8/13/2019 2010 Skema Pat Sbp
1/17
CHEMISTRY
MARKING SCHEME
PAPER 1PAPER 2
PAPER 3
Peraturan Pemarkahan
4541
Chemistry
Oktober
2010
BAHAGIAN PENGURUSAN
SEKOLAH BERASRAMA PENUH DAN SEKOLAH KECEMERLANGAN
KEMENTERIAN PELAJARAN MALAYSIA
PEPERIKSAAN SELARAS AKHIR TAHUN
TINGKATAN 4 TAHUN 2010
Kertas soalan ini mengandungi 16halaman bercetak
8/13/2019 2010 Skema Pat Sbp
2/17
SULIT Peperiksaan Selaras Akhir Tahun Tingkatan 4
4541 2010 Hak Cipta Sekolah Berasrama Penuh
SULIT
Paper 1
1 A 21 B 41 D
2 B 22 C 42 D3 A 23 A 43 A
4 D 24 B 44 A
5 B 25 B 45 D
6 D 26 C 46 A
7 B 27 A 47 B
8 A 28 D 48 B
9 D 29 C 49 A
10 B 30 D 50 D
11 C 31 B
12 A 32 C13 B 33 B
14 C 34 A
15 D 35 C
16 C 36 A
17 A 37 A
18 C 38 B
19 B 39 D
20 D 40 A
8/13/2019 2010 Skema Pat Sbp
3/17
SULIT Peperiksaan Selaras Akhir Tahun Tingkatan 4
4541 2010 Hak Cipta Sekolah Berasrama Penuh
SULIT
Paper 2
1 Rubric Score
(a) (i) 19 1
(ii) 18 1
(iii) 2.8.7 1
(iv) V and X
Both atoms V and X have the same proton number but different nucleon number
1
1
(b) (i)
R S
1 + 1
(ii) [mark freezing point on the graph & label]
Heat released to the surrounding is equal to the
Heat released as the particles attract one another to form a solid
1
1
1
10
Temperature (oC)
Time(s)
t1 t2
Freezing point
8/13/2019 2010 Skema Pat Sbp
4/17
SULIT Peperiksaan Selaras Akhir Tahun Tingkatan 4
4541 2010 Hak Cipta Sekolah Berasrama Penuh
SULIT
2 Rubric Score
(a) Period 3; Group 13 1 + 1
(b) Atom W has stable octet electron arrangement 1
(c) (i) S 1(ii) [state either onespecial characteristics of transition elements]
Show different oxidation number Formed colour ions or compounds. Are useful catalysts Formed complex ion
1
(d) V, U, P 1
(e) (i) R 1
(ii) R has bigger atomic size than Q//the valence electron is further away from
nucleus R than Q
Nuclei attraction of R towards valence electron is weaker than Q//Atom R iseasier to donate its valence electron
1
1
(f) [mark correct position of element M]
P U M V
Q T W
R S
1
10
3 Rubric Score
(a) (i) Anion is negatively-charged ion 1
(ii) Cl-, OH- 1
(b) Electricity energychemical energy 1
(c) (i) X 1
(ii) 2H++ 2e-H2 1
(iii) Bring a lighted wooden splinter to the mouth of the test tube Popsound is heard 11
(d) (i) iodine 1
(ii) Concentration of I-is higher than OH-
I-is selectively discharged to produce iodine
1
1
10
8/13/2019 2010 Skema Pat Sbp
5/17
SULIT Peperiksaan Selaras Akhir Tahun Tingkatan 4
4541 2010 Hak Cipta Sekolah Berasrama Penuh
SULIT
4 Rubric Score
(a) (i) Blue to red 1
(ii) H+ 1
(b) No
No presence of H+ion//ethanoic acid exist as a neutral molecule
1
1
(c) Ethanoic acid has higher pH value than hydrochloric acid
Ethanoic acid is weak acid and hydrochloric acid is strong acid//ethanoic acid ionises
partially in water and hydrochloric acid ionises completely in water
Concentration of H+in ethanoic acid is lower than hydrochloric acid
1
1
1
(d) (i) Effervescence occurs//bubbles of colourless gas is released. 1
(ii) [correct formula of reactant & product]
[balanced chemical equation]
CaCO3+ 2 HClCaCl2+ CO2+ H2O
1
1
10
5 Rubric Score
(a) (i) neutralisation 1
(ii) Pink to colourless 1
(ii) Number of moles of NaOH =
Number of moles of HCl = 0.005
Molarity of HCl =
or
1
1
or
1
1(b) (i) [correct formula of reactant & product]
[balanced chemical equation]
Pb(NO3)2 + 2KClPbCl2+ 2KNO3
1
1
(ii) Filter the mixture 1
(iii) Number of moles of lead nitrate =
1
(iv) 1 mol of lead nitrate produce 1 mol of PbCl2
0.01 mol of lead nitrate produce 0.01 mol of PbCl2
Mass of precipitate =
1
1
10
8/13/2019 2010 Skema Pat Sbp
6/17
SULIT Peperiksaan Selaras Akhir Tahun Tingkatan 4
4541 2010 Hak Cipta Sekolah Berasrama Penuh
SULIT
6 Rubric Score
(a) (i) Contact process 1
(ii) [state any two materials]
Sulphur, air, water
1 + 1
(iii) Gas dissolved in rain water
To form acid rain
1
1
(b) (i) [correct formula of reactant & product]
[balanced chemical equation]
N2+ 3 H2 3NH3
1
1
(ii) iron 1
( c) (i) Ammonium sulphate 1
(ii) [state any one use of sulphuric acid]
as electrolyte in lead-acid accumulator
manufacture of detergent/paint
1
10
8/13/2019 2010 Skema Pat Sbp
7/17
SULIT Peperiksaan Selaras Akhir Tahun Tingkatan 4
4541 2010 Hak Cipta Sekolah Berasrama Penuh
SULIT
7 Rubric Score
(a) Electron arrangement of R : 2.8.7Electron arrangement of Q : 2.8.8.2Atom Q has 2 valence electrons and 3 shells occupied with electrons.Q is located in Group 2 and Period 4.
1
1
1+ 1
1+ 1
61. Atom Q losses 2 electron2. to achieve the stable octet electron arrangement3. Q2+ion is formed4. Two atoms R, each receives 1 electron from atom Q to achieve the stable octet electron
arrangement
5. Two Rions are formed.6. An ion Q2+and two ion R-are attracted together by strong electrostatic forces7. A compound with formula, QR2is formed.
1
1
1
1
1
1
1
7
(c) CR4
[sharing 4 pairs of electron between C atom and R atom][electron arrangement of all atoms]
1
1
1
3
Melting pointCompound (b) has high melting point
compound (c) has low melting point.
Electrical conductivityCompound (b) can conduct electricity in liquid or aqueous solution state.Compound (c) can not conduct electricity in any state.
1
1
1
1
4
20
C
R
R
R
R
8/13/2019 2010 Skema Pat Sbp
8/17
SULIT Peperiksaan Selaras Akhir Tahun Tingkatan 4
4541 2010 Hak Cipta Sekolah Berasrama Penuh
SULIT
8 Rubric Score
(a) (i) Pass dry hydrogen gas to remove the air in the combustion tube before heating lead
oxide.
To avoid explosion.
1
1
2(ii) [correct formula of reactant & product]
[balanced chemical equation]
PbO + H2Pb + H2O
1
1
2
(b) [Procedure]
1. Clean magnesium ribbon with sand paper2. Weigh crucible and its lid3. Put magnesium ribbon into the crucible and weigh the crucible with its lid4. Heat strongly the crucible without its lid5. Cover the crucible when the magnesium starts to burn and lift/raise the lid a little at
intervals6. Remove the lid when the magnesium burnt completely7. Heat strongly the crucible for a few minutes8. Cool and weigh the crucible with its lid and the content9. Repeat the processes of heating, cooling and weighing until a constant mass is
obtained
Results:
Mass/g
Crucible + lid xCrucible + lid + magnesium y
Crucible + lid + magnesium oxide z
Calculations
Empirical formula: MgaOb/ MgO
Element Mg O
Mass (g) y-x z-y
Number of moles24
xy
16
yz
Simplest ratio of moles a b
1
1
1
1
1
1
1
Max:7
1
1
1
111
(c) Both empirical formula and molecular formula shows glucose is made up of carbon and
hydrogen
empirical formula tell the simplest ratio of carbon atom to hydrogen atoms,
= 1: 2 : 1
Molecular formula shows the actual number of carbon atoms and hydrogen atoms in its
molecule.
Each glucose molecule consist of 6 carbon atoms, 12 hydrogen atoms and 6 oxygen
atom
1
1
1
1
1
5
20
8/13/2019 2010 Skema Pat Sbp
9/17
SULIT Peperiksaan Selaras Akhir Tahun Tingkatan 4
4541 2010 Hak Cipta Sekolah Berasrama Penuh
SULIT
9 Rubric Score
(a) Salt is an ionic compound
where hydrogen ion from the acid is replaced by metal ions/ammonium ion.
1
1
2
(b) (i) Soluble salts : zinc sulphate, copper (II) sulphateInsoluble salts: lead(II) sulphate, calcium sulphate
1 + 11+ 1
4
(ii) Sulphuric acid
Zinc/zinc oxide/zinc carbonate or
copper(II) oxide/copper(II) carbonate
1
1
2
(c) 1. Pour 50 cm of 2 mol dm- sulphuric acid into a beaker.[Volume: 20 100 cm
3, molarity: 0.5 2.0 mol dm-3]
2. Warm the acid.3. Use a spatula to add copper oxide/zinc oxide powder [or any
suitable reactant] into the acid.
4. Stir the mixture evenly.5. Continue adding copper oxide [or any suitable
reactant] until some of it no longer dissolves.
6. Filter to remove the excess copper oxide[or any suitablereactant].
7. Pour the filtrate into an evaporating dish and heat the saltsolution to produce a saturated solution.
8. Cool the saturated solution until crystals are formed.9. The content are filtered to obtain the sulphate
crystals.
10.The crystals are dried by pressing between filter paperspaper
11.Correct formula of reactant & product12.Balanced chemical equation.
1
1
1
1
1
1
1
1
1
1
1
1
12
20
8/13/2019 2010 Skema Pat Sbp
10/17
SULIT Peperiksaan Selaras Akhir Tahun Tingkatan 4
4541 2010 Hak Cipta Sekolah Berasrama Penuh
SULIT
10 Rubric Score
(a) [functional diagram]
[label iron key as the cathode]
[label suitable metal as the anode]
[label suitable electrolyte]
Example:
1
1
1
1
4
(b) (i) Q : Copper
Copper is more electropositive than silver
Copper can displace silver from silver nitrate solution
Produce silver
Copper(II) ion
1
1
1
1
1
5
(ii) P, Q/Cu, Ag 1
1
(c) R : zinc/any metal which is more electropositive than copper
Negative terminal : zinc
Positive terminal : copperZinc ionises/release electrons
Electrons flow from negative terminal to positive terminal through external circuit
Copper(II) ion is discharged at postitive terminal
Half equation:
Negative terminal : ZnZn2++ 2e-
Positive terminal : Cu2++ 2e-Cu
Observation:
Negative terminal: zinc become smaller
Positive terminal: copper become bigger/brown solid deposited
1
1
11
1
1
1
1
1
1
10
8/13/2019 2010 Skema Pat Sbp
11/17
SULIT Peperiksaan Selaras Akhir Tahun Tingkatan 4
4541 2010 Hak Cipta Sekolah Berasrama Penuh
SULIT
Paper 3
Question 1(a)
Rubric Score
Able to record the observation correctly.
Sample answer:
Potassium burns more vigorously and produces white fumes.
3
Able to record the observation less correctly.
Sample answer:
Potassium burns vigorously and produces white fumes.
2
Able to state an idea of the observation.
Sample answer
Potassium burns in oxygen/produces white fumes.
1
No response or wrong response 0
Question 1(b)
Rubric Score
Able to state the three variables and controlling the three variables correctly
Sample answer:
Variable Action to be taken
(i) Manipulated VariableType of alkalimetals//lithium, sodium,
potassium
(i) Method to manipulate the variableReplace lithium with sodium and potassium
(ii) Responding Variable
Reactivity towards
oxygen
(ii) What to observe in the responding variableBurning of alkali metals in oxygen gas
(iii) Fixed Variable:
Size of alkali metals
(iii)Method to maintain the fixed variableRepeat the experiment with the same size of
alkali metals
6
Able to give any 5 statements correctly 5
Able to give any 4 statements correctly 4
Able to give any 3 statements correctly 3
Able to give any 2 statements correctly 2
Able to give any 1 statements correctly 1
No response or wrong response 0
8/13/2019 2010 Skema Pat Sbp
12/17
SULIT Peperiksaan Selaras Akhir Tahun Tingkatan 4
4541 2010 Hak Cipta Sekolah Berasrama Penuh
SULIT
Question 1(c)
Rubric Score
Able to state the hypothesis accurately
Sample answer:
The lower position of alkali metals in Group 1, the more reactive the metals towardsoxygen
3
Able to record the hypothesis less correctly.
Sample answer:
Reactivity towards oxygen increases when going down Group 1 Potassium is more reactive than sodium and lithium towards oxygen.
2
Able to state an idea of hypothesis.
Sample answer
Metals burns in oxygen.
1
No response or wrong response 0
Question 1(d)
Rubric Score
Able to state two inferences accurately
Sample answer:
Sodium react with oxygen Produce sodium oxide
3
Able to state at least one inference.
Sample answer:
Sodium burns in oxygen form sodium oxide
2
Able to state an idea of inference.
Sample answer
Reaction occurs
1
No response or wrong response 0
8/13/2019 2010 Skema Pat Sbp
13/17
SULIT Peperiksaan Selaras Akhir Tahun Tingkatan 4
4541 2010 Hak Cipta Sekolah Berasrama Penuh
SULIT
Question 1(e)
Rubric Score
Able to state operational definition accurately
Sample answer:
The burning of metals when is alkali metals is burnt in oxygen gas
3
Able to state operational definition less accurately
Sample answer:
Burning of metals in oxygen gas
2
Able to state an idea of operational definition.
Sample answer
Reaction with oxygen gas
1
No response or wrong response 0
Question 2(a)
Rubric Score
[Able to write all the volumes with units accurately]
Initial burette readings: 0.80 cm3, 13.40 cm3, 25.90 cm3
Final burette readings : 13.40 cm3, 25.90 cm3, 38.40 cm3
3
[Able to record all the volumes accurately but without units one decimal place]
Initial burette readings: 0.8, 13.4, 25.9
Final burette readings : 13.4, 25.9, 38.4
2
[Able to write at least four readings of the volumes accurately] 1
No response or wrong response 0
Question 2(b)
Rubric Score
[Able to construct a table correctly containing three labeled columns with correct
units and record all the burette readings and volume of acids used accurately ]
Suggested answer:Titration No. I II II
Initial burette
reading/cm3
0.80 13.40 25.90
Final burette
reading/cm3
13.40 25.90 38.40
Volume of acid
used/cm3
12.60 12.50 12.50
3
[Able to construct a table correctly containing three labeled columns without
units/one decimal place and record all the volumes accurately]
2
[Able to construct a table with at least three labels and four correct readings] 1
No response given / wrong response 0
8/13/2019 2010 Skema Pat Sbp
14/17
SULIT Peperiksaan Selaras Akhir Tahun Tingkatan 4
4541 2010 Hak Cipta Sekolah Berasrama Penuh
SULIT
Question 2(c)
Rubric Score
[Able to calculate the average volume of acid used correctly and with unit]
Suggested answer:
Volume of acid used = 12.60 + 12.50 + 12.503
= 12.53 cm3
3
[Able to calculate the average volume correctly but without unit.] 2
[Able to show the calculation of average volume of acid used but incorrect answer] 1
No response or wrong response 0
Question 2(d)
Rubric Score
[Able to state the volume correctly]
6.25 cm3
3
[Able to state the volume but to one decimal place]
6.3 cm3// [6.0 7.0] cm3
2
[Able to state the volume but inaccurately]
12.5 cm3//25.0 cm3
1
No response or wrong response 0
Question 2(e)
Rubric Score
[Able to classify the strong acids and the weak acids into their group the correctly]
Strong acids: hydrochloric acid, sulphuric acid, nitric acid
Weak acids: ethanoic acid, carbonic acid
3
[Able to calssify at least three acids correctly]
Strong acids: ethanoic acid, carbonic acid
Weak acids: hydrochloric acid, sulphuric acid, nitric acid
2
[Able to classify at least any two acids correctly] 1
No response or wrong response 0
8/13/2019 2010 Skema Pat Sbp
15/17
SULIT Peperiksaan Selaras Akhir Tahun Tingkatan 4
4541 2010 Hak Cipta Sekolah Berasrama Penuh
SULIT
Question 3(a)
Rubric Score
[Able to state the problem statement accurately]
Sample answer:How does the distance between two metals in the electrochemical series affect the
voltmeter reading in a voltaic cell?
3
[Able to state the problem statement accurately]
Sample answer:
How does the position of metals in the electrochemical series affect volmeterreading?
To construct electrochemical series bases on the volmeter reading in a voltaic cell
2
[able to show an idea of problem statement]
Sample answer
How does pairs of metals affect volmeter reading?
1
No response or wrong response 0
Question 3(b)
Rubric Score
[Able to state three variables accurately]
Sample answer:
Manipulated variables: pairs of metalsResponding variables : voltmeter reading
Fixed variable: type of electrolyte
3
[Able to state two variables accurately] 2
[Able to state one variable] 1
No response or wrong response 0
8/13/2019 2010 Skema Pat Sbp
16/17
SULIT Peperiksaan Selaras Akhir Tahun Tingkatan 4
4541 2010 Hak Cipta Sekolah Berasrama Penuh
SULIT
Question 3(c)
Rubric Score
[Able to state the relationship between manipulated variable and responding
accurately]
Sample answer:
The further the two metals in the electrochemical series, the higher the voltmeterreading
The distance between two metals in electrochemical series become greater, thegreater the voltmeter reading
3
[Able to state hypothesis less accurately]
Sample answer:
The higher the voltmeter reading, the further the two metals in theelectrochemical series
2
[Able to show an idea of hypothesis]
Sample answer:
The metals affect the voltmeter reading
1
No response or wrong response 0
Question 3(d)
Rubric Score[Able to state materials & apparatus accurately]
Suggested answer:
Materials : copper strips, P, Q and R strips; copper(II) sulphate solution[any suitable
electrolyte]
Apparatus : voltmeter, beaker, sand paper and connecting wires
3
[Able to state materials & apparatus less accurately]
Sample answer:Materials : copper, P, Q, R; copper(II) sulphate solution
Apparatus : voltmeter, beaker
2
[Able to show an idea of materials and apparatus]
Sample answer:
Materials : copper, P/Q/R; copper(II) sulphate solution
Apparatus : voltmeter
1
No response or wrong response 0
8/13/2019 2010 Skema Pat Sbp
17/17
SULIT Peperiksaan Selaras Akhir Tahun Tingkatan 4
4541 2010 Hak Cipta Sekolah Berasrama Penuh
SULIT
Question 3(e)
Rubric Score
[Able to state the procedures accurately]
Suggested answer:1. A beaker is filled with copper (II) sulphate solution.
2. The copper and P strips are cleaned with sand paper.
3. The strips are immersed into the solution and connected by wires
to a voltmeter.
4. The reading of the voltmeter is recorded.
5. Steps 1 - 4 are repeated with replacing P with Q and R.
3
[Able to state the procedure less accurately]
Sample answer:
1. The metal strips are immersed into the solution and connected by wires to avoltmeter.
2. The reading of the voltmeter is recorded.3. Steps 1 - 4 are repeated with replacing P with Q and R.
2
[Able to show an idea of procedures]
Sample answer:
1. The metals immersed into the solution2. The reading of the voltmeter is recorded.
1
No response or wrong response 0
Question 3(f)
Rubric Score
[Able to show construct table with correct heading and units and state all the pairs of
metals]
Suggested answer:Pair of metals Volmeter reading/V
P - Cu
Q - CuR - Cu
.
2
[Able to show construct table with heading and without units]
Sample answer:Pair of metals Volmeter reading
1
No response or wrong response 0End of Answer Scheme
Top Related