccurate observations ]
Example:
Observations Inferences
i) Fumes is released. Zinc compound is produced // Zinc
has been oxidised.
ii) Zinc burns. Zinc is a reactive metal.
iii) The mass increases. Zinc has combined with oxygen.
iv) The metal change colour. Zinc oxide is produces // Zinc hasbeen oxidised.
1 [Able to give ideas on the observations and inferences]
Example:
Observations Inferences
i) Gas is released. Zinc compound is produced // Zinc
has been oxidised.
ii) Burning. The reaction occur.
iii) The mass of zinc oxide increases. Zinc reacts when it is heated.
iv) The metal precipitate. Zinc oxide is produces.
0 No response or wrong response.
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1 (b)
Score Rubric
3 [Able to record the data correctly]
Example:
Description Mass / g
The crucible and lid.
The crucible, lid and zinc powder.
The crucible, lid and zinc oxide.
125.44
133.24
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 giii)The empirical formula of zinc oxide:
Element Zn O
No. of moles 7.80
65
= 0.12
1.83
16
= 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 g
ii) 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
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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 oxidesExample:
Basic oxides Acidic oxide
Magnesium oxide / MgO
Copper (II) oxide/CuO
Sulphur dioxide/ SO2Carbon dioxide /CO2
2 [Able to classify the metal oxides with less accuracy]
Example:
Basic oxides Acidic oxide
Magnesium oxide / MgO /
Copper (II) oxide/CuO
Sulphur dioxide/ SO2 /
Carbon dioxide /CO2
1 [Able to give ideas on the classification with less accuracy]
Example:
Magnesium oxide / MgO Sulphur dioxide/ SO2Copper (II) oxide/CuO Carbon dioxide /CO2
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:
Types of halogens
Use different types of halogens i.e
chlorine, bromine and iodine
Responding variable:
The reactivity of halogens
Observe the burning / glowing of iron
wool when it is heated
Fixed variable:
Iron
Use the same size /mass / type of 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 Rubric3 [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
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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 more reactive it is
in 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 less
accuracy]
Example:
The reactivity of halogens towards iron are different.
Chlorine is the most reactive halogen.
0 No response or wrong response
2 (d)
Score Rubric
3 [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
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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 the
electrochemical 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 suitable
electrolyte), 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 / Positiveterminal
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 OFMARKING SCHEME PAPER 3