spm trial 2012 chemistry qa pahang
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`
SULIT 4541/1/PP 4541/1/PP PERATURAN PERMARKAHAN CHEMISTRY Kertas 1 OKT/NOV 2012
MAJLIS PENGETUA SEKOLAH MALAYSIA NEGERI PAHANG
PERATURAN PERMARKAHAN PEPERIKSAAN PERCUBAAN TAHUN 2012
CHEMISTRY Tingkatan 5
SKEMA KERTAS 1
MAKLUMAT UNTUK PEMERIKSA KERTAS
1. Kertas skema ini mengandungi 50 jawapan untuk soalan objektif. 2. Kertas skema ini adalah sulit sehinggalah tamat peperiksaan percubaan SPM 2012. 3. Terima kasih.
Kertas skema ini mengandungi 2 halaman bercetak
© 2012 Hak Cipta MPSM Pahang [Lihat halaman sebelah SULIT
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`
SULIT 4541/1
Marking sheme Chemistry Paper 1 Form 5
( TRIAL EXAM 2012 @ MPSM Pahang)
© 2012 Hak Cipta MPSM Pahang [ Lihat halaman sebelah
SULIT
No. Soalan
Answer No.
Soalan Answer
No. Soalan
Answer No.
Soalan Answer
1 A 14 C 27 C 40 B
2 C 15 C 28 B 41 B
3 D 16 C 29 B 42 A
4 D 17 D 30 D 43 A
5 C 18 C 31 C 44 C
6 C 19 C 32 B 45 C
7 C 20 C 33 C 46 D
8 A 21 B 34 A 47 C
9 D 22 B 35 B 48 D
10 D 23 B 36 A 49 C
11 B 24 D 37 B 50 C
12 D 25 A 38 A
13 A 26 C 39 A
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SULIT 1 4541/2/PP
@ 2012 Hak Cipta MPSM Pahang [Lihat halaman sebelah SULIT
4541/2/PP Peraturan Permarkahan Chemistry Kertas 2 Okt/Nov 2012
MPSM PAHANG
PEPERIKSAAN PERCUBAAN SPM TAHUN 2012
TINGKATAN 5
CHEMISTRY
Kertas 2
PERATURAN PEMARKAHAN
_____________________________________________________________________
Kertas skema ini mengandungi 10 halaman bercetak
Amaran
Peraturan pemarkahan ini adalah SULIT.
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SULIT 2 4541/2/PP
@ 2012 Hak Cipta MPSM Pahang [Lihat halaman sebelah SULIT
MARKING SCHEME / SKEMA PERMARKAHAN
CHEMISTRY PAPER 2
TRIAL SPM MPSM PAHANG 2012
NO Answers Marks
1.a)
b)(i)
(ii)
c)
d)(i)
(ii)
e)(i)
CR3RH R6
CRnRH R2n+1 ROH
CR3RH R7 ROH CR3RHR6 R + HR2R0
H H H H H H
H- C –C- C - H
H – C – C – C -O H
H H H H OH H
Propan-1-ol Propan-2-ol
(any one)
Propane
CR3RH R6R + HR2 R CR3RHR8R
-Formula reactant correct
-Formula product correct
Propyl ethanoate
1
1
1
1+1
1
1
1
1
9
2.a)
(i)
(ii)
Number of proton in nucleus of its atom
15
1
1
b) Nucleon number 1
c)(i) Q and R have different number of neutron/nucleon number 1
(ii)
Carbon 14 - to estimate the age of fossils and artifacts
Cobalt 60 - kill cancer cells,sterilised medical instruments
Sodium 24-detect leakage of underground pipes
(any one)
1
d (i)
(ii)
iii)
2.8.7
7
Draw diagram:
-
1
1
R
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SULIT 3 4541/2/PP
@ 2012 Hak Cipta MPSM Pahang [Lihat halaman sebelah SULIT
- Figure of electron arrangement of R
3 shells
1
1
9
3.a)
( i)
(ii)
(iii)
b)
c)
d)
e)
f)
g)
Z
Q
Y
Q, P, Z, Y, T
4
Z has higher number of protons than T. Hence it has stronger
nuclei attraction on the electrons.
YP
3+
Transition Elements
Their ions or compounds are colored//They form complex
ions or compounds/they are good catalysts//They can have
variable oxidation.
1
1
1
1
1
1 + 1
1
1
1
10
4.a)
b.(i)
(ii)
(c)
d)(i)
(ii)
e)
HP
+P , Cu P
2+P ,
SOR4RP
2-P , OHP
-
Bubbles of gas released
Concentration of Cu P
2+P decrease // Cu P
2+P
discharge to form Cu atom
Cu P
2+P + 2e Cu
Anode become thinner / smaller / mass
decrease
Cathode become thicker / bigger / mass
increase
Correct diagram
Copper electrode at anode
Steel spoon at cathode
Copper (II) sulphate as electrolyte
Correct label
1
1
1
1
1
1
1
1
1
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SULIT 4 4541/2/PP
@ 2012 Hak Cipta MPSM Pahang [Lihat halaman sebelah SULIT
f)
Hydroxide ion 1
10
5.a)
b)
c)
d)
e)
f)
g)
Pink to colourless
The point in the titration at which the indicator changes
colour
HR2RSOR4 R + 2NaOH NaR2RSOR4R + 2HR2RO
Sodium sulphate and water
MR1RVR1 R = U 1
MR2RVR2 R 2
U0.25 × VUR1R = 1 0.5 × 25 2
VR1 R= U1 × 0.5 × 25 2 × 0.25
= 25cmP
3
50 cmP
3
i) Vinegar is used to cure wasp sting that alkaline in nature
ii) Toothpaste contain bases to neutralize acid produce by
bacteria
1
1
1+1
1
1
1
1
1
1 + 1
11
6.
a)
b)
c)
d)
Redox reaction is a reaction in which oxidation and reduction
occur at the same time
Oxygen and water
Fe → FeP
2+P + 2e
Label of water droplet, oxygen and iron
Label of anode and cathode
Draw arrow from negative to positive pole iron
1
1
1
1
1
1
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SULIT 5 4541/2/PP
@ 2012 Hak Cipta MPSM Pahang [Lihat halaman sebelah SULIT
e)
f)
Electron transfer form anode to cathode
Oxygen in water gains electrons
Hydroxide ion is form
Using sacrificial metal // sacrificial protection /
By alloying /
By tin platting /
By galvanizing
(Any two)
1
1
1
1+1
11
7
a)
Correct axis with unit
Correct and Smooth line
Correct scale
1
1
1
0
1
2
3
4
5
6
1 2 3 4 5 6 7
hei
ght
of
pre
cip
itat
e/ c
m
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SULIT 6 4541/2/PP
@ 2012 Hak Cipta MPSM Pahang [Lihat halaman sebelah SULIT
b.
(i)
(ii)
c)
d.(i)
(ii)
iii)
Pb(NOR3R)R2 R + 2KI PbIR2R + 2KNOR3
Volume of Pb(NO R3R)R2 R= 2.5 cmP
3
No of mole Plumbum (II) ion = 1 x 0.0025 = 0.0025 mol
No of mole iodide ions = 2 x 0.0025 = 0.005 mol
PbP
2+P +2 IP
-P PbIR2R
Correct reactants and products
Balance equation
Salt X = Copper (II) carbonate
Gas Z = Carbon dioxide
Y precipitate = Barium sulphate
CuSOR4R + Ba(NOR3R)R2 R Cu(NOR3R)R2 R + BaSOR4R
Correct reactants and products
Balance equation
1. Add sodium hydroxide solution.
2. Blue precipitate formed indicates the presence of Cu P
+P ion.
3. Add hydrochloric acid.
4. Add barium chloride solution.
5. White precipitate formed indicate the presence of SO R4RP
2-P
ion.
1 + 1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
20
8.
a)
1. the mixture becomes hot 2. the thermometer reading increase
3. zinc powder dissolves
4. brown solid/precipitate formed
5. the blue solution turn colourless (Any three)
1+1+1
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@ 2012 Hak Cipta MPSM Pahang [Lihat halaman sebelah SULIT
(b)(i)
(ii)
(iii)
(iv)
c) (i)
Cu P
2+ P+ Zn Cu + ZnP
2+
-Correct formula & reactants
-correct balance
Heat released in the reaction
-50x4.2x5// 1050 J
-number of mol of Cu atom
U50x0.1U//0.005 mol
1000
-show the step to obtain heat of displacement
U1050 J
0.005 mol
- heat of displacement with unit and negative symbol
-210000 Jmol P
-1P//-210 kJmolP
-1
-heat loss to the surrounding
U2 precautions
1. use polysterene cup//use two layers of polysterene cup
Instead of one.
2. add zink powder quickly into the solution
3. stir the mixture continuously until highest temperature
obtained.
(Any two)
- temperature change will be doubled//10 P
0PC
- number of copper(II) ions per unit is doubled/ two times
higher
Label Energy, correct level of reactants & product
- correct chemical equations
- H with negative symbol and unit
Zn + CuP
2+
H= - 210 kJ molP
-1P
Energy
ZnP
2+P + Cu
1
1
1
1
1
1
1
1+1 1
1
1
1
1
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(ii)
Exothermic reaction//heat released to the surrounding
Energy content of reactants is higher than energy
content of products
Heat absorbed to break down the bond is lower than
heat released to form a bond
1
1
1
20
9
a.(i)
(ii)
b.
c.
1. Tomato puree is used as a colouring agent to restore the
colour of the food.
2. Sugar // spice is used as a flavouring agent to enhance
the taste of food
3. Permitted modified starch is used as thickener to thicken
food.
(Any two)
Advantage :
i) to prevent food from spoilage
ii) to improve appearance, texture or taste
Disadvantage:
i) Lead to serious diseases like asthma, and cancer
- Part A is hydrophobic: Soluble in oil or grease
- Part B is hydrophilic: Insoluble in oil or grease//soluble in
water
1. Hard water contain Mg2+ and Ca2+ ion
2. Detergent does not form scum in hard water
3. Soap form scum in hard water
4. Mg P
2+P and CaP
2+P in hard water react with soap
5. Soap molecule consist of hydrophobic and hydrophilic
part
6. Hydrophobic part dissolve in oil
7. Hydrophilic part dissolve in water
8. During scrubbing/rinsing the oily stains/spots is
2+2
1
1
1 + 1
1 + 1
1
1
1
1
1
1
1
1
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@ 2012 Hak Cipta MPSM Pahang [Lihat halaman sebelah SULIT
washed away
9. Cloth in experiment II /detergent is cleaner than cloth in experiment I
10. Detergent in hard water is more effective than soap.
1
1
20
10.
a.(i)
(ii)
b)
c)
The speed at which reactant are converted into product in a
chemical reaction// change in selected quantity of reactant or
produrt per unit of time taken.
Total surface area / concentration of reactant / temperature
of reactant / use of catalyst / pressure of gaseous reactant
(any 4)
To make the coffee powder and sugar dissolve easier in water. The heat given to the water will give more kinetic energy to the particles. The particles of water, coffee powder and sugar move faster. They will collide each other more frequent. The frequency of effective collision will increase.
Precipitate : Sulphur Materials:
0.2 mol dm P
-3P sodium thiosulphate, 1.0 mol dmP
-3P sulphuric
acid, a piece of white paper marked ‘X’ at the centre. Apparatus: 150 cmP
3P conical flask, stopwatch, 50 cmP
3P measuring cylinder,
10 cmP
3P measuring cylinder, thermometer, Bunsen burner,
wire gauze. Procedure:
Using a measuring cylinder, 50 cmP
3 Pof 0.2 mol dmP
-3P sodium
thiosulphate solution is measured and poured into a conical flask. The conical flask is placed on top of a piece of white paper marked ‘X’ at the centre.
1
1+1
1
1
1
1
1
1
1
1
1
1
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END OF MARKING SCHEME
5 cmP
3P of 1.0 mol dm P
-3P sulphuric acid is measured using
another measuring cylinder. The sulphuric acid is poured immediately and carefully into the conical flask. At the same time, the stop watch is atarted The mixture in a conical flask is swirled. The ‘X’ mark is observed vertically from the top of the conical flask through the solution. The stopwatch is stopped once the ‘X’ mark disappears from view. Step 1 – 7 are repeated using 50 cmP
3P of 0.2 mol dm P
-3P sodium
thiosulphate solution at 40 P
oPC, 50P
oPC, 60P
oPC by heating the
solution before 5 cm P
3P of sulphuric acid is added in.
(Max 8) Conclusion
The increase of temperature, increase the rate of reaction
1
1
1
1
1
1
1
20
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SULIT 4541/3/PP
@ 2012 Hak Cipta MPSM Pahang 1 [ Lihat halaman sebelah SULIT
4541/3/PP Peraturan Permarkahan Kimia Kertas 3 OKT/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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@ 2012 Hak Cipta MPSM Pahang 2 [ Lihat halaman sebelah SULIT
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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@ 2012 Hak Cipta MPSM Pahang 4 [ Lihat halaman sebelah SULIT
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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@ 2012 Hak Cipta MPSM Pahang 5 [ Lihat halaman sebelah SULIT
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 sebelah SULIT
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, ⁰C 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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@ 2012 Hak Cipta MPSM Pahang 7 [ Lihat halaman sebelah SULIT
I II III
Initial temperature 27⁰C 29 27⁰C
Highest temperature 53.0 57.0 59.0
Increase in temperature 26⁰C 28 32⁰C
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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@ 2012 Hak Cipta MPSM Pahang 8 [ Lihat halaman sebelah SULIT
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 4 Number of carbon atom
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@ 2012 Hak Cipta MPSM Pahang 9 [ Lihat halaman sebelah SULIT
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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@ 2012 Hak Cipta MPSM Pahang 10 [ Lihat halaman sebelah SULIT
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 are soluble 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 sebelah SULIT
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 salts insoluble 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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@ 2012 Hak Cipta MPSM Pahang 12 [ Lihat halaman sebelah SULIT
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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@ 2012 Hak Cipta MPSM Pahang 13 [ Lihat halaman sebelah SULIT
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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@ 2012 Hak Cipta MPSM Pahang 14 [ Lihat halaman sebelah SULIT
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
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