SKEMA MARKAH
PAT TING. 4 KIMIA KERTAS 3 (2017)
Question Mark Scheme 1(a) Able to state the voltmeter readings accurately with correct decimal place and unit.
Marks 3
Answer: W and Cu: 2.8 V X and Cu: 0.8 V Y and Cu: 1.4 V Z and Cu: 0.4 V Able to state at least three voltmeter readings accurately without unit or with unit but wrong decimal place.
2
Sample answer: W and Cu: 2.8 // 2.80 V X and Cu: 0.8 // 0.80 V Y and Cu: 1.4 // 1.40 V Z and Cu: 0.4 // 0.40 V
Question 1(b)
Able to state at least two values correctly without unit
1
No response or wrong response
0
Mark Scheme Able to construct a table to record the voltmeter reading for each pair of metals that contain:
Marks 3
1. Correct titles with unit 2. Correct readings Sample answer: Pairs of metals Pasangan logam W and Cu X and Cu Y and Cu Z and Cu
Voltage // Voltmeter reading / V Voltan // Bacaan voltmeter /V 2.8 0.8 1.4 0.4
Able to construct a less accurate table that contains: 1. Titles without unit 2. At least two correct readings
2
Able to construct a table with at least one title and one reading
1
No response or wrong response
0 1
SKEMA MARKAH
PAT TING. 4 KIMIA KERTAS 3 (2017)
Question Mark Scheme 1(c) Able to state all the correct observations and inferences Sample answer: After 20 minutes Selepas 20 minit
Observation Pemerhatian Electrode dissolves / becomes thinner Elektrod larut / menjadi nipis r: corrodes / erodes / terkakis / tehakis
Inference Inferens The metal atoms release / donate electron to form ions Atom logam melepaskan / menderma elektron membentuk ion
At the positive terminal Pada terminal positif
Electrode becomes thicker Elektrod menebal // Brown solid is deposited Pepejal perang terenap
The copper(II) ions accept electrons to form copper atoms Ion kuprum(II) menerima elektron untuk menghasilkan atom kuprum
Copper(II) sulphate solution Larutan kuprum(II) sulfat
Intensity of blue solution decreases Keamatan larutan biru berkurang // Blue solution turns pale blue Larutan biru menjadi pudar
Concentration of Cu2+ ions decreases Kepekatan ion Cu2+ berkurang // Cu2+ ions are discharged to form copper atoms Cu2+ dinyahcas untuk menghasilkan atom kuprum
At the negative terminal Pada terminal negatif
Marks 6
Able to state any five correct observations and its inferences
5
Able to state any four correct observations and its inferences
4
Able to state any three correct observations and its inferences
3
Able to state any two correct observations and its inferences
2
Able to state any one correct observation and its inference
1
No response or wrong response
0
2
SKEMA MARKAH
Question 1(d)
PAT TING. 4 KIMIA KERTAS 3 (2017)
Mark Scheme Able to state all three variables correctly
Marks 3
Sample answer: Manipulated: Pairs of metals // Negative terminal Pasangan logam // Terminal negatif Responding: Voltmeter reading // Voltage // Potential difference Bacaan voltmeter // Voltan // Beza keupayaan Fixed: Copper electrode // Positive terminal // Copper(II) sulphate solution Elektrod kuprum // Terminal positif // Larutan kuprum(II) sulfat Able to state any two variables correctly
2
Able to state any one variable correctly
1
No response or wrong response
0
Question Mark Scheme 1(e) Able to state the relationship between manipulated variable and the responding variable with direction.
Marks 3
Sample answer: The further the distance between two metals in the electrochemical series, the bigger the voltage. Semakin jauh jarak antara dua logam dalam siri elektrokimia, semakin besar nilai voltan // When W and Cu pair of metals are used, the voltmeter reading is highest. When Z and Cu pair of metals are used, the voltmeter reading is lowest. Apabila pasangan logam W dan Cu digunakan, bacaan voltmeter paling tinggi. Apabila pasangan logam Z dan Cu digunakan, bacaan voltmeter paling rendah. Able to state the relationship between manipulated variable and the responding variable.
2
Sample answer: The further the distance between two metals, the bigger the voltage Semakin jauh jarak antara dua logam, semakin besar nilai voltan // 3
SKEMA MARKAH
PAT TING. 4 KIMIA KERTAS 3 (2017)
Different pair of metals have different voltage values Pasangan logam berlainan mempunyai nilai voltan yang berbeza Able to state the idea of hypothesis
1
Sample answer: Pair of different metals shows voltmeter reading Pasangan logam yang berbeza menunjukkan bacaan voltmeter No response or wrong response Question Mark Scheme 1(f) Able to arrange in ascending order of all metals
0 Marks 3
Answer: Cu, Z, X, Y, W Able to arrange any four metals in correct ascending order
2
Able to arrange any three metals in correct ascending order // Able to arrange in descending order of all metals W, Y, X, Z, Cu
1
No response or wrong response
0
Question Mark Scheme 1(g) Able to state the correct operational definition for voltage correctly.
Marks 3
Sample answer: Voltage is the voltmeter reading when two metals are dipped in the copper(II) sulphate solution. Voltan ialah bacaan voltmeter apabila dua logam berbeza dicelup di dalam larutan kuprum(II) sulfat. Able to state the correct operational definition for voltage less accurately
2
Sample answer: Voltage is the voltmeter reading when two different metals are used Nilai voltan ialah bacaan voltmeter apabila dua logam berbeza digunakan
4
SKEMA MARKAH
PAT TING. 4 KIMIA KERTAS 3 (2017)
Able to state the idea of voltage
1
Sample answer: The voltage is influenced by the position of metals // Different metals show different voltmeter reading Voltan dipengaruhi oleh kedudukan logam // Logam yang berbeza menunjukkan bacaan voltmeter yang berbeza. No response or wrong response
Question 1(h)
Mark Scheme Able to predict the three positive terminals and three voltages for all pairs of metals correctly.
0
Marks 6
Sample answer: Pair of metals Positive terminal Voltage / V Pasangan logam Terminal positif Voltan / V W and X X 2.0 W dan X X and Y X 0.6 X dan Y W and Z Z 2.4 W dan Z Able to state any five correct positive terminals and voltage
5
Able to state any four correct positive terminals and voltage
4
Able to state any three correct positive terminals and voltage
3
Able to state any two correct positive terminals and voltage
2
Able to state any one correct positive terminals and voltage
1
No response or wrong response
0
5
SKEMA MARKAH
PAT TING. 4 KIMIA KERTAS 3 (2017)
Question Mark Scheme 1(i) Able to classify all the four substances correctly Electrolyte Elektrolit Sodium chloride solution Dilute sulphuric acid
Marks 3
Non-electrolyte Bukan elektrolit Glucose solution Glacial ethanoic acid
Able classify any three substances correctly
2
Able classify any two substances correctly
1
No response or wrong response
0
Question Mark Scheme 2(a) Able to state the problem statement correctly
Marks 3
Sample answer: Is brass harder than copper? Adakah loyang lebih keras daripada kuprum?// Is alloy harder than its pure metal? Adakah aloi lebih keras berbanding logam tulen? Able to state the problem statement / aim
2
Sample answer: To compare the hardness of pure metal / copper and its alloy / brass. Untuk membandingkan kekerasan logam tulen / kuprum dan aloinya / loyang. a: Is alloy / brass stronger than pure metal / copper? Able to state an idea of the problem statement
1
Sample answer: Alloy is hard Aloi keras No response given or wrong response
0
6
SKEMA MARKAH
PAT TING. 4 KIMIA KERTAS 3 (2017)
Question Mark Scheme 2(b) Able to state all the variables correctly
Marks
Sample answer: Manipulated: copper and brass // types of block kuprum dan loyang // jenis blok Responding: diameter of dent // hardness of copper and brass Diameter lekuk // kekerasan kuprum dan loyang
3
Fixed: stainless steel ball // mass of weight // height of weight bola keluli // jisim pemberat // tinggi pemberat Able to state any two variables correctly Able to state any one variable correctly No response given or wrong response
Question Mark Scheme 2(c) Able to state the relationship between the manipulated variable and the responding variable with direction correctly
2 1 0
Marks 3
Sample answer: Brass is harder than copper Loyang lebih keras berbanding kuprum // Brass / alloy produces a smaller diameter of dent compared to copper / pure metal Loyang menghasilkan diameter lekuk yang lebih kecil berbanding kuprum / logam tulen Able to state the relationship between the manipulated variable and the responding variable with direction but less correctly.
2
Sample answer: Hardness of brass is higher Kekerasan Loyang lebih tinggi Able to give an idea of hypothesis
1
Sample answer: Brass is hard Loyang keras
7
SKEMA MARKAH
PAT TING. 4 KIMIA KERTAS 3 (2017)
No response given or wrong response
0
Question Mark Scheme 2(d) Able to list materials and apparatus completely Sample answer: 1. Copper block Blok kuprum 2. Brass block Blok loyang 3. Stainless steel ball Bola keluli 4. Cellophane tape Pita selofan 5. Thread Benang 6. Ruler Pembaris 7. 1 kg weight Pemberat 1 kg 8. Retort stand with clamps Kaki retort dan pengapit
Marks 3
Able to list materials and apparatus Sample answer: 1. Copper block Blok kuprum 2. Brass block Blok loyang 3. Stainless steel ball Bola keluli 5. Thread Benang 6. Ruler Pembaris 7. 1 kg weight Pemberat 1 kg
2
Able to give an idea of materials and apparatus Sample answer: 1. Copper block / Brass block Blok kuprum / Blok loyang 3. Stainless steel ball Bola keluli 7. 1 kg weight
1
8
SKEMA MARKAH
PAT TING. 4 KIMIA KERTAS 3 (2017)
Pemberat 1 kg No response given or wrong response
Question Mark Scheme 2(e) Able to state all steps of procedure correctly
0
Marks 3
Sample answer: 1. Stick the stainless ball bearing on the brass block with cellophane tape Lekatkan bola keluli pada blok loyang menggunakan pita selofan 2. Hang the 1 kg weight at a height 50 cm above the brass block Gantung pemberat 1 kg pada ketinggian 50 cm di atas blok loyang 3. Release the weight Lepaskan pemberat 4. Measure and record the diameter of the dent Ukur dan rekod diameter lekuk 5. Repeat the experiment using the copper block to replace the brass block. Ulang eksperimen menggunakan blok kuprum bagi menggantikan blok loyang Able to state steps 1, 3, 4 and 5
2
Able to state steps 1, 3 and 4
1
No response given or wrong response
0
Question Mark Scheme 2(f) Able to construct a table that consists of: 1. Headings for manipulated and responding variables 2. Example of material / block
Marks 2
Sample answer: Material / Block Bahan / Blok Brass Loyang
Diameter of dent (cm) Diameter lekuk (cm)
9
SKEMA MARKAH
PAT TING. 4 KIMIA KERTAS 3 (2017)
Copper Kuprum Able to construct a table that consists of: 1. Headings for manipulated and responding variables
1
Sample answer: Material / Block Bahan / Blok
Diameter of dent (cm) Diameter lekuk (cm)
No response given or wrong response
0
END OF MARK SCHEME SKEMA MARKAH TAMAT
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......................................................... (CIK INTAN ZAREENA ZAHEDI) Guru Mata Pelajaran
......................................................... (PN. NORHUSNA BINTI AZLAN) Guru Mata Pelajaran
................................................. (PN. NORLIZA MD DERUS) Guru Kanan Sains
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