trial kimia
TRANSCRIPT
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SULIT 4541/3/PP
@ 2012 Hak Cipta MPSM Pahang 1 [ Lihat halaman sebelahSULIT
4541/3/PPPeraturan PermarkahanKimiaKertas 3OKT/NOV 2012
MPSM PAHANG
MARKING SCHEME
PEPERIKSAAN PERCUBAAN SPM 2012
TINGKATAN 5
CHEMISTRY
Paper 3
Kertas skema permarkahan ini mengandungi 14 muka surat bercetak.
Amaran
Peraturan pemarkahan ini adalah SULIT.
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SULIT 4541/3/PP
@ 2012 Hak Cipta MPSM Pahang 2 [ Lihat halaman sebelahSULIT
Question Mark scheme score
1(a) Able to state three observations.
Sample answer
Test tube I Intensity of blue colour produce is very high //
- Does not produce pink colour.
Test tube II Intensity of pink colour produce is very high //
- Does not produce blue colour.
Test tube III intensity of blue colour produce is very high //
- Does not produce pink colour.
3
Able to state any two correct observations. 2
Able to state any one correct observation 1
No response or wrong response 0
1(b) Able to state one inference for each experiment
Sample answer:
Test tube I : iron rust/oxidised // iron atom released electron//
iron(II) ions/ Fe2+ formed// iron(II) ions
present// rusting occur
Test tube II : iron does not rust// iron(II) ions are not present
// zinc corrode // zinc atom release
electron// zinc ions formed // zinc oxidised
Test tube III : iron rust/oxidised // iron atom released electron
// iron(II) ions/ Fe2+ formed // iron(II) ions
present // rusting occur
3
Able to state any two inferences 2
Able to state any one inference 1
No response or wrong response 0
1(C Able to state the hypothesis accurately
Sample answer:
When a more/ less electropositive metal is in contact with
iron/ferum/Fe, the metal inhibits/ (speeds up) rusting/ corrosion
of iron //
3
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When a more/ less electropositive metal is in contact with
iron/ferum/Fe, rusting of iron/ferum/Fe is slower/faster
If the metal in contact with iron is higher/lower than
iron/ferum/Fe in electrochemical series, the rusting/corrosion of
iron is slower/faster//
The higher/lower the metal in contact with iron in
electrochemical series/than iron/ferum/Fe, the rusting/corrosion
of iron/ferum/Fe is slower/faster
Able to state the hypothesis correctly
Sample answer:
When a more/less electropositive metal, the metal inhibits/
(speeds up) rusting/corrosion of iron//
If the metal in contact with iron is higher than iron/ferum/Fe in
reactivity series, the rusting/corrosion of iron is slower/faster//
The rusting of iron/ferum/Fe is faster/slower, if a less / more
electropositive metal is in contact with iron/ferum/Fe
2
Able to state the idea of hypothesis
Sample answer
Different metal in contact with iron, will cause iron to rust//
Metal can cause iron to rust.
1
No response or wrong response 0
1 (d) Able to state the three variables correctly
Sample answer:
(i) Manipulated variable:
Type/different metals// position of metal in
electrochemical series
(ii) Responding variable:
3
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Rusting/ corrosion// presence of blue/pink colour
(iii) Constant variable:
Size/mass of iron nail// type of nail// clean iron nails//
temperature// medium in which the iron nails are kept
Able to state any two variables correctly 2
Able to state any one variable correctly 1
No response or wrong response 0
1(e) Able to give the operational definition accurately.
Sample answer:
When iron is in contact with metal lower than iron in
electrochemical series, blue colouration indicates rusting//
Rusting occurs when iron nail is in contact with copper/tin/less
electropositive metal and form blue colouration//
Blue colouration is formed when iron is in contact with metal
lower than iron in electrochemical series.
3
Able to give the operational definition correctly.
Sample answer:
Blue colouration indicates rusting//
Rusting occurs when iron nail is contact with copper/tin/less
electropositive metal
2
Able to give an idea of the operational definition.
Sample answer:
Rusting occurs when the colour of solution changes.//
Rusting occurs.
1
No response or wrong response 0
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SULIT 4541/3/PP
@ 2012 Hak Cipta MPSM Pahang 5 [ Lihat halaman sebelahSULIT
1(f) Able to predict any one the observations based on the
laboratory experiment correctly
Sample answer:
Intensity of blue colour higher //
Iron nail becomes smaller//
Lead strip remains unchanged
3
Able to predict one observation less correctly
Sample answer:
Pink spot/colouration
2
Able to give an idea of observation
Sample answer:
Iron rusts // brown deposit/spot
1
No response or wrong response 0
Question Details Score
2.a) Able to record all readings accurately to one decimal point with
unit.
Sample answer:
Set Initial thermometer
reading,C
Highest thermometer
reading,C
I 27.0 53.0
II 29.0 57.0
III 27.0 59.0
3
Able to record all readings correctly.
# readings to one decimal point without unit.
# readings without decimal point with / without unit.
Sample answer:
Set Initial thermometer
reading
Highest thermometer
reading
I 27.0 53.0
II 29.0 57.0
III 27.0 59.0
2
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@ 2012 Hak Cipta MPSM Pahang 6 [ Lihat halaman sebelahSULIT
OR
Set Initial thermometer
reading
Highest thermometer
reading, C
I 27 53
II 29 57
III 27 59
Able to record three or five readings correctly 1
No response or wrong response 0
Question Details Score
2.b) Able to construct a table to record the initial temperature of
water, highest temperature of water and increase in temperature
for Set I, Set II and Set III
1.correct titles
2. readings and units
Sample answer:
Set I II III
Initial temperature, C 27.0 29.0 27.0
Highest temperature, oC 53.0 57.0 59.0
Increase in temperature, oC 21.0 29.0 32.00
3
Able to construct a less accurate table that contains the
following:
1. Titles
2. Readings
Sample answer:
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I II III
Initial temperature 27C 29 27C
Highest temperature 53.0 57.0 59.0
Increase in temperature 26C 28 32C
2
Able to construct a table with at least one title/ reading.
Sample answer :
I II III
Increase in temperature
1
No response or wrong response 0
2.c) Able to sketch the graph of heat of combustion of alcohols
against number of carbon atoms per molecule.
The graph must have the following information:
1. The axes are labeled correctly
2. Correct unit
3. Correct curve
Sample answer:3
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SULIT 4541/3/PP
@ 2012 Hak Cipta MPSM Pahang 8 [ Lihat halaman sebelahSULIT
Able to sketch the graph of heat of combustion against number
of carbon atoms
i. without units on y-axis
ii. correct curve
sample answer:2
Able to sketch the graph with only one correct information.
Sample answer:
1
Heat of combustion, KJmol-1
1 2 3 4
Number of C atom per molecule
Heat of combustion
1 2 3 4Number of carbon atom
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Or
No response or wrong response 0
2.d) Able to state three correct information from the diagram.
Sample answer:
1. The reaction is an exothermic reaction // heat energy is
released to the surrounding.
2. 726 KJ of heat is released when one mole of methanol is
burnt.
3. Total energy of reactant is higher than the products.
3
Able to state any two correct information. 2
Able to state any one correct information. 1
No response or wrong response. 0
2.e) Able to classify all carbon compounds correctly.
Sample answer:
Hydrocarbon Non-hydrocarbon
Ethene, C2H4 Propanol, C3H7OH
Methanoic acid, HCOOH
Prophyl ethanoate,
CH3COOC3H7
3
Heat of combustion KJmol-1
Number of C atom
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Able to classify at least three carbon compounds correctly. 2
Able to classify any one carbon compound correctly. 1
No response or wrong response. 0
Question
Number
Rubric Score
3(a) Able to give the statement of problem correctly.
Sample answer:
Does all nitrate, sulphate, carbonate and chloride salts aresoluble in water?
3
Able to give the statement of problem correctly.
Sample answer:
Does all salts are soluble in water?
2
Able to give the statement of problem correctly.
Sample answer:
Salt are soluble and insoluble in water
1
No response or wrong response 0
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@ 2012 Hak Cipta MPSM Pahang 11 [ Lihat halaman sebelahSULIT
3(b) Able to state all variables correctly
Sample answer:
Manipulated variable: Type of salt
Responding variable: Solubility of salt
Constant variable: volume of water/ mass of
salt/temperature
3
Able to state any two variables above correctly 2
Able to state any one variables above correctly 1
No response or wrong response 0
3 Able to give hypothesis accurately.
Sample answer:
Some of salts soluble in water but other salts insoluble in water// all nitrate salts are soluble in the water but the other saltsinsoluble in water.
3
Able to give the statement of hypothesis correctly.
Sample answer:
All nitrate salt are soluble in water
2
Able to give idea of hypothesis.
Sample answer:
Different salts produce different solubility in water
1
No response or wrong response 0
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SULIT 4541/3/PP
@ 2012 Hak Cipta MPSM Pahang 12 [ Lihat halaman sebelahSULIT
3(d) Able to list completely the materials and apparatus
Sample answer:
Material:
1. Any suitable nitrate, sulphate, carbonate and chloride
salts soluble and insoluble in water
2. Distilled water
Apparatus:
1. Test tube
2. Spatula
3
Able to list incompletely materials and apparatus.
Sample answer:
Materials:
1. Incomplete salt :
List only 3 type of salt Eg zinc nitrate, lead (II) sulphate,
calcium carbonate
2. Distilled water
Apparatus:
1. Test tube
2. Spatula
2
Able to give an idea of materials and apparatus.
Sample answer:
Materials:
1. Incomplete salt :
List only 2 type of salt Eg zinc nitrate, plumbum (II)
sulphate, calcium carbonate
1
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2. No distilled water
Apparatus:
1. Test tube
2. Spatula
No response or wrong response 0
3 (e) Able to state all procedures completely and correctly
Sample answer:
1. Half a spatula of (nitrate salt) powder is added in a test
tube
2. Pour 5 cm3 of distilled water into the test tube
3. Shake the test tube.
4. Observe the solubility of salt and record in the table.
5. Experiment is repeated using various salt powder.
3
Able to state procedures incompletely.
Sample answer:
1. Half a spatula of (nitrate salt) powder is added in a test
tube
2. Pour 5 cm3 of distilled water into the test tube
3. Observe the solubility of salt and record in the table.
2
Able to give an idea of the procedure.
Sample answer:
1. Half a spatula of (nitrate salt) powder is added in a test
tube
1
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2. Pour 5 cm3 of distilled water into the test tube
No response or wrong response 0
3(f) Able to exhibit the tabulation of data correctly.
Sample answer:
Salt Solubility of salt in water
Zinc nitrate
Magnesium chloride
Sodium chloride
Lead (II) sulphate
Copper (II) sulpahte
Potassium carbonate
2
Able to exhibit the tabulation of data less accurately.
Sample answer:
Salt Solubility of salt in water
1
No response or wrong response 0
END OF MARKING SCHEME